/* =====================================================
   APUNTES UNAM 2026 — styles.css
   ===================================================== */

/* --- Variables de Diseño --- */
:root {
    --bg-color: #f4f6f8;
    --text-color: #334155;
    --main-node: #ffe4b5;
    --branch-1: #bae1ff;
    --branch-2: #baffc9;
    --branch-3: #ffb38a;
    --branch-4: #e2cbff;
    --branch-5: #fce7f3;
    --sub-node-bg: #ffffff;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 25px;
    --menu-bg: #ffffff;
    --menu-text: #1e293b;
    --menu-hover: #e2e8f0;
    --menu-accent: #2563eb;
    --card-text: #475569;
    --header-text: #1e293b;
    --input-bg: #ffffff;
    --transition-smooth: 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body.dark-mode {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --main-node: #78350f;
    --branch-1: #1e3a8a;
    --branch-2: #064e3b;
    --branch-3: #7c2d12;
    --branch-4: #4c1d95;
    --branch-5: #831843;
    --sub-node-bg: #1e293b;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    --menu-bg: #1e293b;
    --menu-text: #f1f5f9;
    --menu-hover: #334155;
    --card-text: #cbd5e1;
    --header-text: #f8fafc;
}

/* --- Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: 'Nunito', sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(#cbd5e1 2px, transparent 2px);
    background-size: 30px 30px;
    color: var(--text-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    background-image: radial-gradient(#334155 2px, transparent 2px);
}

/* --- Estructura de Páginas --- */
.subject-content {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: center;
    padding: 20px 20px 60px 20px;
    box-sizing: border-box;
}

.subject-content.visible {
    display: flex;
}

/* La página de inicio maneja su propio padding en .home-container */
#content-home {
    padding: 0;
}

/* --- Botones Flotantes --- */
.dark-mode-toggle,
.menu-btn {
    position: fixed;
    z-index: 1050;
    background: var(--menu-bg);
    border: none;
    cursor: pointer;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.12);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.menu-btn {
    top: 20px;
    left: 20px;
    flex-direction: column;
    gap: 5px;
    padding: 12px;
}

.dark-mode-toggle {
    top: 20px;
    right: 20px;
    font-size: 1.5rem;
    color: var(--menu-accent);
}

.dark-mode-toggle:hover {
    transform: rotate(30deg) scale(1.1);
}

.menu-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    border-radius: 5px;
    transition: all 0.4s ease;
}

.menu-btn.open .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-btn.open .bar:nth-child(2) {
    opacity: 0;
}

.menu-btn.open .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* --- Floating Action Buttons Column --- */
.floating-actions-row {
    position: fixed;
    bottom: 24px;
    right: 20px;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    pointer-events: none;
}
.floating-actions-row > * {
    pointer-events: auto;
}

.fab-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
    transition: all 0.25s ease;
    flex-shrink: 0;
}
.fab-circle:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

#scrollToTopBtn {
    background: var(--menu-accent);
    display: none;
    animation: fadeInPage 0.3s ease;
}
#scrollToTopBtn.visible {
    display: flex;
}

/* --- Botón Instalar PWA (inside floating column) --- */
#pwa-install-btn {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    display: none;
}
#pwa-install-btn.fab-visible {
    display: flex;
}
#pwa-install-btn.hidden-scroll {
    display: none;
}

/* --- Menú Lateral --- */
.side-menu {
    position: fixed;
    top: 0;
    left: -330px;
    width: 320px;
    height: 100vh;
    height: 100dvh;
    background-color: var(--menu-bg);
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.1);
    z-index: 999;
    transition: left var(--transition-smooth);
    display: flex;
    flex-direction: column;
    padding-top: 80px;
    padding-bottom: 90px;
    box-sizing: border-box;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.side-menu.open {
    left: 0;
}

.side-menu h3 {
    margin: 0 20px 12px 20px;
    font-size: 1.5rem;
    color: var(--menu-accent);
    border-bottom: 2px solid var(--menu-hover);
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu-category-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #64748b;
    font-weight: 800;
    padding: 15px 25px 8px 25px;
    margin-top: 10px;
}

.dark-mode .menu-category-title {
    color: #94a3b8;
}

/* --- Colores de Menú en Modo Oscuro (Override de los estilos en línea) --- */
.dark-mode #btn-espanol {
    color: #60a5fa !important;
}

.dark-mode #btn-matematicas {
    color: #a78bfa !important;
}

.dark-mode #btn-fisica {
    color: #22d3ee !important;
}

.dark-mode #btn-quimica {
    color: #4ade80 !important;
}

.dark-mode #btn-biologia {
    color: #fbbf24 !important;
}

.dark-mode #btn-hist-univ {
    color: #f87171 !important;
}

.dark-mode #btn-historia {
    color: #fb923c !important;
}

.dark-mode #btn-literatura {
    color: #c084fc !important;
}

.dark-mode #btn-geografia {
    color: #2dd4bf !important;
}

.dark-mode #btn-todas-unam {
    color: #fb923c !important;
}

.dark-mode #btn-simulacro {
    color: #60a5fa !important;
}

.dark-mode #btn-guided {
    color: #2dd4bf !important;
}

.dark-mode #link-flashcards {
    color: #c084fc !important;
}

.dark-mode #link-studytok {
    color: #fb7185 !important;
}

.dark-mode #link-stats {
    color: #f87171 !important;
}

/* Menú en Modo Oscuro - Sombreados Active */
.dark-mode #btn-espanol.active {
    background-color: rgba(96, 165, 250, 0.15) !important;
    border-left-color: #60a5fa !important;
    color: #93c5fd !important;
}

.dark-mode #btn-matematicas.active {
    background-color: rgba(167, 139, 250, 0.15) !important;
    border-left-color: #a78bfa !important;
    color: #c4b5fd !important;
}

.dark-mode #btn-quimica.active {
    background-color: rgba(74, 222, 128, 0.15) !important;
    border-left-color: #4ade80 !important;
    color: #86efac !important;
}

.dark-mode #btn-fisica.active {
    background-color: rgba(34, 211, 238, 0.15) !important;
    border-left-color: #22d3ee !important;
    color: #67e8f9 !important;
}

.dark-mode #btn-biologia.active {
    background-color: rgba(251, 191, 36, 0.15) !important;
    border-left-color: #fbbf24 !important;
    color: #fcd34d !important;
}

.dark-mode #btn-hist-univ.active {
    background-color: rgba(248, 113, 113, 0.15) !important;
    border-left-color: #f87171 !important;
    color: #fca5a5 !important;
}

.dark-mode #btn-historia.active {
    background-color: rgba(251, 146, 60, 0.15) !important;
    border-left-color: #fb923c !important;
    color: #fdba74 !important;
}

.dark-mode #btn-literatura.active {
    background-color: rgba(192, 132, 252, 0.15) !important;
    border-left-color: #c084fc !important;
    color: #d8b4fe !important;
}

.dark-mode #btn-geografia.active {
    background-color: rgba(45, 212, 191, 0.15) !important;
    border-left-color: #2dd4bf !important;
    color: #5eead4 !important;
}

.dark-mode #btn-todas-unam.active {
    background-color: rgba(251, 146, 60, 0.15) !important;
    border-left-color: #fb923c !important;
    color: #fdba74 !important;
}

.dark-mode #btn-simulacro.active {
    background-color: rgba(96, 165, 250, 0.15) !important;
    border-left-color: #60a5fa !important;
    color: #93c5fd !important;
}

.dark-mode #btn-guided.active {
    background-color: rgba(45, 212, 191, 0.15) !important;
    border-left-color: #2dd4bf !important;
    color: #5eead4 !important;
}

.dark-mode #link-flashcards.active {
    background-color: rgba(192, 132, 252, 0.15) !important;
    border-left-color: #c084fc !important;
    color: #d8b4fe !important;
}

.dark-mode #link-studytok.active {
    background-color: rgba(251, 113, 133, 0.15) !important;
    border-left-color: #fb7185 !important;
    color: #fda4af !important;
}

.dark-mode #link-stats.active {
    background-color: rgba(248, 113, 113, 0.15) !important;
    border-left-color: #f87171 !important;
    color: #fca5a5 !important;
}


/* --- Buscador en Menú --- */
.menu-search-wrapper {
    margin: 0 16px 14px 16px;
    position: relative;
}

.menu-search-input {
    width: 100%;
    padding: 9px 14px 9px 36px;
    border: 2px solid var(--menu-hover);
    border-radius: 12px;
    background: var(--bg-color);
    color: var(--text-color);
    font-family: 'Nunito', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.menu-search-input:focus {
    border-color: var(--menu-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.menu-search-wrapper .search-icon {
    position: absolute;
    left: 11px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    font-size: 0.85rem;
    pointer-events: none;
}

.dark-mode .menu-search-input {
    background: #0f172a;
    border-color: #334155;
    color: #e2e8f0;
}

/* --- Listas del Menú --- */
.subject-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.subject-item {
    padding: 15px 25px;
    font-size: 1.05rem;
    color: var(--menu-text);
    text-decoration: none;
    font-weight: 700;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    border-left: 5px solid transparent;
    cursor: pointer;
}

.subject-item:hover {
    background-color: var(--menu-hover);
    padding-left: 30px;
}

/* --- Colores dinámicos al hacer click (active) en la asignatura --- */
.subject-item.active {
    font-weight: 800;
}

#btn-espanol.active {
    background-color: #eff6ff !important;
    color: #1d4ed8 !important;
    border-left-color: #2563eb !important;
}

#btn-matematicas.active {
    background-color: #f3e8ff !important;
    color: #6d28d9 !important;
    border-left-color: #7c3aed !important;
}

#btn-fisica.active {
    background-color: #ecfeff !important;
    color: #0e7490 !important;
    border-left-color: #0891b2 !important;
}

#btn-quimica.active {
    background-color: #f0fdf4 !important;
    color: #15803d !important;
    border-left-color: #16a34a !important;
}

#btn-biologia.active {
    background-color: #fffbeb !important;
    color: #b45309 !important;
    border-left-color: #d97706 !important;
}

#btn-hist-univ.active {
    background-color: #fef2f2 !important;
    color: #b91c1c !important;
    border-left-color: #dc2626 !important;
}

#btn-historia.active {
    background-color: #fff7ed !important;
    color: #c2410c !important;
    border-left-color: #ea580c !important;
}

#btn-literatura.active {
    background-color: #faf5ff !important;
    color: #7e22ce !important;
    border-left-color: #9333ea !important;
}

#btn-geografia.active {
    background-color: #f0fdfa !important;
    color: #0f766e !important;
    border-left-color: #0d9488 !important;
}

#btn-todas-unam.active {
    background-color: #fff7ed !important;
    color: #c2410c !important;
    border-left-color: #ea580c !important;
}

#btn-simulacro.active {
    background-color: #eff6ff !important;
    color: #1d4ed8 !important;
    border-left-color: #2563eb !important;
}

#btn-guided.active {
    background-color: #f0fdfa !important;
    color: #0f766e !important;
    border-left-color: #0d9488 !important;
}

#link-flashcards.active {
    background-color: #f5f3ff !important;
    color: #6d28d9 !important;
    border-left-color: #7c3aed !important;
}

#link-studytok.active {
    background-color: #fff1f2 !important;
    color: #be123c !important;
    border-left-color: #e11d48 !important;
}

#link-stats.active {
    background-color: #fef2f2 !important;
    color: #b91c1c !important;
    border-left-color: #dc2626 !important;
}



.subject-icon {
    margin-right: 12px;
    font-size: 1.3rem;
    width: 24px;
    text-align: center;
}

.arrow-icon {
    margin-left: 6px;
    transition: transform var(--transition-smooth);
    font-size: 0.8rem;
    opacity: 0.6;
}

.subject-item.open .arrow-icon {
    transform: rotate(180deg);
}

.sub-menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    background-color: #f8fafc;
    transition: max-height 0.38s ease-out, opacity 0.35s ease-out;
}

.dark-mode .sub-menu-list {
    background-color: #0f172a;
}

.sub-menu-list.expanded {
    opacity: 1;
}

/* Animación escalonada de los items al abrir submenu */
.sub-menu-list.expanded li {
    animation: slideInLeft 0.3s ease both;
}

.sub-menu-list.expanded li:nth-child(1) {
    animation-delay: 0.04s;
}

.sub-menu-list.expanded li:nth-child(2) {
    animation-delay: 0.08s;
}

.sub-menu-list.expanded li:nth-child(3) {
    animation-delay: 0.12s;
}

.sub-menu-list.expanded li:nth-child(4) {
    animation-delay: 0.16s;
}

.sub-menu-list.expanded li:nth-child(5) {
    animation-delay: 0.20s;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-12px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.class-item {
    padding: 11px 20px 11px 48px;
    font-size: 0.93rem;
    color: #475569;
    text-decoration: none;
    display: flex;
    align-items: center;
    border-left: 5px solid transparent;
    transition: all 0.2s ease;
    gap: 10px;
    position: relative;
}

.class-item-label {
    min-width: 0;
}

.menu-hit {
    background: #fef08a;
    color: #713f12;
    border-radius: 6px;
    padding: 0 2px;
    font-weight: 900;
}

.dark-mode .menu-hit {
    background: #854d0e;
    color: #fde68a;
}

.dark-mode .class-item {
    color: #94a3b8;
}

.class-item.active-class {
    font-weight: 900;
    color: var(--menu-accent);
    background-color: #e2e8f0;
    border-left-color: var(--menu-accent);
}

.dark-mode .class-item.active-class {
    background-color: #1e3a8a;
    color: #bfdbfe;
}

.class-item:hover {
    background-color: #f1f5f9;
    color: var(--menu-accent);
    border-left-color: var(--menu-accent);
    padding-left: 55px;
}

.dark-mode .class-item:hover {
    background-color: #1e293b;
}

/* Badge de clase completada en el menú */
.class-item .done-badge {
    margin-left: auto;
    font-size: 0.75rem;
    background: #d1fae5;
    color: #065f46;
    border-radius: 20px;
    padding: 2px 7px;
    font-weight: 900;
    flex-shrink: 0;
    display: none;
}

.class-item.studied .done-badge {
    display: inline;
}

.dark-mode .class-item .done-badge {
    background: #064e3b;
    color: #6ee7b7;
}

/* Badge de clases pendientes en subject-item */
.subject-pending-badge {
    display: none;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 99px;
    font-size: 0.72rem;
    font-weight: 900;
    margin-left: auto;
    flex-shrink: 0;
    transition: all 0.3s ease;
    line-height: 1;
    /* Estado: clases pendientes */
    background: #fef3c7;
    color: #92400e;
    border: 1.5px solid #fcd34d;
    animation: badgePop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.subject-pending-badge.visible {
    display: inline-flex;
}

.subject-pending-badge.all-done {
    background: #d1fae5;
    color: #065f46;
    border-color: #6ee7b7;
}

@keyframes badgePop {
    from {
        transform: scale(0);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.dark-mode .subject-pending-badge {
    background: #451a03;
    color: #fcd34d;
    border-color: #92400e;
}

.dark-mode .subject-pending-badge.all-done {
    background: #064e3b;
    color: #6ee7b7;
    border-color: #065f46;
}

/* --- Botón de Inicio en el menú --- */
.home-menu-link {
    background: #e0f2fe !important;
    border-left: 4px solid #0284c7 !important;
    font-weight: 800 !important;
    color: #0284c7 !important;
    padding: 12px 15px !important;
    border-radius: 8px !important;
}

.home-menu-link:hover {
    background: #bae6fd !important;
    color: #0369a1 !important;
}

.dark-mode .home-menu-link {
    background: #0c2340 !important;
    border-left-color: #3b82f6 !important;
    color: #93c5fd !important;
}

.dark-mode .home-menu-link:hover {
    background: #1e3a5f !important;
    color: #bfdbfe !important;
}

/* --- Overlay --- */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.45);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    backdrop-filter: blur(3px);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* --- Layout Principal --- */
.main-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.subject-content {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: center;
    animation: fadeInPage 0.45s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

.subject-content.visible {
    display: flex;
}

/* --- Animaciones Globales --- */
@keyframes fadeInPage {
    from {
        opacity: 0;
        transform: translateY(18px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulseMain {
    0% {
        transform: scale(1);
        box-shadow: 0 0 15px rgba(255, 228, 181, 0.6), var(--shadow);
    }

    100% {
        transform: scale(1.02);
        box-shadow: 0 0 30px rgba(255, 228, 181, 1), var(--shadow);
    }
}

@keyframes pulseMainEsp {
    0% {
        transform: scale(1);
        box-shadow: 0 0 15px rgba(224, 242, 254, 0.6), var(--shadow);
    }

    100% {
        transform: scale(1.02);
        box-shadow: 0 0 30px rgba(224, 242, 254, 1), var(--shadow);
    }
}

/* --- Títulos --- */
h1.title-main {
    text-align: center;
    font-size: 2.6rem;
    font-weight: 900;
    color: var(--menu-accent);
    letter-spacing: 0.4px;
    line-height: 1.25;
    margin-top: 20px;
    margin-bottom: 36px;
    padding: 14px 28px;
    border-radius: 999px;
    border: 2px solid var(--menu-hover);
    background: var(--menu-bg);
    box-shadow: var(--shadow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    animation: fadeInDown 0.8s ease-out;
}

h1.title-main i {
    font-size: 0.82em;
    opacity: 0.95;
}

.dark-mode .title-main {
    color: #93c5fd !important;
    border-color: #334155;
}

/* --- Mindmap --- */
.mindmap-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    width: 100%;
    max-width: 1200px;
}

.main-topic {
    background-color: var(--main-node);
    color: #b45309;
    padding: 25px 40px;
    border-radius: 40px;
    max-width: 600px;
    text-align: center;
    box-shadow: 0 0 20px rgba(255, 228, 181, 0.8), var(--shadow);
    border: 4px solid #fff;
    animation: pulseMain 2.5s infinite alternate;
    cursor: pointer;
    transition: transform 0.3s;
}

.espanol-topic {
    background-color: #e0f2fe;
    color: #0369a1;
    box-shadow: 0 0 20px rgba(224, 242, 254, 0.8), var(--shadow);
    animation: pulseMainEsp 2.5s infinite alternate;
}

.main-topic:hover {
    transform: scale(1.05);
    animation-play-state: paused;
}

.main-topic h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    margin: 0 0 10px 0;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: nowrap;
}

.main-topic h2 .main-topic-title-text {
    text-align: center;
    white-space: nowrap;
    line-height: 1.1;
}

.main-topic h2 .main-topic-title-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}

.main-topic h2 .main-topic-title-icon i {
    margin: 0;
}

.main-topic p {
    font-size: 1.2rem;
    margin: 0;
    font-weight: 700;
}

.dark-mode .main-topic h2,
.dark-mode .main-topic p {
    color: #fff;
}

.branches {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
    width: 100%;
    flex-wrap: wrap;
}

.branch-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    flex: 1;
    min-width: 320px;
}

.topic-node {
    width: 100%;
    box-sizing: border-box;
    padding: 20px 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    border: 3px solid rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    position: relative;
    overflow: hidden;
}

.topic-node::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.4) 50%, rgba(255, 255, 255, 0) 100%);
    transform: rotate(30deg) translate(-100%, -100%);
    transition: all 0.5s;
    pointer-events: none;
}

.topic-node:hover::after {
    transform: rotate(30deg) translate(100%, 100%);
}

.topic-node:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.topic-node h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.dark-mode .topic-node h2 {
    color: #fff;
}

.topic-1 {
    background-color: var(--branch-1);
    color: #005f73;
}

.topic-2 {
    background-color: var(--branch-2);
    color: #2d6a4f;
}

.topic-3 {
    background-color: var(--branch-3);
    color: #944000;
}

.topic-4 {
    background-color: var(--branch-4);
    color: #4c1d95;
}

.topic-5 {
    background-color: var(--branch-5);
    color: #831843;
}

/* --- Sub Nodos --- */
.sub-nodes-container {
    display: flex;
    flex-direction: column;
    gap: 18px;
    width: 95%;
    transform-origin: top;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.sub-nodes-container.hidden {
    opacity: 0;
    transform: scaleY(0);
    height: 0;
    overflow: hidden;
    margin: 0;
    gap: 0;
}

.sub-node {
    background: var(--sub-node-bg);
    padding: 18px 22px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    border-left: 8px solid;
    font-size: 1rem;
    line-height: 1.5;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    position: relative;
}

.sub-node:hover {
    transform: translateX(10px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    z-index: 5;
}

.sub-node h3 {
    margin: 0 0 10px 0;
    font-size: 1.2rem;
    color: #1e293b;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

.dark-mode .sub-node h3 {
    color: var(--header-text);
}

.sub-node h3 i {
    color: #64748b;
    margin-right: 8px;
    font-size: 1.1rem;
}

.sub-node p {
    margin: 0 0 10px 0;
    font-weight: 400;
    color: #475569;
}

.dark-mode .sub-node p {
    color: var(--card-text);
}

.sub-node b,
.sub-node strong {
    color: #0f172a;
    font-weight: 900;
    background-color: rgba(255, 228, 181, 0.4);
    padding: 0 4px;
    border-radius: 4px;
}

.dark-mode .sub-node b,
.dark-mode .sub-node strong {
    color: #fef3c7;
    background-color: rgba(120, 53, 15, 0.4);
}

.topic-1-sub {
    border-left-color: var(--branch-1);
}

.topic-2-sub {
    border-left-color: var(--branch-2);
}

.topic-3-sub {
    border-left-color: var(--branch-3);
}

.topic-4-sub {
    border-left-color: var(--branch-4);
}

.topic-5-sub {
    border-left-color: var(--branch-5);
}

.badge {
    font-size: 0.75rem;
    background-color: #f1f5f9;
    color: #64748b;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
}

.example-box {
    background-color: #f8fafc;
    border-left: 3px solid #cbd5e1;
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    color: #334155;
    margin-top: 10px;
}

.dark-mode .example-box {
    background-color: #334155;
    color: #e2e8f0;
    border-left-color: #475569;
}

.example-box ul {
    margin: 0;
    padding-left: 18px;
    font-style: italic;
    font-size: 0.9rem;
}

.example-box li {
    margin-bottom: 5px;
}

.example-box li:last-child {
    margin-bottom: 0;
}

.click-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.dark-mode .click-hint {
    opacity: 1;
    color: #f8fafc;
    background: rgba(15, 23, 42, 0.35);
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 999px;
    padding: 4px 10px;
    width: fit-content;
    margin: 6px auto 0;
}

/* --- Botón "Marcar como Estudiado" --- */
.btn-mark-studied {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 20px;
    border: 2px solid #cbd5e1;
    cursor: pointer;
    transition: all 0.2s ease;
    background: #f8fafc;
    color: #64748b;
    font-family: 'Nunito', sans-serif;
    margin-top: 8px;
}

.btn-mark-studied:hover {
    border-color: #10b981;
    color: #065f46;
    background: #d1fae5;
}

.btn-mark-studied.done {
    border-color: #10b981;
    color: #065f46;
    background: #d1fae5;
}

.btn-mark-studied.done::before {
    content: "✓ ";
}

.dark-mode .btn-mark-studied {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: #ecfdf5;
    box-shadow: 0 10px 20px rgba(5, 150, 105, 0.35);
}

.dark-mode .btn-mark-studied.done {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: #34d399;
    color: #ffffff;
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.4);
}

/* Animaciones del mindmap */
.visible .branch-col:nth-child(1) {
    animation: slideUp 0.6s ease-out backwards 0.1s;
}

.visible .branch-col:nth-child(2) {
    animation: slideUp 0.6s ease-out backwards 0.3s;
}

.visible .branch-col:nth-child(3) {
    animation: slideUp 0.6s ease-out backwards 0.5s;
}

.visible .sub-node {
    animation: fadeInRight 0.5s forwards;
}

/* --- Video Section --- */
.video-section {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    background: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 6px solid #ef4444;
    padding: 30px 40px;
    box-sizing: border-box;
    font-family: 'Nunito', sans-serif;
    position: relative;
}

.dark-mode .video-section {
    background: #1e293b;
    color: var(--text-color);
}

.video-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 15px;
    margin-bottom: 25px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.video-header:hover {
    opacity: 0.8;
}

.video-header h2 {
    margin: 0;
    color: #b91c1c;
    font-size: 1.8rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 12px;
}

.video-header h2 i {
    color: #ef4444;
}

.dark-mode .video-header h2 {
    color: var(--header-text);
}

.video-container-responsive {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.video-container-responsive iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* --- Sección Preguntas --- */
.unam-questions-section {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    background: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 6px solid #2563eb;
    padding: 30px 40px;
    box-sizing: border-box;
    font-family: 'Nunito', sans-serif;
    position: relative;
}

.dark-mode .unam-questions-section {
    background: #1e293b;
    color: var(--text-color);
}

.unam-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid #e0e7ff;
    padding-bottom: 15px;
    margin-bottom: 25px;
    cursor: pointer;
}

.unam-header h2 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 12px;
}

.unam-toggle-btn {
    background: #f1f5f9;
    color: #475569;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Nunito', sans-serif;
}

.unam-toggle-btn:hover {
    background: #e2e8f0;
}

.dark-mode .unam-toggle-btn {
    background: #334155;
    color: #94a3b8;
}

.dark-mode .unam-toggle-btn:hover {
    background: #475569;
}

.unam-questions-container {
    display: flex;
    flex-direction: column;
    gap: 25px;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.unam-question-card {
    background: #f8fafc;
    border-radius: 15px;
    padding: 20px;
    border: 1px solid #e2e8f0;
}

.dark-mode .unam-question-card {
    background: #0f172a;
    border-color: #334155;
}

.unam-question-text {
    font-size: 1.1rem;
    color: #1e293b;
    margin: 0 0 15px 0;
    font-weight: 700;
}

.dark-mode .unam-question-text {
    color: #e2e8f0;
}

.unam-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.unam-option {
    background: #ffffff;
    border: 2px solid #cbd5e1;
    border-radius: 10px;
    padding: 12px 15px;
    cursor: pointer;
    font-size: 1rem;
    color: #334155;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Nunito', sans-serif;
}

.unam-option:hover {
    border-color: #94a3b8;
    background: #f1f5f9;
}

.unam-option.selected {
    border-color: #3b82f6;
    background: #eff6ff;
    font-weight: 700;
}

.unam-option.correct {
    border-color: #10b981;
    background: #d1fae5;
    color: #065f46;
}

.unam-option.incorrect {
    border-color: #ef4444;
    background: #fee2e2;
    color: #991b1b;
}

.dark-mode .unam-option {
    background: #1e293b;
    border-color: #475569;
    color: #e2e8f0;
}

.dark-mode .unam-option:hover {
    border-color: #94a3b8;
    background: #334155;
}

.dark-mode .unam-option.selected {
    background: #1e3a8a;
    border-color: #3b82f6;
    color: #bfdbfe;
}

.dark-mode .unam-option.correct {
    background: #064e3b;
    border-color: #10b981;
    color: #a7f3d0;
}

.dark-mode .unam-option.incorrect {
    background: #450a0a;
    border-color: #ef4444;
    color: #fca5a5;
}

.unam-feedback {
    margin-top: 15px;
    padding: 15px;
    border-radius: 10px;
    font-size: 0.95rem;
    display: none;
    animation: fadeInPage 0.3s ease forwards;
    flex-direction: column;
    gap: 5px;
}

.unam-feedback.correct-feedback {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}

.unam-feedback.incorrect-feedback {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

.dark-mode .unam-feedback.correct-feedback {
    background: #064e3b;
    color: #a7f3d0;
    border-left-color: #10b981;
}

.dark-mode .unam-feedback.incorrect-feedback {
    background: #450a0a;
    color: #fca5a5;
    border-left-color: #ef4444;
}

.unam-eval-btn {
    margin-top: 15px;
    background: #2563eb;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s ease;
    align-self: flex-start;
    font-family: 'Nunito', sans-serif;
}

.unam-eval-btn:hover {
    background: #1d4ed8;
}

.unam-eval-btn:disabled {
    background: #94a3b8;
    cursor: not-allowed;
}

.dark-mode .unam-eval-btn:disabled {
    background: #334155;
    color: #64748b;
}

.exam-tip {
    background: #fef08a;
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
    color: #854d0e;
    font-size: 0.9rem;
}

.dark-mode .exam-tip {
    background: #451a03;
    color: #fcd34d;
}

/* --- Dashboard Global UNAM --- */
.unam-dashboard-container {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    border: 2px solid #f1f5f9;
}

.dark-mode .unam-dashboard-container {
    background: #1e293b;
    border-color: #334155;
}

.unam-dashboard-header {
    margin-top: 0;
    color: #334155;
    font-size: 1.4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.dark-mode .unam-dashboard-header {
    color: #e2e8f0;
}

.unam-dashboard-badge {
    font-size: 1.1rem;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 900;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.unam-dashboard-grid {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px dashed #cbd5e1;
}

.unam-dashboard-grid.open {
    display: grid;
}

.dark-mode .unam-dashboard-grid {
    border-top-color: #334155;
}

.unam-dashboard-item {
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 12px;
    transition: transform 0.2s;
    cursor: pointer;
}

.dark-mode .unam-dashboard-item {
    background: #0f172a;
    border-color: #334155;
}

.unam-dashboard-item:hover {
    transform: translateY(-2px);
}

.unam-dashboard-item-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.unam-dashboard-item-title {
    font-weight: 800;
    color: #475569;
}

.unam-dashboard-item-count {
    font-weight: 900;
}

.unam-dashboard-progress-bar-bg,
.unam-dashboard-item-progress-bg {
    background: #e2e8f0;
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
}

.dark-mode .unam-dashboard-progress-bar-bg,
.dark-mode .unam-dashboard-item-progress-bg {
    background: #334155;
}

.unam-dashboard-progress-bar-bg {
    height: 12px;
    margin-bottom: 10px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.unam-dashboard-progress-bar-fill,
.unam-dashboard-item-progress-fill {
    height: 100%;
    transition: width 1s;
}

.unam-subject-header {
    margin-top: 40px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    scroll-margin-top: 20px;
}

.dark-mode .unam-subject-header {
    border-bottom-color: #334155;
}

.unam-subject-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.unam-subject-header-indicator {
    background: #3b82f6;
    width: 8px;
    height: 30px;
    border-radius: 4px;
}

.unam-subject-header-title {
    margin: 0;
    color: #1e293b;
    font-size: 1.6rem;
    font-weight: 900;
}

.dark-mode .unam-subject-header-title {
    color: #e2e8f0;
}

.unam-question-card-inner-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.unam-question-card-badges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.unam-dashboard-item-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.unam-dashboard-item-title {
    font-weight: 800;
    color: #475569;
}

.unam-dashboard-item-count {
    font-weight: 900;
}

/* --- Badges --- */
.badge-dark {
    background: #1e293b;
    color: #fbbf24;
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 900;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    border: 1px solid #334155;
}

.badge-orange {
    background: #fff7ed;
    color: #c2410c;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: bold;
    border: 1px solid #ffedd5;
}

.badge-blue {
    background: #f0f9ff;
    color: #0369a1;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: bold;
    border: 1px solid #e0f2fe;
}

.dark-mode .badge-orange {
    background: #431407;
    color: #fb923c;
    border-color: #7c2d12;
}

.dark-mode .badge-blue {
    background: #0c2a4a;
    color: #7dd3fc;
    border-color: #0369a1;
}

/* --- Botones de Acción --- */
.btn-subir {
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    padding: 6px 12px;
    font-weight: bold;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    gap: 6px;
    align-items: center;
    transition: all 0.2s;
    font-family: 'Nunito', sans-serif;
}

.btn-subir:hover {
    background: #e2e8f0;
    color: #1e293b;
}

.dark-mode .btn-subir {
    background: #334155;
    color: #cbd5e1;
    border-color: #475569;
}

.dark-mode .btn-subir:hover {
    background: #475569;
    color: #f8fafc;
}

.btn-repasar-clase {
    font-size: 0.85rem;
    color: #3b82f6;
    font-weight: bold;
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    display: flex;
    gap: 5px;
    align-items: center;
    transition: all 0.2s;
}

.btn-repasar-clase:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

.dark-mode .btn-repasar-clase {
    background: #1e3a8a;
    color: #bfdbfe;
    border-color: #1d4ed8;
}

.dark-mode .btn-repasar-clase:hover {
    background: #1d4ed8;
}

/* --- Panel Resumen Simulacro --- */
.sim-results-panel {
    background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 100%);
    color: #fff;
    border-radius: 20px;
    padding: 35px 40px;
    text-align: center;
    margin: 30px auto;
    max-width: 700px;
    box-shadow: 0 20px 50px rgba(37, 99, 235, 0.35);
    animation: fadeInPage 0.5s ease forwards;
}

.sim-results-panel h2 {
    font-size: 2rem;
    margin: 0 0 10px 0;
}

.sim-score-circle {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 4px solid rgba(255, 255, 255, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 20px auto;
    font-size: 2.8rem;
    font-weight: 900;
}

.sim-score-circle span {
    font-size: 1rem;
    font-weight: 600;
    opacity: 0.8;
}

.sim-results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin: 20px 0;
}

.sim-stat-box {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 15px;
    transition: transform 0.2s;
}

.sim-stat-box:hover {
    transform: translateY(-3px);
}

.sim-stat-box .stat-num {
    font-size: 1.8rem;
    font-weight: 900;
}

.sim-stat-box .stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
}

.btn-new-sim {
    background: #fff;
    color: #1d4ed8;
    border: none;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 900;
    cursor: pointer;
    margin-top: 10px;
    transition: all 0.2s;
    font-family: 'Nunito', sans-serif;
}

.btn-new-sim:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* --- Historial de Simulacros --- */
.sim-history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.sim-history-item {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.9rem;
}

.dark-mode .sim-history-item {
    background: #1e293b;
    border-color: #334155;
    color: #e2e8f0;
}

.sim-history-score {
    font-size: 1.3rem;
    font-weight: 900;
    color: #2563eb;
    min-width: 50px;
}

.dark-mode .sim-history-score {
    color: #60a5fa;
}

.sim-history-date {
    color: #64748b;
    margin-left: auto;
    font-size: 0.8rem;
}

/* --- Páginas "Próximamente" --- */
.coming-soon-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    padding: 40px 20px;
}

.coming-soon-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    animation: floatDeco 4s infinite alternate ease-in-out;
}

.coming-soon-page h2 {
    font-size: 2.5rem;
    color: var(--menu-accent);
    margin: 0 0 12px 0;
}

.coming-soon-page p {
    color: var(--card-text);
    font-size: 1.1rem;
    max-width: 380px;
}

.coming-soon-badge {
    background: #fef3c7;
    color: #d97706;
    padding: 6px 18px;
    border-radius: 20px;
    font-weight: 900;
    font-size: 0.9rem;
    margin-bottom: 20px;
    display: inline-block;
}

.dark-mode .coming-soon-badge {
    background: #44403c;
    color: #fbbf24;
}

/* --- Página Inicio --- */
.home-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 85vh;
    padding: 40px 20px;
    width: 100%;
    overflow: hidden;
}

.home-bg-blobs {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    pointer-events: none;
}

.blob-1 {
    position: absolute;
    top: -5%;
    left: -5%;
    width: 55vw;
    height: 55vw;
    max-width: 700px;
    max-height: 700px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.18) 0%, rgba(59, 130, 246, 0) 70%);
    border-radius: 50%;
    animation: floatBlob 10s infinite alternate ease-in-out;
}

.blob-2 {
    position: absolute;
    bottom: -5%;
    right: -5%;
    width: 65vw;
    height: 65vw;
    max-width: 800px;
    max-height: 800px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.14) 0%, rgba(16, 185, 129, 0) 70%);
    border-radius: 50%;
    animation: floatBlob 12s infinite alternate-reverse ease-in-out;
}

@keyframes floatBlob {
    0% {
        transform: translateY(0) scale(1);
    }

    100% {
        transform: translateY(-50px) scale(1.1);
    }
}

.home-quote {
    position: relative;
    z-index: 1;
    font-size: 2.8rem;
    font-weight: 900;
    color: #1e293b;
    max-width: 850px;
    margin-bottom: 70px;
    font-style: italic;
    line-height: 1.4;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.05);
    animation: fadeInDown 1.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.dark-mode .home-quote {
    color: #e2e8f0;
}

.home-quote .highlight {
    color: #0369a1;
    position: relative;
    display: inline-block;
}

.home-quote .highlight::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 0;
    width: 100%;
    height: 10px;
    background-color: rgba(245, 158, 11, 0.5);
    z-index: -1;
    transform: rotate(-2deg);
    border-radius: 5px;
}

.home-card {
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 40px 50px;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(255, 255, 255, 0.8) inset;
    border-top: 6px solid #10b981;
    max-width: 580px;
    animation: slideUp 1s 0.3s cubic-bezier(0.25, 0.8, 0.25, 1) both;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.home-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(255, 255, 255, 1) inset;
}

.dark-mode .home-card {
    background: rgba(30, 41, 59, 0.9);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.dark-mode .home-card p {
    color: #cbd5e1 !important;
}

.home-card i.heart-icon {
    color: #ef4444;
    font-size: 3rem;
    margin-bottom: 20px;
    display: inline-block;
    filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.4));
    animation: pulseHeart 1.5s infinite ease-in-out;
}

@keyframes pulseHeart {

    0%,
    100% {
        transform: scale(1);
    }

    15% {
        transform: scale(1.2);
    }

    30% {
        transform: scale(1);
    }

    45% {
        transform: scale(1.25);
    }

    60% {
        transform: scale(1);
    }
}

.home-deco-icon {
    position: absolute;
    z-index: 0;
    opacity: 0.5;
    animation: floatDeco 8s infinite alternate ease-in-out;
}

.deco-1 {
    top: 15%;
    left: 10%;
    color: #93c5fd;
    font-size: 4rem;
    animation-delay: 0s;
}

.deco-2 {
    bottom: 25%;
    right: 12%;
    color: #fcd34d;
    font-size: 5rem;
    animation-delay: -2s;
}

.deco-3 {
    top: 30%;
    right: 15%;
    color: #a7f3d0;
    font-size: 3.5rem;
    animation-delay: -4s;
}

.deco-4 {
    bottom: 20%;
    left: 15%;
    color: #c4b5fd;
    font-size: 4rem;
    animation-delay: -1s;
}

@keyframes floatDeco {
    0% {
        transform: translateY(0) rotate(-15deg);
    }

    100% {
        transform: translateY(-30px) rotate(15deg);
    }
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .branches {
        flex-direction: column;
        align-items: center;
    }

    .branch-col {
        width: 100%;
        max-width: 500px;
        margin-bottom: 20px;
    }

    h1.title-main {
        font-size: 2rem;
        margin-top: 60px;
        padding: 12px 20px;
        border-radius: 24px;
    }

    .sim-results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .home-quote {
        font-size: 2rem;
    }

    .home-card {
        padding: 30px;
    }

    .home-deco-icon {
        font-size: 2.5rem !important;
    }

    .sim-results-panel {
        padding: 25px 20px;
    }

    .video-section,
    .unam-questions-section {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .sim-results-grid {
        grid-template-columns: 1fr;
    }
}

/* =====================================================
   DARK MODE: Nodo principal Español
   ===================================================== */
.dark-mode .espanol-topic {
    background-color: #082f49;
    color: #7dd3fc;
    box-shadow: 0 0 20px rgba(14, 165, 233, 0.25), var(--shadow);
}

.dark-mode .espanol-topic h2,
.dark-mode .espanol-topic p {
    color: #bae6fd;
}

.dark-mode .main-topic {
    border-color: rgba(255, 255, 255, 0.08);
}

/* =====================================================
   DARK MODE: Active items del menú
   ===================================================== */
.dark-mode .subject-item.active {
    background-color: #052e16;
    color: #4ade80;
    border-left-color: #22c55e;
}

.dark-mode .subject-item.active-espanol {
    background-color: #0c1d4e;
    color: #93c5fd;
    border-left-color: #3b82f6;
}

/* =====================================================
   SCROLLBAR personalizado (menú y body)
   ===================================================== */
.side-menu {
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 transparent;
}

.side-menu::-webkit-scrollbar {
    width: 5px;
}

.side-menu::-webkit-scrollbar-track {
    background: transparent;
}

.side-menu::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

.dark-mode .side-menu {
    scrollbar-color: #475569 transparent;
}

.dark-mode .side-menu::-webkit-scrollbar-thumb {
    background: #475569;
}

::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

.dark-mode ::-webkit-scrollbar-thumb {
    background: #475569;
}

.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

/* =====================================================
   SIMULACRO: Tarjetas de selección de materias
   ===================================================== */
#subject-checkboxes {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 8px;
}

.sim-filter-actions {
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
}

.sim-filter-actions button {
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 800;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.sim-filter-actions button:hover {
    background: #e2e8f0;
    color: #1e293b;
    transform: translateY(-1px);
}

.dark-mode .sim-filter-actions button {
    background: #334155;
    border-color: #475569;
    color: #cbd5e1;
}

.dark-mode .sim-filter-actions button:hover {
    background: #475569;
    color: #f8fafc;
}

.sim-materia-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 10px;
    border-radius: 14px;
    border: 2px solid #e2e8f0;
    background: #f8fafc;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    text-align: center;
    user-select: none;
    width: 135px;
    min-height: 120px;
    height: auto;
    flex-shrink: 0;
    box-sizing: border-box;
    overflow: visible;
}

.sim-materia-card:hover {
    border-color: #94a3b8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.sim-materia-card.unchecked {
    opacity: 0.45;
    border-color: #e2e8f0;
    background: #f1f5f9;
}

.sim-materia-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    transition: transform 0.2s;
}

.sim-materia-card:hover .sim-materia-icon {
    transform: scale(1.1);
}

.sim-materia-name {
    font-size: 0.85rem;
    font-weight: 800;
    color: #334155;
    line-height: 1.1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    width: 100%;
    margin-bottom: 2px;
}

.sim-materia-check {
    position: absolute;
    top: 6px;
    right: 8px;
    color: #10b981;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.sim-materia-card.unchecked .sim-materia-check {
    opacity: 0;
}

/* Dark mode */
.dark-mode .sim-materia-card {
    background: #1e293b;
    border-color: #334155;
}

.dark-mode .sim-materia-card:hover {
    border-color: #475569;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dark-mode .sim-materia-card.unchecked {
    background: #0f172a;
    border-color: #1e293b;
}

.dark-mode .sim-materia-name {
    color: #e2e8f0;
}

/* =====================================================
   SIMULACRO: Tarjetas de modo
   ===================================================== */
.sim-mode-card {
    background: var(--surface-color, #fff);
    border: 1.5px solid #e2e8f0;
    border-radius: 16px;
    padding: 20px 22px;
    margin-bottom: 16px;
    transition: box-shadow 0.2s;
}
.sim-mode-card:hover {
    box-shadow: 0 4px 18px rgba(0,0,0,.08);
}
.dark-mode .sim-mode-card {
    background: #1e293b;
    border-color: #334155;
}
.sim-mode-card--full  { border-left: 4px solid #2563eb; }
.sim-mode-card--reduced { border-left: 4px solid #7c3aed; }

.sim-mode-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}
.sim-mode-header > i { font-size: 1.4rem; margin-top: 2px; flex-shrink: 0; }
.sim-mode-header > div { flex: 1; }
.sim-mode-header h3 { font-size: 1.05rem; }

.sim-start-btn {
    flex-shrink: 0;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 10px;
    padding: 10px 18px;
    font-size: .95rem;
    font-weight: 800;
    cursor: pointer;
    font-family: inherit;
    white-space: nowrap;
}
.sim-start-btn--purple { background: #7c3aed; }
.sim-start-btn:hover { filter: brightness(1.1); }

.sim-dist-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid #f1f5f9;
    font-size: .82rem;
    color: #64748b;
}
.dark-mode .sim-dist-grid { border-color: #334155; }
.sim-dist-grid span { display: flex; align-items: center; gap: 5px; }
.sim-dist-grid b { color: #0f172a; font-weight: 900; }
.dark-mode .sim-dist-grid b { color: #f1f5f9; }

/* Separador de materia dentro del examen */
.sim-section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 10px;
    margin: 24px 0 8px;
    font-weight: 800;
    font-size: .95rem;
    width: 100%;
    box-sizing: border-box;
}
.sim-section-header:first-child { margin-top: 0; }
.sim-section-title { flex: 1; }
.sim-section-range {
    font-size: .78rem;
    font-weight: 600;
    opacity: .7;
    white-space: nowrap;
}

/* =====================================================
   BOTÓN: Marcar como Estudiada
   ===================================================== */
.btn-mark-studied {
    padding: 15px 35px;
    font-size: 1.1rem;
    font-weight: 800;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.2);
    margin: 20px auto;
    font-family: 'Nunito', sans-serif;
    outline: none;
}

.btn-mark-studied i {
    font-size: 1.4rem;
}

.btn-mark-studied:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 15px 30px rgba(16, 185, 129, 0.35);
}

.btn-mark-studied:active {
    transform: translateY(-2px);
}

/* Estado: Completado (Done) */
.btn-mark-studied.done {
    background: linear-gradient(135deg, #34d399 0%, #059669 100%);
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.2);
}

.btn-mark-studied.done:hover {
    box-shadow: 0 15px 30px rgba(16, 185, 129, 0.35);
}

.class-nav-actions {
    display: grid;
    grid-template-columns: minmax(170px, 1fr) auto minmax(170px, 1fr);
    align-items: center;
    gap: 14px;
    width: 100%;
    max-width: 980px;
    margin: 30px auto 10px;
}

.btn-class-nav {
    border: 2px solid #cbd5e1;
    background: #f8fafc;
    color: #334155;
    border-radius: 14px;
    padding: 12px 14px;
    font-size: 0.95rem;
    font-weight: 800;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: 'Nunito', sans-serif;
    transition: all 0.2s ease;
}

.btn-class-nav:hover {
    border-color: #94a3b8;
    background: #eef2ff;
    color: #1e3a8a;
    transform: translateY(-2px);
}

.btn-class-prev {
    justify-self: start;
}

.btn-class-next {
    justify-self: end;
}

.btn-class-nav-spacer {
    display: block;
    width: 100%;
}

.class-nav-actions .btn-mark-studied {
    margin: 0;
}

/* =====================================================
   PERFIL — WIDGET EN SIDEBAR
   ===================================================== */
.profile-widget {
    margin: 0 12px 18px 12px;
    padding: 13px 14px;
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
    border: 1.5px solid #bfdbfe;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 11px;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    flex-shrink: 0;
    min-height: 0;
}

.profile-widget::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 15px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.06) 0%, rgba(16, 185, 129, 0.06) 100%);
    opacity: 0;
    transition: opacity 0.25s;
    pointer-events: none;
}

.profile-widget:hover::before {
    opacity: 1;
}

.profile-widget:hover {
    border-color: #93c5fd;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.12);
}

.profile-widget:active {
    transform: translateY(0);
}

.dark-mode .profile-widget {
    background: linear-gradient(135deg, #0f1f3d 0%, #0f2a1a 100%);
    border-color: #1e3a5f;
}

.dark-mode .profile-widget:hover {
    border-color: #3b82f6;
}

/* Avatar del widget */
.pw-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
    position: relative;
    background: #e2e8f0;
    color: #64748b;
    border: 2.5px solid #cbd5e1;
    transition: all 0.3s ease;
}

.pw-avatar.blue {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-color: #93c5fd;
}

.pw-avatar.pink {
    background: linear-gradient(135deg, #fce7f3, #fbcfe8);
    border-color: #f9a8d4;
}

/* Imagen de dinosaurio en el widget sidebar */
.pw-dino-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    border-radius: 50%;
    pointer-events: none;
    user-select: none;
}

.pw-avatar-edit {
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 18px;
    height: 18px;
    background: #2563eb;
    color: #fff;
    border-radius: 50%;
    font-size: 0.55rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #fff;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s;
}

.profile-widget:hover .pw-avatar-edit {
    opacity: 1;
    transform: scale(1);
}

.dark-mode .pw-avatar-edit {
    border-color: #1e293b;
}

/* Info del widget */
.pw-info {
    flex: 1;
    min-width: 0;
}

.pw-name {
    font-weight: 800;
    font-size: 0.92rem;
    color: #1e293b;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.dark-mode .pw-name {
    color: #f1f5f9;
}

.pw-stats {
    font-size: 0.72rem;
    color: #64748b;
    font-weight: 600;
    margin-bottom: 5px;
}

.dark-mode .pw-stats {
    color: #94a3b8;
}

.pw-bar {
    width: 100%;
    height: 5px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}

.dark-mode .pw-bar {
    background: #334155;
}

.pw-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6 0%, #10b981 100%);
    width: 0%;
    border-radius: 99px;
    transition: width 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.pw-arrow {
    color: #94a3b8;
    font-size: 0.7rem;
    flex-shrink: 0;
    transition: transform 0.2s, color 0.2s;
}

.profile-widget:hover .pw-arrow {
    transform: translateX(3px);
    color: #3b82f6;
}

/* =====================================================
   PERFIL — MODAL
   ===================================================== */
.pm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.pm-overlay.active {
    opacity: 1;
    visibility: visible;
}

.pm-card {
    background: #fff;
    border-radius: 24px;
    width: 100%;
    max-width: 420px;
    overflow: hidden;
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.1);
    transform: scale(0.92) translateY(20px);
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    max-height: 90vh;
    overflow-y: auto;
}

.pm-overlay.active .pm-card {
    transform: scale(1) translateY(0);
}

.dark-mode .pm-card {
    background: #1e293b;
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.55);
}

/* Header con gradiente */
.pm-header {
    position: relative;
    padding: 40px 24px 30px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1d4ed8 0%, #0f766e 100%);
    color: #fff;
}

.pm-header-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

/* Avatar grande en header */
.pm-avatar-preview {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: 3px solid rgba(255, 255, 255, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.4rem;
    margin: 0 auto 12px;
    position: relative;
    backdrop-filter: blur(4px);
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 1;
}

.pm-avatar-preview.blue {
    background: rgba(59, 130, 246, 0.25);
    border-color: rgba(147, 197, 253, 0.8);
}

.pm-avatar-preview.pink {
    background: rgba(236, 72, 153, 0.25);
    border-color: rgba(249, 168, 212, 0.8);
}

/* Imagen de dinosaurio en el modal */
.pm-dino-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    border-radius: 50%;
    pointer-events: none;
    user-select: none;
}

.pm-avatar-ring {
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.25);
    animation: pmRingPulse 3s infinite ease-in-out;
}

@keyframes pmRingPulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 0.6;
    }

    50% {
        transform: scale(1.08);
        opacity: 0.2;
    }
}

.pm-header-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.7;
    margin: 0 0 4px;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.pm-preview-name {
    font-size: 1.45rem;
    font-weight: 900;
    margin: 0;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    word-break: break-word;
}

/* Botón cerrar */
.pm-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 10;
}

.pm-close:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: rotate(90deg);
}

/* Cuerpo */
.pm-body {
    padding: 24px 24px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.pm-field {
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.pm-label {
    font-size: 0.82rem;
    font-weight: 800;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.dark-mode .pm-label {
    color: #94a3b8;
}

/* Input de nombre */
.pm-input-wrapper {
    position: relative;
}

.pm-input-wrapper input {
    width: 100%;
    padding: 13px 50px 13px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    color: #1e293b;
    background: #f8fafc;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    box-sizing: border-box;
}

.pm-input-wrapper input::placeholder {
    color: #cbd5e1;
    font-weight: 600;
}

.pm-input-wrapper input:focus {
    border-color: #3b82f6;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.12);
}

.dark-mode .pm-input-wrapper input {
    background: #0f172a;
    border-color: #334155;
    color: #f1f5f9;
}

.dark-mode .pm-input-wrapper input:focus {
    background: #1e293b;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.18);
}

.pm-char-count {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.72rem;
    font-weight: 700;
    color: #cbd5e1;
}

/* Selección de avatares */
.pm-avatar-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.pm-av-opt {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 18px 12px 14px;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
    user-select: none;
}

.pm-av-opt:hover {
    border-color: #93c5fd;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.dark-mode .pm-av-opt {
    background: #0f172a;
    border-color: #334155;
}

.dark-mode .pm-av-opt:hover {
    border-color: #3b82f6;
}

.pm-av-opt input[type="radio"] {
    display: none;
}

/* Círculo del avatar */
.pm-av-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.7rem;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.pm-av-blue {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #1d4ed8;
    border: 3px solid transparent;
}

.pm-av-pink {
    background: linear-gradient(135deg, #fce7f3, #fbcfe8);
    color: #be185d;
    border: 3px solid transparent;
}

/* Estado seleccionado */
.pm-av-opt:has(input:checked) {
    background: #fff;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.pm-av-opt:has(input[value="blue"]:checked) {
    border-color: #3b82f6;
    background: #eff6ff;
}

.pm-av-opt:has(input[value="pink"]:checked) {
    border-color: #ec4899;
    background: #fdf2f8;
}

.dark-mode .pm-av-opt:has(input[value="blue"]:checked) {
    background: #0c1f3f;
    border-color: #3b82f6;
}

.dark-mode .pm-av-opt:has(input[value="pink"]:checked) {
    background: #2a0a1d;
    border-color: #ec4899;
}

.pm-av-opt input[value="blue"]:checked~.pm-av-circle.pm-av-blue {
    border-color: #3b82f6;
    box-shadow: 0 0 0 5px rgba(59, 130, 246, 0.18), 0 0 20px rgba(59, 130, 246, 0.25);
    transform: scale(1.08);
}

.pm-av-opt input[value="pink"]:checked~.pm-av-circle.pm-av-pink {
    border-color: #ec4899;
    box-shadow: 0 0 0 5px rgba(236, 72, 153, 0.18), 0 0 20px rgba(236, 72, 153, 0.25);
    transform: scale(1.08);
}

.pm-av-label {
    font-size: 0.85rem;
    font-weight: 800;
    color: #475569;
}

.dark-mode .pm-av-label {
    color: #94a3b8;
}

.pm-av-check {
    position: absolute;
    top: 8px;
    right: 10px;
    font-size: 1rem;
    color: #10b981;
    opacity: 0;
    transform: scale(0);
    transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.pm-av-opt:has(input[value="blue"]:checked) .pm-av-check {
    opacity: 1;
    transform: scale(1);
    color: #3b82f6;
}

.pm-av-opt:has(input[value="pink"]:checked) .pm-av-check {
    opacity: 1;
    transform: scale(1);
    color: #ec4899;
}

/* Botón guardar */
/* Botón editar perfil → link a Configuración */
.pm-edit-link {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: #f1f5f9;
    border: 1.5px solid #e2e8f0;
    border-radius: 12px;
    color: #475569;
    font-size: 0.9rem;
    font-weight: 700;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.pm-edit-link:hover {
    background: #e0f2fe;
    border-color: #7dd3fc;
    color: #0369a1;
    transform: translateX(3px);
}

.dark-mode .pm-edit-link {
    background: #1e293b;
    border-color: #334155;
    color: #94a3b8;
}

.dark-mode .pm-edit-link:hover {
    background: #0c2340;
    border-color: #3b82f6;
    color: #93c5fd;
}

.pm-edit-arrow {
    margin-left: auto;
    font-size: 0.8rem;
    transition: transform 0.2s;
}

.pm-edit-link:hover .pm-edit-arrow {
    transform: translateX(4px);
}


/* Sección de progreso en modal */
/* =====================================================
   PERFIL — PANEL DE PROGRESO DETALLADO
   ===================================================== */
.pm-stats-panel {
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
    border-radius: 16px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.dark-mode .pm-stats-panel {
    background: #0f172a;
    border-color: #334155;
}

/* Encabezado del panel */
.pm-stats-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 800;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.dark-mode .pm-stats-header {
    color: #94a3b8;
}

/* Fila: circulo + tarjetas */
.pm-stats-overview {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Círculo SVG */
.pm-circle-wrap {
    position: relative;
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.pm-circle-svg {
    width: 80px;
    height: 80px;
    transform: rotate(-90deg);
}

.pm-circle-bg {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 8;
}

.dark-mode .pm-circle-bg {
    stroke: #334155;
}

.pm-circle-fill {
    fill: none;
    stroke: url(#circleGrad);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.pm-circle-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.pm-circle-pct {
    font-size: 1.05rem;
    font-weight: 900;
    color: #1e293b;
    line-height: 1;
}

.dark-mode .pm-circle-pct {
    color: #f1f5f9;
}

.pm-circle-label {
    font-size: 0.6rem;
    font-weight: 700;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Tarjetas de stats */
.pm-stats-cards {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pm-stat-card {
    display: flex;
    flex-direction: column;
    padding: 8px 12px;
    border-radius: 10px;
    gap: 1px;
}

.pm-stat-done {
    background: #d1fae5;
    border: 1px solid #6ee7b7;
}

.dark-mode .pm-stat-done {
    background: #052e16;
    border-color: #065f46;
}

.pm-stat-pending {
    background: #fef3c7;
    border: 1px solid #fcd34d;
}

.dark-mode .pm-stat-pending {
    background: #1c1200;
    border-color: #92400e;
}

.pm-stat-num {
    font-size: 1.3rem;
    font-weight: 900;
    color: #1e293b;
    line-height: 1;
}

.pm-stat-done .pm-stat-num {
    color: #065f46;
}

.pm-stat-pending .pm-stat-num {
    color: #92400e;
}

.dark-mode .pm-stat-done .pm-stat-num {
    color: #6ee7b7;
}

.dark-mode .pm-stat-pending .pm-stat-num {
    color: #fcd34d;
}

.pm-stat-lbl {
    font-size: 0.72rem;
    font-weight: 700;
    color: #64748b;
}

.dark-mode .pm-stat-lbl {
    color: #94a3b8;
}

/* Barra global */
.pm-global-bar-wrap {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.pm-progress-track {
    width: 100%;
    height: 10px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}

.dark-mode .pm-progress-track {
    background: #334155;
}

.pm-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #2563eb 0%, #10b981 100%);
    width: 0%;
    border-radius: 99px;
    transition: width 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.pm-progress-detail {
    font-size: 0.75rem;
    color: #94a3b8;
    font-weight: 600;
    text-align: right;
}

/* Desglose por materia */
.pm-subject-breakdown {
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-top: 1.5px solid #e2e8f0;
    padding-top: 12px;
}

.dark-mode .pm-subject-breakdown {
    border-color: #334155;
}

.pm-subj-row {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.pm-subj-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.pm-subj-name {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    color: #334155;
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dark-mode .pm-subj-name {
    color: #cbd5e1;
}

.pm-subj-icon {
    font-size: 0.85rem;
    flex-shrink: 0;
}

.pm-subj-count {
    font-size: 0.78rem;
    font-weight: 900;
    color: #64748b;
    flex-shrink: 0;
}

.dark-mode .pm-subj-count {
    color: #94a3b8;
}

.pm-subj-pct {
    font-size: 0.78rem;
    font-weight: 900;
    flex-shrink: 0;
    min-width: 36px;
    text-align: right;
}

.pm-subj-track {
    width: 100%;
    height: 7px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}

.dark-mode .pm-subj-track {
    background: #334155;
}

.pm-subj-fill {
    height: 100%;
    border-radius: 99px;
    width: 0%;
    transition: width 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}


/* Scrollbar del modal */
.pm-card::-webkit-scrollbar {
    width: 5px;
}

.pm-card::-webkit-scrollbar-track {
    background: transparent;
}

.pm-card::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

.dark-mode .pm-card::-webkit-scrollbar-thumb {
    background: #334155;
}

/* Dark mode adaptive contrast */
.dark-mode .btn-mark-studied {
    box-shadow: 0 10px 25px rgba(5, 150, 105, 0.4);
}

.dark-mode .btn-mark-studied.done {
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.5);
}

.dark-mode .btn-class-nav {
    background: #0f172a;
    border-color: #334155;
    color: #cbd5e1;
}

.dark-mode .btn-class-nav:hover {
    background: #172554;
    border-color: #3b82f6;
    color: #dbeafe;
}

/* =====================================================
   PÁGINA DE CONFIGURACIÓN
   ===================================================== */
.cfg-page {
    width: 100%;
    max-width: 560px;
    margin: 0 auto;
    padding: 32px 20px 60px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    font-family: 'Nunito', sans-serif;
}

/* Header */
.cfg-page-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 4px;
    margin-top: 60px;
}

.cfg-page-icon {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
}

.cfg-page-icon i {
    animation: gearSpin 8s linear infinite;
}

@keyframes gearSpin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.cfg-page-title {
    font-size: 1.6rem;
    font-weight: 900;
    color: #1e293b;
    margin: 0;
    line-height: 1.2;
}

.dark-mode .cfg-page-title {
    color: #f1f5f9;
}

.cfg-page-subtitle {
    font-size: 0.88rem;
    color: #64748b;
    margin: 2px 0 0;
    font-weight: 600;
}

.dark-mode .cfg-page-subtitle {
    color: #94a3b8;
}

/* Tarjeta de sección */
.cfg-card {
    background: #fff;
    border: 1.5px solid #e2e8f0;
    border-radius: 18px;
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.2s;
}

.cfg-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.dark-mode .cfg-card {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

/* Header de tarjeta */
.cfg-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.82rem;
    font-weight: 900;
    color: #6366f1;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.dark-mode .cfg-card-header {
    color: #a5b4fc;
}

/* Campo */
.cfg-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cfg-label {
    font-size: 0.82rem;
    font-weight: 800;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.7px;
}

.dark-mode .cfg-label {
    color: #94a3b8;
}

/* Input */
.cfg-input-row {
    position: relative;
}

.cfg-input {
    width: 100%;
    padding: 13px 52px 13px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    color: #1e293b;
    background: #f8fafc;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.cfg-input:focus {
    border-color: #6366f1;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.dark-mode .cfg-input {
    background: #0f172a;
    border-color: #334155;
    color: #f1f5f9;
}

.dark-mode .cfg-input:focus {
    border-color: #818cf8;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.cfg-char-count {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.72rem;
    color: #94a3b8;
    font-weight: 700;
    pointer-events: none;
}

/* Grid de avatares */
.cfg-avatar-grid {
    display: flex;
    gap: 16px;
}

.cfg-av-opt {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 14px 10px;
    border: 2.5px solid #e2e8f0;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    background: #f8fafc;
}

.cfg-av-opt input {
    display: none;
}

.cfg-av-opt:hover {
    border-color: #a5b4fc;
    background: #f0f0ff;
    transform: translateY(-2px);
}

.cfg-av-opt.selected {
    border-color: #6366f1;
    background: #eef2ff;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.2);
}

.dark-mode .cfg-av-opt {
    background: #0f172a;
    border-color: #334155;
}

.dark-mode .cfg-av-opt:hover {
    border-color: #818cf8;
    background: #1e1b4b;
}

.dark-mode .cfg-av-opt.selected {
    border-color: #818cf8;
    background: #1e1b4b;
}

.cfg-av-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 6px;
    box-sizing: border-box;
}

.cfg-av-blue {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border: 2px solid #93c5fd;
}

.cfg-av-pink {
    background: linear-gradient(135deg, #fce7f3, #fbcfe8);
    border: 2px solid #f9a8d4;
}

.cfg-av-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
}

.cfg-av-label {
    font-size: 0.82rem;
    font-weight: 800;
    color: #475569;
}

.dark-mode .cfg-av-label {
    color: #94a3b8;
}

.cfg-av-check {
    position: absolute;
    top: 8px;
    right: 8px;
    color: #6366f1;
    font-size: 1rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.cfg-av-opt.selected .cfg-av-check {
    opacity: 1;
}

/* Botón guardar */
.cfg-save-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 13px 24px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    font-size: 1rem;
    font-weight: 800;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.cfg-save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.cfg-feedback {
    font-size: 0.85rem;
    font-weight: 700;
    min-height: 1.2em;
    text-align: center;
    margin: 0;
    transition: opacity 0.3s;
}

/* Toggle tema */
.cfg-theme-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 4px 0;
}

.cfg-theme-info {
    display: flex;
    align-items: center;
    gap: 14px;
}

.cfg-theme-icon {
    font-size: 1.4rem;
    color: #f59e0b;
    width: 24px;
    text-align: center;
    transition: all 0.3s ease;
}

.dark-mode .cfg-theme-icon {
    color: #fbbf24;
}

.cfg-theme-name {
    display: block;
    font-weight: 800;
    color: #1e293b;
    font-size: 0.95rem;
}

.dark-mode .cfg-theme-name {
    color: #f1f5f9;
}

.cfg-theme-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: #64748b;
    margin-top: 1px;
    transition: all 0.3s;
}

.dark-mode .cfg-theme-label {
    color: #94a3b8;
}

/* Toggle switch */
.cfg-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}

.cfg-toggle-track {
    display: block;
    width: 52px;
    height: 28px;
    background: #e2e8f0;
    border-radius: 99px;
    position: relative;
    transition: background 0.3s ease;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.cfg-theme-toggle[aria-pressed="true"] .cfg-toggle-track {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.cfg-toggle-thumb {
    display: block;
    width: 22px;
    height: 22px;
    background: #fff;
    border-radius: 50%;
    position: absolute;
    top: 3px;
    left: 3px;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.cfg-theme-toggle[aria-pressed="true"] .cfg-toggle-thumb {
    transform: translateX(24px);
}

.guided-wrap {
    width: 100%;
    max-width: 1080px;
    padding: 0 12px 32px;
}

.guided-summary {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 20px;
}

.guided-kpi {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s;
}

.guided-kpi:hover {
    transform: translateY(-2px);
}

.guided-kpi-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.guided-kpi b {
    font-size: 1.6rem;
    color: #1e293b;
    line-height: 1.2;
}

.guided-kpi span {
    color: #64748b;
    font-weight: 800;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.guided-next-card {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1px solid #bae6fd;
    border-radius: 20px;
    padding: 22px;
    margin-bottom: 18px;
    box-shadow: 0 8px 20px rgba(14, 165, 233, 0.1);
    position: relative;
    overflow: hidden;
}

.guided-next-card::after {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
    pointer-events: none;
}

.guided-next-card h3 {
    margin: 0 0 8px;
    color: #0369a1;
    font-size: 1.15rem;
    font-weight: 900;
}

.guided-next-card p {
    margin: 0;
    color: #0f172a;
    font-weight: 700;
    font-size: 1.05rem;
}

.guided-next-card-time {
    border-color: #c7d2fe;
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.1);
}

.guided-next-card-time h3 {
    color: #4338ca;
}

.guided-next-btn {
    margin-top: 16px;
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 12px 20px;
    font-weight: 900;
    font-size: 0.95rem;
    cursor: pointer;
    font-family: inherit;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}

.guided-next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(14, 165, 233, 0.4);
}

.guided-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.guided-col {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    padding: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
}

.guided-col h4 {
    margin: 0 0 14px;
    color: #1e293b;
    font-size: 1.05rem;
    font-weight: 800;
}

.guided-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.guided-item {
    width: 100%;
    border: 1.5px solid #e2e8f0;
    background: #f8fafc;
    border-radius: 14px;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-family: inherit;
    border-left-width: 4px;
    transition: all 0.2s ease;
}

.guided-item-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    flex-shrink: 0;
    font-size: 0.95rem;
}

.guided-item-text {
    flex: 1;
    text-align: left;
    color: #334155;
    font-weight: 700;
    font-size: 0.92rem;
    line-height: 1.3;
}

.guided-item-arrow {
    font-size: 0.8rem;
    opacity: 0.5;
    transition: transform 0.2s;
}

.guided-item:hover {
    background: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.guided-item:hover .guided-item-arrow {
    opacity: 1;
    transform: translateX(3px);
}

.guided-empty {
    margin: 0;
    color: #64748b;
    font-weight: 700;
}

.cfg-backup-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.cfg-import-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 14px;
    border: 2px solid #cbd5e1;
    background: #ffffff;
    color: #1e293b;
    padding: 11px 18px;
    font-weight: 800;
    cursor: pointer;
}

#cfgImportBackupInput {
    display: none;
}

.cfg-backup-status {
    margin: 10px 0 0;
    color: #64748b;
    font-weight: 700;
    font-size: 0.92rem;
}

.dark-mode .guided-kpi,
.dark-mode .guided-col {
    background: #0f172a;
    border-color: #334155;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.dark-mode .guided-kpi b {
    color: #f1f5f9;
}

.dark-mode .guided-kpi span,
.dark-mode .guided-col h4,
.dark-mode .guided-item-text,
.dark-mode .guided-next-card p,
.dark-mode .guided-empty {
    color: #cbd5e1;
}

.dark-mode .guided-next-card {
    background: linear-gradient(135deg, #0c4a6e 0%, #075985 100%);
    border-color: #0284c7;
}

.dark-mode .guided-next-card h3 {
    color: #7dd3fc;
}

.dark-mode .guided-next-card-time {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
    border-color: #4f46e5;
}

.dark-mode .guided-next-card-time h3 {
    color: #a5b4fc;
}

.dark-mode .guided-item {
    background: #1e293b;
    border-color: #334155;
}

.dark-mode .guided-item:hover {
    background: #0f172a;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.dark-mode .cfg-import-btn {
    background: #0f172a;
    border-color: #334155;
    color: #cbd5e1;
}

@media (max-width: 900px) {

    .guided-summary,
    .guided-grid {
        grid-template-columns: 1fr;
    }

    .class-nav-actions {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        max-width: 560px;
        margin-bottom: 88px;
    }

    .class-nav-actions .btn-mark-studied {
        order: 1;
        grid-column: 1 / -1;
        margin-bottom: 12px;
    }

    .btn-class-prev {
        order: 2;
        grid-column: 1;
    }

    .btn-class-next {
        order: 3;
        grid-column: 2;
    }

    .btn-class-prev,
    .btn-class-next,
    .class-nav-actions .btn-mark-studied {
        justify-self: stretch;
        width: 100%;
    }

    .btn-class-nav-spacer {
        display: none;
    }
}

/* ----------------------------- */
/* Study Tools: Modals + Buttons */
/* ----------------------------- */

/* =====================================================
   ESTILOS PREMIUM PARA FLASHCARDS
   ===================================================== */

/* Contenedor de configuración inicial */
.flash-config-card {
    background: var(--sub-node-bg);
    border: 1.5px solid var(--menu-hover);
    border-radius: 24px;
    padding: 35px;
    max-width: 760px;
    margin: 40px auto;
    text-align: center;
    box-shadow: var(--shadow);
    animation: fadeInPage 0.5s ease;
}

.flash-config-row {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 25px;
    align-items: flex-end;
}

.flash-select-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    flex: 1;
    min-width: 200px;
}

.flash-select-group label {
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--card-text);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-left: 5px;
    opacity: 0.8;
}

.flash-input-styled {
    width: 100%;
    padding: 13px 18px;
    border-radius: 14px;
    border: 2px solid var(--menu-hover);
    background: var(--bg-color);
    color: var(--text-color);
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    outline: none;
    transition: all 0.25s ease;
}

.flash-input-styled:focus {
    border-color: var(--menu-accent);
    box-shadow: 0 0 0 5px rgba(37, 99, 235, 0.1);
    background: var(--sub-node-bg);
}

.btn-flash-start {
    background: linear-gradient(135deg, #6d28d9 0%, #4c1d95 100%);
    color: #fff;
    border: none;
    border-radius: 14px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 900;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 6px 20px rgba(109, 40, 217, 0.35);
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-flash-start:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 10px 30px rgba(109, 40, 217, 0.45);
}

.btn-flash-start:active {
    transform: translateY(-2px) scale(0.98);
}

/* Área de Sesión */
#flash-session-area {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 35px;
    max-width: 1150px;
    margin: 20px auto 100px;
    width: 100%;
}

@media (max-width: 900px) {

    /* El selector :not([style*="display: none"]) asegura que no forzamos la visibilidad si el JS o HTML lo tiene oculto */
    #flash-session-area:not([style*="display: none"]):not([style*="display:none"]) {
        display: flex !important;
        flex-direction: column !important;
        gap: 20px !important;
        padding: 5px !important;
        padding-bottom: 120px !important;
        width: 100% !important;
        max-width: 100% !important;
        margin: 0 !important;
        align-items: center;
    }

    .flash-sidebar {
        display: contents !important;
    }

    #flashProgressBox {
        order: -1;
        width: 100% !important;
        margin: 0 !important;
        padding: 15px !important;
    }

    #flashCardScene {
        order: 0;
        width: 100% !important;
        height: 380px !important;
        margin: 0 !important;
    }

    #flashControlsBox {
        order: 1;
        width: 100% !important;
        padding: 12px !important;
        margin: 0 !important;
    }

    .btn-flip-trigger {
        display: none !important;
    }

    .flash-action-group {
        display: flex !important;
        flex-direction: row !important;
        gap: 8px !important;
        width: 100% !important;
        justify-content: stretch;
    }

    .flash-action-group .btn-srs {
        flex: 1 !important;
        padding: 12px 2px !important;
        font-size: 0.85rem !important;
        flex-direction: column !important;
        gap: 4px !important;
        min-width: 0 !important;
    }

    .flash-action-group .btn-srs i {
        font-size: 1.1rem !important;
    }

    .flash-card-content {
        font-size: 1.35rem !important;
    }
}

/* Tarjeta Flash con efecto 3D flip */
.flash-card-scene {
    width: 100%;
    height: 420px;
    perspective: 2000px;
    cursor: pointer;
}

.flash-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
}

.flash-card-scene.flipped .flash-card-inner {
    transform: rotateY(180deg);
}

.flash-card-front,
.flash-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 45px;
    border-radius: 28px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
}

.flash-card-front {
    background: var(--sub-node-bg);
    color: var(--text-color);
}

.flash-card-back {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #1e293b;
    transform: rotateY(180deg);
}

.dark-mode .flash-card-front {
    background: #1e293b;
    border-color: #334155;
}

.dark-mode .flash-card-back {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: #f1f5f9;
    border-color: #334155;
}

.flash-card-content {
    font-size: 1.8rem;
    font-weight: 900;
    line-height: 1.45;
    word-break: break-word;
    max-width: 100%;
}

.flash-card-label {
    position: absolute;
    top: 25px;
    left: 30px;
    font-size: 0.75rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.5;
    color: var(--text-color);
}

.flash-card-hint-text {
    position: absolute;
    bottom: 25px;
    width: 100%;
    text-align: center;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--card-text);
    opacity: 0.6;
}

/* Sidebar de controles */
.flash-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.flash-stat-box {
    background: var(--sub-node-bg);
    padding: 24px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    border: 1.5px solid var(--menu-hover);
}

.flash-stat-title {
    font-size: 0.78rem;
    font-weight: 900;
    color: #6d28d9;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.flash-progress-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
}

.flash-progress-count {
    font-size: 1.25rem;
    font-weight: 900;
    color: var(--text-color);
}

.flash-progress-bar-wrap {
    height: 10px;
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    margin: 5px 0 15px;
}

.flash-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #6d28d9, #9333ea);
    width: 0%;
    border-radius: 12px;
    transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.flash-action-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-flip-trigger {
    background: var(--bg-color);
    border: 2px dashed var(--menu-hover);
    color: var(--card-text);
    border-radius: 18px;
    padding: 16px;
    font-weight: 800;
    font-size: 0.95rem;
    cursor: pointer;
    margin-bottom: 8px;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-flip-trigger:hover {
    border-color: #6d28d9;
    color: #6d28d9;
    background: rgba(109, 40, 217, 0.05);
}

.btn-srs {
    border: none;
    border-radius: 18px;
    padding: 16px;
    font-weight: 900;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: inherit;
}

.btn-srs-easy {
    background: #dcfce7;
    color: #166534;
    border: 2px solid #bbf7d0;
    box-shadow: 0 4px 10px rgba(22, 101, 52, 0.1);
}

.btn-srs-medium {
    background: #fff7ed;
    color: #9a3412;
    border: 2px solid #ffedd5;
    box-shadow: 0 4px 10px rgba(154, 52, 18, 0.1);
}

.btn-srs-hard {
    background: #fee2e2;
    color: #991b1b;
    border: 2px solid #fecaca;
    box-shadow: 0 4px 10px rgba(153, 27, 27, 0.1);
}

.dark-mode .btn-srs-easy {
    background: #064e3b;
    color: #6ee7b7;
    border-color: #065f46;
}

.dark-mode .btn-srs-medium {
    background: #7c2d12;
    color: #fdba74;
    border-color: #9a3412;
}

.dark-mode .btn-srs-hard {
    background: #450a0a;
    color: #fca5a5;
    border-color: #991b1b;
}

.btn-srs:hover {
    transform: translateY(-3px) scale(1.02);
    filter: brightness(1.02);
}

.btn-srs:active {
    transform: scale(0.96);
}

/* Stats page redesign */
.stats-page {
    width: 100%;
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
}

.stats-card {
    background: var(--sub-node-bg);
    border-radius: 24px;
    border: 1.5px solid var(--menu-hover);
    padding: 30px;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.stats-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px;
}

.stats-table th {
    text-align: left;
    padding: 15px 20px;
    font-size: 0.75rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--card-text);
    opacity: 0.7;
}

.stats-table td {
    padding: 20px;
    background: var(--bg-color);
    font-weight: 800;
    color: var(--text-color);
}

.stats-table tr td:first-child {
    border-radius: 15px 0 0 15px;
}

.stats-table tr td:last-child {
    border-radius: 0 15px 15px 0;
}

.dark-mode .stats-table td {
    background: #1e293b;
}

@media (max-width: 700px) {
    .flash-card-scene {
        height: 340px;
    }

    .flash-card-content {
        font-size: 1.4rem;
    }

    .flash-config-card {
        padding: 25px 20px;
    }

    .btn-flash-start {
        width: 100%;
        justify-content: center;
    }
}

/* Notificaciones Toast */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

#toast-container {
    position: fixed;
    bottom: 25px;
    right: 25px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

#toast-container>div {
    pointer-events: auto;
}

/* =====================================================
   FLASHCARDS DENTRO DE CLASE (class-flashcards-section)
   Usa el mismo patrón que .video-section / .unam-questions-section
   ===================================================== */

.class-flashcards-section {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    background: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 6px solid #7c3aed;
    padding: 30px 40px;
    box-sizing: border-box;
    font-family: 'Nunito', sans-serif;
    position: relative;
}

.dark-mode .class-flashcards-section {
    background: #1e293b;
    color: var(--text-color);
}

/* Header igual que .unam-header / .video-header */
.cfs-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 15px;
    margin-bottom: 25px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.cfs-header:hover {
    opacity: 0.85;
}

.cfs-header h2 {
    margin: 0;
    color: #5b21b6;
    font-size: 1.8rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 12px;
}

.cfs-header h2 i {
    color: #7c3aed;
}

.dark-mode .cfs-header h2 {
    color: var(--header-text);
}

/* Botón igual que .unam-toggle-btn pero en morado */
.cfs-toggle-btn {
    background: #ede9fe;
    color: #6d28d9;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Nunito', sans-serif;
    white-space: nowrap;
    flex-shrink: 0;
}

.cfs-toggle-btn:hover {
    background: #ddd6fe;
}

.dark-mode .cfs-toggle-btn {
    background: #3b0764;
    color: #c4b5fd;
}

.dark-mode .cfs-toggle-btn:hover {
    background: #4c0878;
}

/* Contenido colapsable */
.cfs-body {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 18px;
}

.cfs-body.open {
    display: flex;
}

/* Barra de progreso */
.cfs-progress-bar-track {
    width: 100%;
    max-width: 600px;
    height: 6px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}

.dark-mode .cfs-progress-bar-track {
    background: #334155;
}

.cfs-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #6d28d9, #a78bfa);
    border-radius: 99px;
    transition: width 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.cfs-progress-text {
    font-size: 0.82rem;
    font-weight: 800;
    color: #6d28d9;
    width: 100%;
    max-width: 600px;
    text-align: right;
    margin-top: -8px;
}

.dark-mode .cfs-progress-text {
    color: #a78bfa;
}

/* Flip card */
.cfs-scene {
    width: 100%;
    max-width: 600px;
    height: 200px;
    perspective: 1200px;
    cursor: pointer;
}

.cfs-card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 18px;
}

.cfs-card.flipped {
    transform: rotateY(180deg);
}

.cfs-card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 18px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 28px;
    text-align: center;
    overflow: hidden;
}

.cfs-card-front {
    background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
    border: 2px solid #c4b5fd;
    color: #4c1d95;
}

.dark-mode .cfs-card-front {
    background: linear-gradient(135deg, #2e1065 0%, #3b0764 100%);
    border-color: #7c3aed;
    color: #e9d5ff;
}

.cfs-card-back {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border: 2px solid #86efac;
    color: #14532d;
    transform: rotateY(180deg);
}

.dark-mode .cfs-card-back {
    background: linear-gradient(135deg, #052e16 0%, #064e3b 100%);
    border-color: #22c55e;
    color: #bbf7d0;
}

.cfs-face-label {
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.55;
    margin-bottom: 10px;
}

.cfs-face-content {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.5;
}

.cfs-tema-badge {
    position: absolute;
    top: 12px;
    right: 14px;
    background: rgba(255, 255, 255, 0.55);
    color: inherit;
    font-size: 0.65rem;
    font-weight: 900;
    padding: 3px 8px;
    border-radius: 20px;
    opacity: 0.75;
    max-width: 50%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cfs-flip-hint {
    font-size: 0.68rem;
    opacity: 0.45;
    position: absolute;
    bottom: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Controles de navegación */
.cfs-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    max-width: 600px;
}

.cfs-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: none;
    border-radius: 12px;
    padding: 10px 18px;
    font-family: 'Nunito', sans-serif;
    font-size: 0.88rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s ease;
}

.cfs-btn-nav {
    background: #f1f5f9;
    color: #475569;
}

.cfs-btn-nav:hover:not(:disabled) {
    background: #e2e8f0;
    transform: translateY(-1px);
}

.dark-mode .cfs-btn-nav {
    background: #334155;
    color: #cbd5e1;
}

.dark-mode .cfs-btn-nav:hover:not(:disabled) {
    background: #475569;
}

.cfs-btn-nav:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.cfs-btn-flip {
    background: #ede9fe;
    color: #6d28d9;
    flex: 1;
    justify-content: center;
    font-weight: 900;
}

.cfs-btn-flip:hover {
    background: #ddd6fe;
    transform: translateY(-1px);
}

.dark-mode .cfs-btn-flip {
    background: #3b0764;
    color: #c4b5fd;
}

.dark-mode .cfs-btn-flip:hover {
    background: #4c0878;
}

/* Responsive */
@media (max-width: 700px) {
    .class-flashcards-section {
        padding: 20px 20px;
    }
    .cfs-scene {
        height: 185px;
    }
    .cfs-face-content {
        font-size: 0.9rem;
    }
    .cfs-btn {
        padding: 9px 12px;
        font-size: 0.82rem;
    }
    .cfs-header h2 {
        font-size: 1.4rem;
    }
}

/* =============================================
   POMODORO TIMER WIDGET
   ============================================= */
.pomodoro-fab {
    background: #1e293b;
    transition: background 0.2s;
}
.pomodoro-fab--running { background: #dc2626; }
.pomodoro-fab:hover { background: #334155; }

.pomodoro-widget {
    position: fixed;
    bottom: 24px;
    right: 78px;
    width: 200px;
    background: #1e293b;
    color: #f1f5f9;
    border-radius: 16px;
    padding: 16px;
    z-index: 1001;
    box-shadow: 0 10px 30px rgba(0,0,0,.35);
    font-family: inherit;
}
.pomodoro-header {
    display: flex; justify-content: space-between; align-items: center;
    font-size: .75rem; font-weight: 700; opacity: .7; margin-bottom: 8px;
    text-transform: uppercase; letter-spacing: .06em;
}
.pomodoro-close {
    background: none; border: none; color: inherit; cursor: pointer; opacity: .6; font-size: .9rem;
}
.pomodoro-display {
    font-size: 2.6rem; font-weight: 900; text-align: center;
    letter-spacing: .04em; margin: 4px 0 12px;
}
.pomodoro-controls {
    display: flex; justify-content: center; gap: 12px;
}
.pomodoro-controls button {
    background: #334155; border: none; color: #f1f5f9;
    border-radius: 50%; width: 40px; height: 40px;
    font-size: 1rem; cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.pomodoro-controls button:hover { background: #475569; }
.pomodoro-cycles {
    text-align: center; font-size: .72rem; opacity: .5; margin-top: 10px;
}

/* =============================================
   STUDYTOK FILTER CHIPS
   ============================================= */
.stok-filter-bar {
    display: flex; gap: 8px; flex-wrap: nowrap; overflow-x: auto;
    padding: 9px 16px 9px 76px; position: sticky; top: 0;
    background: var(--bg-color, #f8fafc); z-index: 20;
    border-bottom: 1px solid #e2e8f0;
    scrollbar-width: none;
}
.stok-filter-bar::-webkit-scrollbar { display: none; }
@media (min-width: 769px) {
    .stok-filter-bar { padding-left: 16px; }
}
.dark-mode .stok-filter-bar { background: #0f172a; border-color: #1e293b; }

.stok-chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 99px;
    border: 1.5px solid #e2e8f0; background: transparent;
    font-size: .8rem; font-weight: 700; cursor: pointer;
    font-family: inherit; color: #64748b;
    transition: all 0.15s;
}
.stok-chip--active {
    background: #2563eb; border-color: #2563eb; color: #fff;
}
.stok-chip:hover:not(.stok-chip--active) { border-color: #94a3b8; color: #334155; }
.dark-mode .stok-chip { border-color: #334155; color: #94a3b8; }
.dark-mode .stok-chip:hover:not(.stok-chip--active) { border-color: #475569; color: #e2e8f0; }

/* =============================================
   SIMULACRO TIMER
   ============================================= */
.sim-timer-wrapper {
    position: sticky; top: 0; z-index: 50;
    background: #fff; border-radius: 0 0 12px 12px;
    padding: 10px 18px 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,.08);
    margin-bottom: 16px;
}
.dark-mode .sim-timer-wrapper { background: #1e293b; }
.sim-timer-info {
    display: flex; align-items: center; gap: 10px;
    font-weight: 800; font-size: 1rem;
}
.sim-timer-info > i { color: #2563eb; }
#sim-timer-display { font-size: 1.4rem; font-weight: 900; letter-spacing: .04em; }
.sim-timer-label { font-size: .8rem; font-weight: 600; opacity: .6; }
.sim-timer-track {
    height: 5px; background: #e2e8f0; border-radius: 99px;
    margin-top: 8px; overflow: hidden;
}
.sim-timer-bar {
    height: 100%; width: 100%; background: #2563eb;
    border-radius: 99px; transition: width 1s linear, background 0.5s;
}
.dark-mode .sim-timer-track { background: #334155; }

/* =============================================
   CLASS NOTES PANEL
   ============================================= */
.class-notes-panel {
    width: 100%; max-width: 1000px; margin: 30px auto;
    background: #ffffff; border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0,0,0,.08);
    border-top: 6px solid #f59e0b; padding: 30px 40px;
    box-sizing: border-box;
}
.dark-mode .class-notes-panel { background: #1e293b; color: var(--text-color); }


.class-notes-body {
    display: none; padding-top: 8px;
}
.class-notes-hint { display: block; font-size: .72rem; opacity: .6; font-weight: 600; margin-bottom: 10px; }
.class-notes-textarea {
    width: 100%; min-height: 120px; max-height: 400px;
    border: 1.5px solid #fde68a; border-radius: 10px;
    padding: 12px 16px; font-family: inherit; font-size: .95rem;
    background: #fffbeb; color: inherit; resize: vertical;
    line-height: 1.6; box-sizing: border-box;
}
.dark-mode .class-notes-textarea { background: #1c1a10; border-color: #78350f; }
.class-notes-textarea:focus { outline: none; border-color: #f59e0b; box-shadow: 0 0 0 3px rgba(245,158,11,.15); }

/* =====================================================
   FEATURE 1: Weakness Panel (Stats)
   ===================================================== */
.weakness-panel { margin-top: 24px; }
.weakness-title {
    font-size: .85rem; font-weight: 800; color: #64748b;
    text-transform: uppercase; letter-spacing: .06em;
    margin: 0 0 12px; display: flex; align-items: center; gap: 8px;
}
.weakness-item { margin-bottom: 12px; }
.weakness-item-header {
    display: flex; align-items: center; gap: 8px;
    font-size: .9rem; font-weight: 700; margin-bottom: 5px;
}
.weakness-pct { margin-left: auto; font-weight: 900; }
.weakness-total { font-size: .75rem; font-weight: 600; opacity: .55; }
.weakness-bar-track { height: 6px; background: #e2e8f0; border-radius: 99px; overflow: hidden; }
.dark-mode .weakness-bar-track { background: #334155; }
.weakness-bar { height: 100%; border-radius: 99px; transition: width 0.6s ease; }
.weakness-flashcard {
    display: flex; align-items: flex-start; gap: 10px;
    font-size: .85rem; padding: 8px 0; border-bottom: 1px solid #f1f5f9;
}
.dark-mode .weakness-flashcard { border-color: #1e293b; }
.weakness-empty { text-align: center; padding: 20px; color: #64748b; font-size: .9rem; }

/* =====================================================
   FEATURE 2: Daily Plan (Guided Study)
   ===================================================== */
.daily-plan-card {
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%);
    border: 1.5px solid #86efac; border-radius: 16px;
    padding: 20px 24px; margin-bottom: 24px;
}
.dark-mode .daily-plan-card { background: #0d1f13; border-color: #166534; }
.daily-plan-header {
    display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
}
.daily-plan-header h3 { margin: 0; font-size: 1.1rem; }
.daily-plan-date { margin-left: auto; font-size: .78rem; font-weight: 600; opacity: .6; text-transform: capitalize; }
.daily-plan-items { display: flex; flex-direction: column; gap: 10px; }
.daily-plan-item {
    display: flex; align-items: center; gap: 12px;
    background: rgba(255,255,255,.7); border-radius: 10px; padding: 12px 14px;
}
.dark-mode .daily-plan-item { background: rgba(255,255,255,.04); }
.daily-plan-item--done { opacity: .6; }
.daily-plan-icon { font-size: 1.2rem; flex-shrink: 0; color: #2563eb; }
.daily-plan-content { flex: 1; }
.daily-plan-item-title { font-weight: 800; font-size: .9rem; }
.daily-plan-item-sub { font-size: .78rem; opacity: .7; margin-top: 2px; }
.daily-plan-btn {
    flex-shrink: 0; background: #2563eb; color: #fff;
    border: none; border-radius: 8px; padding: 7px 14px;
    font-size: .8rem; font-weight: 800; cursor: pointer; font-family: inherit;
}
.daily-plan-btn:hover { filter: brightness(1.1); }


/* =====================================================
   FEATURE 4: Subnode Quiz Modal
   ===================================================== */
.subnode-quiz-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.5);
    z-index: 9000; display: flex; align-items: center; justify-content: center;
    padding: 20px;
}
.subnode-quiz-modal {
    background: #fff; border-radius: 20px; width: 100%; max-width: 480px;
    padding: 24px; box-shadow: 0 25px 60px rgba(0,0,0,.2);
    max-height: 80vh; display: flex; flex-direction: column;
}
.dark-mode .subnode-quiz-modal { background: #1e293b; }
.subnode-quiz-header {
    display: flex; align-items: center; justify-content: space-between;
    font-weight: 800; font-size: .95rem; margin-bottom: 12px;
}
.subnode-quiz-header button { background: none; border: none; cursor: pointer; font-size: 1.1rem; opacity: .6; color: inherit; }
.subnode-quiz-counter { font-size: .78rem; opacity: .5; margin-bottom: 16px; }
.subnode-quiz-cards { flex: 1; overflow: hidden; position: relative; min-height: 140px; }
.subnode-quiz-card {
    display: none; flex-direction: column; gap: 12px;
}
.subnode-quiz-card--active { display: flex; }
.subnode-quiz-q { font-weight: 700; font-size: .95rem; line-height: 1.5; }
.subnode-quiz-divider { border: none; border-top: 1.5px dashed #e2e8f0; }
.dark-mode .subnode-quiz-divider { border-color: #334155; }
.subnode-quiz-a { font-size: .9rem; line-height: 1.6; color: #0f766e; }
.dark-mode .subnode-quiz-a { color: #34d399; }
.subnode-quiz-nav {
    display: flex; align-items: center; justify-content: center; gap: 16px;
    margin-top: 20px;
}
.subnode-quiz-nav button {
    background: #f1f5f9; border: none; border-radius: 50%;
    width: 36px; height: 36px; cursor: pointer; font-size: .9rem;
    display: flex; align-items: center; justify-content: center; color: inherit;
}
.dark-mode .subnode-quiz-nav button { background: #334155; color: #f1f5f9; }
.subnode-quiz-nav span { font-weight: 700; font-size: .85rem; opacity: .7; }
.subnode-quiz-icon-btn {
    font-size: .7rem; opacity: .5; cursor: pointer; margin-left: 6px;
    transition: opacity 0.15s;
}
.subnode-quiz-icon-btn:hover { opacity: 1; }

/* =====================================================
   FEATURE 5: Timeline (Historia)
   ===================================================== */
.timeline-container {
    max-width: 900px; margin: 24px auto 0; width: 100%;
    background: #f8fafc; border-radius: 14px; padding: 20px 24px;
    border: 1.5px solid #e2e8f0;
}
.dark-mode .timeline-container { background: #0f172a; border-color: #1e293b; }
.timeline-header {
    font-weight: 800; font-size: .95rem; color: #b45309;
    display: flex; align-items: center; gap: 8px; margin-bottom: 20px;
}
.timeline-track {
    display: flex; flex-direction: column; gap: 0;
    border-left: 2px solid #e2e8f0; margin-left: 16px; padding-left: 20px;
}
.dark-mode .timeline-track { border-color: #334155; }
.timeline-event {
    position: relative; padding-bottom: 16px; display: flex; flex-direction: column;
}
.timeline-dot {
    position: absolute; left: -27px; top: 4px;
    width: 10px; height: 10px; border-radius: 50%;
    background: #b45309; border: 2px solid #fff; box-shadow: 0 0 0 2px #b45309;
}
.dark-mode .timeline-dot { border-color: #0f172a; }
.timeline-year { font-weight: 900; font-size: .85rem; color: #b45309; margin-bottom: 2px; }
.timeline-desc { font-size: .85rem; line-height: 1.5; color: #475569; }
.dark-mode .timeline-desc { color: #94a3b8; }

/* =====================================================
   SKIP LINK (Accesibilidad)
   ===================================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--menu-accent);
    color: #fff;
    padding: 10px 20px;
    border-radius: 0 0 10px 10px;
    font-weight: 800;
    z-index: 10000;
    transition: top 0.2s;
    text-decoration: none;
}
.skip-link:focus {
    top: 0;
}

/* Screen-reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* =====================================================
   FOCUS VISIBLE (Accesibilidad — navegación con teclado)
   ===================================================== */
.class-item:focus-visible,
.subject-item:focus-visible,
button:focus-visible,
input:focus-visible,
a:focus-visible {
    outline: 3px solid var(--menu-accent);
    outline-offset: 2px;
    border-radius: 6px;
}

/* =====================================================
   FLOATING NEXT CLASS BUTTON
   ===================================================== */
.floating-next-class {
    background: var(--menu-accent);
    display: none;
    transition: all 0.25s ease;
}
.floating-next-class.visible {
    display: flex;
}
.floating-next-class:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37,99,235,.45);
}

/* =====================================================
   CLASS QUIZ SUMMARY
   ===================================================== */
.class-quiz-summary {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    background: #ffffff;
    border-radius: 18px;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.1);
    border-top: 6px solid #10b981;
    padding: 30px 35px;
    animation: fadeInPage 0.5s ease;
}
[data-theme="dark"] .class-quiz-summary {
    background: var(--card-bg);
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.3);
}
.cqs-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}
.cqs-header i {
    font-size: 1.8rem;
}
.cqs-header h2 {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-primary, #1e293b);
    margin: 0;
}
.cqs-total {
    text-align: center;
    padding: 18px 0;
    border-bottom: 1px solid #e2e8f0;
    margin-bottom: 18px;
}
[data-theme="dark"] .cqs-total {
    border-bottom-color: #334155;
}
.cqs-total-number {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
}
.cqs-total-detail {
    font-size: 0.95rem;
    color: #64748b;
    margin-top: 4px;
    font-weight: 600;
}
.cqs-bar {
    height: 8px;
    background: #e2e8f0;
    border-radius: 8px;
    overflow: hidden;
    margin-top: 8px;
}
[data-theme="dark"] .cqs-bar {
    background: #334155;
}
.cqs-bar-total {
    height: 10px;
    max-width: 300px;
    margin: 12px auto 0;
}
.cqs-bar-fill {
    height: 100%;
    border-radius: 8px;
    transition: width 0.6s ease;
}
.cqs-breakdown {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 20px;
}
.cqs-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}
.cqs-row-label {
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--text-primary, #1e293b);
    min-width: 160px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.cqs-row-stats {
    font-size: 0.9rem;
    font-weight: 700;
    color: #64748b;
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 100px;
}
.cqs-correct {
    font-weight: 900;
    color: #10b981;
}
.cqs-pct {
    font-weight: 900;
    margin-left: 4px;
}
.cqs-row .cqs-bar {
    flex: 1;
    min-width: 80px;
}
.cqs-recommendation {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 18px;
}
.cqs-rec-good {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}
[data-theme="dark"] .cqs-rec-good {
    background: #064e3b;
    color: #6ee7b7;
}
.cqs-rec-review {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid #f59e0b;
}
[data-theme="dark"] .cqs-rec-review {
    background: #78350f;
    color: #fde68a;
}
.cqs-recommendation i {
    font-size: 1.2rem;
}
.cqs-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: var(--menu-accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 800;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    transition: all 0.2s ease;
}
.cqs-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}
@media (max-width: 600px) {
    .class-quiz-summary { padding: 20px 16px; }
    .cqs-row-label { min-width: 100%; }
    .cqs-total-number { font-size: 2.4rem; }
}

/* =====================================================
   TIMER COLOR FEEDBACK
   ===================================================== */
#sim-timer-display.timer-warning { color: #f59e0b; }
#sim-timer-display.timer-danger  { color: #dc2626; }

/* =====================================================
   SIMULACRO — DESGLOSE POR MATERIA
   ===================================================== */
.sim-breakdown {
    width: 100%;
    max-width: 500px;
    margin: 18px auto 10px;
}
.sim-breakdown-title {
    font-weight: 900;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--text-color);
}
.sim-breakdown-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    font-size: 0.85rem;
    font-weight: 700;
}
.sim-breakdown-row i {
    width: 18px;
    text-align: center;
}
.sim-breakdown-label {
    flex: 1;
    color: var(--card-text);
}
.sim-breakdown-bar-track {
    flex: 2;
    height: 7px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}
.dark-mode .sim-breakdown-bar-track {
    background: #334155;
}
.sim-breakdown-bar-fill {
    height: 100%;
    border-radius: 99px;
    transition: width 0.5s ease;
}
.sim-breakdown-score {
    min-width: 50px;
    text-align: right;
    font-weight: 900;
    font-size: 0.82rem;
}

/* =====================================================
   PREFERS-REDUCED-MOTION
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0s !important;
        transition-duration: 0.01ms !important;
    }
}