:root {
    /* Paleta base RTVE - Modo Claro */
    --color-rtve-accent: #FF4E00;
    --color-accent-text: #ffffff;
    --color-bg: #f5f5f5;
    --color-bg-rgb: 245, 245, 245;
    /* blanco humo */
    --color-bg-alt: #ffffff;
    --color-card-bg: #ffffff;
    --color-text: #222222;
    --color-text-light: #666666;
    --color-border-soft: rgba(0, 0, 0, 0.06);
    --color-success: #00b894;
    --color-danger: #d63031;
    --color-warning: #ffcc00;
    --color-option-bg: #f5f6fa;
    --color-option-hover: #eaecef;
    --shadow-soft: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-strong: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius-card: 6px;
    --radius-btn: 20px;
    --transition-speed: 0.25s;
}

[data-theme="dark"] {
    /* Modo Oscuro RTVE */
    --color-bg: #121212;
    --color-bg-rgb: 18, 18, 18;
    /* fondo muy profundo */
    --color-bg-alt: #121212;
    --color-card-bg: #1E1E1E;
    /* tarjetas ligeramente más claras */
    --color-text: #f5f5f5;
    --color-text-light: #aaaaaa;
    --color-border-soft: rgba(255, 255, 255, 0.08);
    --color-option-bg: #1f1f1f;
    --color-option-hover: #2a2a2a;
    --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-strong: 0 4px 16px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--color-bg);
    min-height: 100vh;
    color: var(--color-text);
    display: flex;
    flex-direction: column;
}



.hidden {
    display: none !important;
}

.text-muted {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.error-msg {
    color: var(--color-danger);
    font-weight: 600;
    text-align: center;
    margin-top: 15px;
}

/* Animations */
.animation-fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

/* Header & Progress */
.header {
    position: fixed;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 1400px;
    z-index: 1000;

    /* DEGRADADO POTENTE Y MODERNO */
    /* Usamos tres paradas para crear un efecto de iluminación central */
    background: linear-gradient(135deg,
            var(--sector-dark) 0%,
            var(--sector-main) 50%,
            var(--sector-dark) 100%) !important;

    /* EFECTO CRISTAL REFORZADO */
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);

    /* Borde de luz superior (simula reflejo en el canto) */
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-top-color: rgba(255, 255, 255, 0.45);

    border-radius: 20px;

    /* SOMBRA MÁS PROFUNDA */
    /* Mezclamos una sombra negra para la base y una del color del sector para el brillo (glow) */
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.3),
        0 0 20px var(--sector-soft);

    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}


.header:hover::after {
    left: 125%;
}

[data-theme="dark"] .header {
    background: rgba(30, 30, 30, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.progress-container {
    height: 4px;
    background: rgba(0, 0, 0, 0.05);
    width: 100%;
}

[data-theme="dark"] .progress-container {
    background: rgba(255, 255, 255, 0.05);
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--sector-main, var(--color-rtve-accent)), var(--sector-dark, var(--color-rtve-accent)));
    transition: width 0.3s ease;
}

.header-content {
    padding: 10px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    /* Forzamos blanco para todo lo que no tenga color propio */
    color: #ffffff;
    gap: 16px;
    height: 64px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #ffffff;
}

h1#app-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
    /* Eliminamos el clip-text que da problemas de lectura */
    background: none;
    -webkit-background-clip: initial;
    background-clip: initial;
    -webkit-text-fill-color: #ffffff;
    color: #ffffff;

    /* Un toque de sombra suave para que la letra 'flote' */
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    white-space: nowrap;
    letter-spacing: 0.5px;
}

.header-center {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #ffffff;
}

.live-clock {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 1px;
    padding: 6px 14px;
    /* Fondo efecto cristal */
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    /* Color blanco puro para resaltar */
    color: #ffffff;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .live-clock {
    background: rgba(255, 255, 255, 0.04);
}

.mastered-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--sector-soft, rgba(255, 78, 0, 0.1));
    border: 1px solid var(--sector-soft, rgba(255, 78, 0, 0.1));
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--sector-main, var(--color-rtve-accent));
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #ffffff;
}

.timer {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    padding: 6px 12px;
    background: #111;
    color: #fff;
    border-radius: 12px;
    font-size: 0.9rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.theme-label {
    opacity: 0.85;
}

.switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 28px;
}

.switch input {
    display: none;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.18);
    transition: .4s;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
    font-size: 0.85rem;
}

.slider::before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: #ffffff;
    transition: .4s;
    border-radius: 4px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.icon-light,
.icon-dark {
    pointer-events: none;
}

.switch input:checked+.slider::before {
    transform: translateX(28px);
}

.switch input:checked+.slider {
    background-color: rgba(255, 78, 0, 0.6);
}

.stats-panel {
    display: flex;
    gap: 20px;
    background: rgba(0, 0, 0, 0.35);
    padding: 6px 16px;
    border-radius: 4px;
    font-weight: 600;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.stat {
    display: flex;
    align-items: center;
    gap: 8px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.score {
    color: #ffeaa7;
    margin-left: 10px;
    font-weight: 700;
    border-left: 2px solid rgba(255, 255, 255, 0.3);
    padding-left: 15px;
}

/* Main Container & Cards */
.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 140px 24px 80px;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

.card {
    background: var(--color-card-bg);
    border-radius: 24px;
    padding: 36px 32px;
    width: 100%;
    /* CAMBIO: Usamos --sector-soft para que la sombra sea del color del sector */
    /* El valor por defecto es un gris suave por si no hay sector cargado */
    box-shadow: 0 10px 40px var(--sector-soft, rgba(0, 0, 0, 0.1));
    border: 1px solid var(--color-border-soft);
    transition: all 0.3s ease;
}

h2 {
    margin-bottom: 20px;
    color: var(--color-rtve-accent);
    text-align: center;
    font-weight: 700;
    font-size: 1.9rem;
}

h3 {
    font-size: 1.2rem;
    color: var(--color-text);
    margin-bottom: 12px;
}

/* Setup section */
.file-drop-area {
    border: 2px dashed rgba(0, 0, 0, 0.12);
    border-radius: 16px;
    padding: 22px 18px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    background: rgba(255, 255, 255, 0.04);
    margin-bottom: 22px;
    position: relative;
}

.file-drop-area:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-rtve-accent);
}

#file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Library Grid */
.library-container {
    margin-bottom: 30px;
}

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.library-card {
    background: var(--color-card-bg);
    border-radius: 12px;
    padding: 18px 20px;
    border: 1px solid var(--color-border-soft);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow-soft);
}

.library-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.16);
}

.library-card.selected {
    /* Usamos el color del sector para el borde */
    border-color: var(--sector-main, var(--color-rtve-accent)) !important;

    /* Usamos la variable soft para que la sombra brille con el color del sector */
    box-shadow: 0 14px 28px var(--sector-soft, rgba(255, 78, 0, 0.3)) !important;

    /* Un ligero relieve para que se note cuál hemos pinchado */
    transform: translateY(-4px) scale(1.02);
}

.library-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.library-card-title {
    font-weight: 600;
    font-size: 1rem;
    word-break: break-word;
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.library-card-meta {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 15px;
    flex: 1;
}

.library-card-actions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    border-top: 1px solid var(--color-border-soft);
    padding-top: 10px;
}

.check-container {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.03);
}

.check-container input {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--color-rtve-accent);
}

[data-theme="dark"] .check-container {
    background: rgba(255, 255, 255, 0.04);
}

.btn-delete {
    background: transparent;
    border: none;
    color: var(--color-danger);
    cursor: pointer;
    font-size: 1.2rem;
    transition: transform 0.2s;
}

.btn-delete:hover {
    transform: scale(1.2);
}

/* Layout Grid config */
.config-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

@media(max-width: 768px) {
    .config-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.mode-selector,
.settings-selector {
    background: var(--color-option-bg);
    padding: 25px;
    border-radius: var(--radius-btn);
}

.radio-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 15px;
    cursor: pointer;
    font-size: 1rem;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    margin-top: 4px;
    accent-color: var(--color-rtve-accent);
    cursor: pointer;
}

.mode-desc {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

.setting-item {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-weight: 500;
}

.input-number {
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-family: inherit;
    font-size: 1rem;
    width: 100px;
}

/* Buttons */
.btn {
    display: inline-block;
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: var(--radius-btn);
    font-family: inherit;
    font-size: 1.1rem;
    /* Un poco más estilizado */
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: #b2bec3 !important;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary {
    /* Degradado tricolor potente como el header */
    background: linear-gradient(135deg,
            var(--sector-dark) 0%,
            var(--sector-main) 50%,
            var(--sector-dark) 100%) !important;

    color: #ffffff !important;

    /* Bisel de luz superior igual al header */
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.45);

    /* Sombra con efecto Glow */
    box-shadow:
        0 6px 15px rgba(0, 0, 0, 0.2),
        0 0 15px var(--sector-soft) !important;
}

/* 4. Efecto Hover para el botón */
.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    filter: brightness(1.1);
    box-shadow:
        0 10px 25px rgba(0, 0, 0, 0.3),
        0 0 25px var(--sector-soft) !important;
}

.btn-secondary {
    background: #444444;
    color: #ffffff;
    border-radius: var(--radius-btn);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.35);
}

.btn-danger {
    background: #b00020;
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(176, 0, 32, 0.5);
}

.btn-outline-small {
    width: auto;
    padding: 8px 14px;
    font-size: 0.85rem;
    border-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.2);
    background: transparent;
    color: var(--color-text);
    text-transform: none;
    letter-spacing: 0;
}

[data-theme="dark"] .btn-outline-small {
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--color-text);
}

.btn-outline-small:hover {
    background: rgba(255, 78, 0, 0.08);
    border-color: var(--color-rtve-accent);
}

.btn-outline-small.active-doubt {
    background: var(--color-warning);
    border-color: var(--color-warning);
    color: #111;
}

/* Quiz Section */
.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--color-option-bg);
    padding-bottom: 15px;
    margin-bottom: 25px;
}

.question-counter {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-light);
}

.badge {
    background: var(--color-secondary);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.question-text {
    font-size: 1.3rem;
    line-height: 1.5;
    margin-bottom: 30px;
    color: var(--color-text);
    text-align: left;
    font-weight: 600;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 35px;
}

.option {
    background: var(--color-option-bg);
    border: 2px solid transparent;
    padding: 15px 20px;
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 500;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
}

.option:hover:not(.disabled) {
    background: var(--color-option-hover);
    transform: translateX(5px);
}

.option.selected {
    border-color: var(--color-secondary);
    background: rgba(116, 185, 255, 0.1);
}

.option.correct {
    border-color: var(--color-success);
    background: rgba(0, 184, 148, 0.1);
    color: #009432;
    font-weight: 600;
}

.option.incorrect {
    border-color: var(--color-danger);
    background: rgba(214, 48, 49, 0.1);
    color: #c0392b;
    font-weight: 600;
}

.option.disabled {
    cursor: default;
}

.actions {
    display: flex;
    gap: 20px;
}

.actions .btn {
    flex: 1;
}

.question-tools {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.ia-explanation {
    margin-bottom: 20px;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 0.9rem;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid var(--color-border-soft);
}

/* =============================================================================
   SOPORTE PARA IMÁGENES EN PREGUNTAS
   ============================================================================= */

/* Contenedor que envuelve la imagen */
.question-image-container {
    width: 100%;
    display: flex;
    justify-content: center;
    /* Centra la imagen horizontalmente */
    align-items: center;
    margin: 1.5rem 0;
    /* Espacio arriba y abajo */
    background-color: rgba(0, 0, 0, 0.03);
    /* Fondo muy sutil para resaltar fotos claras */
    border-radius: 12px;
    padding: 10px;
    overflow: hidden;
}

/* La imagen propiamente dicha */
.img-fluid-exam {
    max-width: 100%;
    /* Nunca será más ancha que el móvil */
    height: auto;
    /* Mantiene la proporción */
    border-radius: 8px;
    /* Bordes redondeados */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    /* Sombra suave para dar profundidad */
    transition: transform 0.3s ease;
    /* Efecto suave si decidimos ampliarla */
    border: 1px solid var(--border-color, #ddd);
    /* Borde fino para separar del fondo */
}

/* Ajuste para modo oscuro (si el fondo es muy oscuro, bajamos un poco el brillo) */
body.dark-mode .img-fluid-exam {
    filter: brightness(0.9);
    border-color: #444;
}

/* Optimización para móviles */
@media (max-width: 600px) {
    .question-image-container {
        margin: 1rem 0;
        padding: 5px;
    }
}

[data-theme="dark"] .ia-explanation {
    background: rgba(255, 255, 255, 0.02);
}

/* Results */
/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.result-card {
    background: var(--color-option-bg);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    border: 2px solid transparent;
}

.result-card.correct {
    border-color: var(--color-success);
}

.result-card.incorrect {
    border-color: var(--color-danger);
}

.result-card.blank {
    border-color: #95a5a6;
}

.result-card-value {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 5px;
}

.result-card.correct .result-card-value {
    color: var(--color-success);
}

.result-card.incorrect .result-card-value {
    color: var(--color-danger);
}

.result-card-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.final-score-container {
    background: var(--color-rtve-accent);
    /* color: var(--color-accent-text); */
    color: #ffffff;
    /* Letra blanca */
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    margin: 20px 0;
}



.final-score-label {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    /* Un poco más de peso */
    color: #ffffff;
    /* Blanco puro */
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    /* Sombra muy sutil */
    margin-bottom: 10px;
}

.final-score-value {
    font-size: 5rem;
    /* Lo subo un poco para que impacte más */
    font-weight: 900;
    /* Máximo grosor */
    line-height: 1;
    color: #ffffff;
    /* Blanco puro */
    margin-bottom: 10px;

    /* Sombra con profundidad: esto hace que el número "salte" del fondo */
    text-shadow: 2px 3px 6px rgba(0, 0, 0, 0.3);
}

.result-feedback {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 15px;
    color: #ffffff;
    /* Blanco puro */
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

@media (max-width: 600px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

.heatmap-section {
    margin-bottom: 30px;
}

.heatmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
    gap: 4px;
    margin-top: 12px;
}

.heatmap-cell {
    aspect-ratio: 1 / 1;
    border-radius: 4px;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #111;
    background: #e0e0e0;
    position: relative;
    border: none;
    cursor: pointer;
}

.heatmap-cell.hidden-border {
    outline: none !important;
}

.heatmap-cell.heatmap-fail-1 {
    background-color: #ffcdd2;
    color: #b71c1c;
}

.heatmap-cell.heatmap-fail-2 {
    background-color: #ef9a9a;
    color: #b71c1c;
}

.heatmap-cell.heatmap-fail-4 {
    background-color: #b71c1c;
    color: #fff;
}

.heatmap-cell.heatmap-doubt::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 10px 10px 0;
    border-color: transparent #ffcc00 transparent transparent;
}

[data-theme="dark"] .heatmap-cell {
    color: #111;
}


/* Botón Ver Estadisticas Globales */
#btn-show-stats {
    background-color: #105767;
    color: #ffffff;
    border: 1px solid #ddd;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Animación elástica */
    margin-top: 20px;
    box-shadow: 0 4px 0px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}

#btn-show-stats:hover {
    background-color: #008fc3;
    color: white;
    border-color: #3bbbe9;
    transform: translateY(-5px) scale(1.03); /* Se eleva y crece un poco */
    box-shadow: 0 12px 20px rgba(60, 214, 231, 0.3); /* Sombra difusa del color del botón */
}

#btn-show-stats:active {
    transform: translateY(0) scale(0.98); /* Efecto de pulsación al hacer clic */
}

/* Botón reset estadísticas */
#btn-reset-data {
    background-color: #a9ce26;
    color: #ffffff;
    border: 1px solid #ddd;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    margin-top: 20px;
    box-shadow: 0 4px 0px rgba(0,0,0,0.1);
}

#btn-reset-data:hover {
    background-color: #e74c3c;
    color: white;
    border-color: #c0392b;
    transform: translateY(-5px) scale(1.03);
    box-shadow: 0 12px 20px rgba(231, 76, 60, 0.3);
}

#btn-reset-data:active {
    transform: translateY(0) scale(0.98);
}



/* Dual Legend */
.heatmap-legend-dual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border-soft);
}

.legend-block {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-light);
}

.legend-gradient-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.gradient-visual {
    flex: 1;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(90deg, #b71c1c, #ef9a9a, #ffcdd2, #e0e0e0, #00b894);
}

.gradient-label {
    font-size: 0.75rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.legend-desc {
    font-size: 0.75rem;
    color: var(--color-text-light);
    opacity: 0.8;
}

.legend-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
}

.swatch {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--color-option-bg);
}

.swatch.border-success {
    border: 3px solid #2ecc71;
}

.swatch.border-danger {
    border: 3px solid #e74c3c;
}

.swatch.border-info {
    border: 3px solid #3498db;
}

.swatch.border-doubt {
    position: relative;
    border: 1px solid var(--color-border-soft);
}

.swatch.border-doubt::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 8px 8px 0;
    border-color: transparent var(--color-warning) transparent transparent;
}

@media (max-width: 768px) {
    .heatmap-legend-dual {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Modal */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-backdrop.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background: var(--color-card-bg);
    width: 90%;
    max-width: 600px;
    padding: 40px;
    border-radius: 20px;
    position: relative;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-backdrop.active .modal-card {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-text-light);
    cursor: pointer;
}

.modal-q-title {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--color-rtve-accent);
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.modal-text {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 25px;
}

.modal-answer-box {
    background: rgba(0, 184, 148, 0.1);
    border-left: 4px solid var(--color-success);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.modal-answer-box strong {
    display: block;
    font-size: 0.8rem;
    color: var(--color-success);
    margin-bottom: 5px;
}

.modal-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.m-stat {
    background: var(--color-option-bg);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
}

.m-stat span {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.m-stat strong {
    font-size: 1.1rem;
}

/* Header Left (Home + Title) */
.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Botón Home */
.btn-home {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 1.1rem;
    color: white;
    text-decoration: none;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.btn-home:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.35);
    transform: scale(1.08);
}

/* Library card meta (nº preguntas) */
.library-card-meta {
    font-size: 0.82rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

/* =====================================================
   HEADER CENTER: Reloj + Píldora de aprendizaje
   ===================================================== */
.header-center {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    justify-content: center;
}

.live-clock {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 1px;
    color: rgba(255, 255, 255, 0.85);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.mastered-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    /* Usamos un verde esmeralda muy suave y traslúcido */
    background: rgba(0, 184, 148, 0.25);
    border: 1px solid rgba(0, 184, 148, 0.4);
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.9rem;
    color: #ffffff;
    /* Texto siempre blanco para leerse bien */
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.pill-icon {
    font-size: 0.9rem;
}

.pill-label {
    opacity: 0.75;
    font-weight: 400;
}

/* =====================================================
   BOTÓN MIS ERRORES (header)
   ===================================================== */
.btn-errors-header {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    /* Fondo rojizo más sólido para que destaque */
    background: rgba(214, 48, 49, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: #ffffff;
    /* Texto blanco para máximo contraste */
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.btn-errors-header:hover {
    background: #d63031;
    /* Rojo sólido al pasar el ratón */
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}

.btn-errors-header:hover {
    background: rgba(214, 48, 49, 0.3);
    border-color: #ff7979;
    transform: translateY(-1px);
}

.errors-icon {
    font-size: 0.9rem;
}

.errors-badge {
    background: #d63031;
    color: white;
    font-size: 0.7rem;
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* =====================================================
   DASHBOARD DE SECTOR
   ===================================================== */
.sector-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    background: var(--color-option-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    border: 1px solid var(--color-border-soft);
}

.dashboard-stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.dashboard-stat-label {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-light);
}

.dashboard-stat-big {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-danger);
    line-height: 1;
}

.dashboard-stat-sub {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.dashboard-stat-value {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-success);
}

.dashboard-progress-bar-wrap {
    height: 8px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 4px;
    overflow: hidden;
}

[data-theme="dark"] .dashboard-progress-bar-wrap {
    background: rgba(255, 255, 255, 0.08);
}

.dashboard-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #00b894, #00cec9);
    border-radius: 4px;
    transition: width 0.6s ease;
}

/* Top falladas */
.dash-top-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.dash-top-item {
    font-size: 0.78rem;
    color: var(--color-text);
    display: flex;
    align-items: flex-start;
    gap: 6px;
    line-height: 1.4;
}

.dash-top-score {
    background: #d63031;
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 4px;
    flex-shrink: 0;
    min-width: 24px;
    text-align: center;
}

.dash-top-empty {
    font-size: 0.85rem;
    color: var(--color-success);
    font-style: italic;
}

/* =====================================================
   MODO SUPERVIVENCIA
   ===================================================== */
.radio-survival strong {
    color: #f39c12;
}

.survival-badge {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: white;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    animation: pulse-survival 1.2s ease-in-out infinite;
}

@keyframes pulse-survival {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(243, 156, 18, 0.5);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(243, 156, 18, 0);
    }
}

.survival-result-banner {
    text-align: center;
    padding: 28px;
    background: linear-gradient(135deg, rgba(176, 0, 32, 0.1), rgba(243, 156, 18, 0.1));
    border: 1px solid rgba(176, 0, 32, 0.25);
    border-radius: 12px;
    margin-bottom: 24px;
}

.survival-result-icon {
    font-size: 3rem;
    line-height: 1;
    margin-bottom: 8px;
}

.survival-result-text {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-danger);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.survival-result-score {
    font-size: 1rem;
    color: var(--color-text-light);
    font-weight: 500;
}

/* =====================================================
   MODAL DE ESTADÍSTICAS
   ===================================================== */
/* --- MODAL DE ESTADÍSTICAS --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8) !important;
    backdrop-filter: blur(5px);
    
    /* EL CAMBIO CLAVE: Oculto por defecto */
    display: none; 
    
    align-items: center;
    justify-content: center;
    
    /* Z-index altísimo para que no lo tape el header ni otros elementos */
    z-index: 99999 !important; 
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Cuando NO tiene la clase hidden, se muestra */
.modal:not(.hidden) {
    display: flex;
    opacity: 1;
}

/* Clase de seguridad por si usas .hidden en el JS */
.modal.hidden {
    display: none !important;
    opacity: 0;
}

.modal-content {
    background: white;
    /* Forzamos el color del texto para que no herede temas oscuros por error */
    color: #222 !important; 
    width: 95%;
    max-width: 550px;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

/* Animación de entrada para el contenido */
.modal:not(.hidden) .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
}

.modal-header h2 {
    margin: 0;
    /* Usamos tu variable o un color sólido de seguridad */
    color: #222;
    font-size: 1.4rem;
    font-weight: 700;
}

.btn-close-modal {
    background: none;
    border: none;
    font-size: 2.2rem;
    cursor: pointer;
    color: #bbb;
    line-height: 1;
    padding: 0 10px;
    transition: all 0.2s;
}

.btn-close-modal:hover {
    color: #ff4e00; /* Color RTVE */
    transform: rotate(90deg);
}

/* Estilos para las tarjetas de stats dentro del modal */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.stat-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.05);
}

.stat-card.full-width {
    grid-column: span 2;
}

/* =====================================================
   HEATMAP: 4 niveles de intensidad rojo
   ===================================================== */
.heatmap-cell.heatmap-fail-1 {
    background-color: #fab1a0;
    color: #111;
}

/* -1: suave */
.heatmap-cell.heatmap-fail-2 {
    background-color: #e17055;
    color: #fff;
}

/* -2 */
.heatmap-cell.heatmap-fail-3 {
    background-color: #c0392b;
    color: #fff;
}

/* -3 */
.heatmap-cell.heatmap-fail-4 {
    background-color: #6b1c1c;
    color: #fff;
}

/* -4+: máximo */

/* Compatibilidad con clases legacy */
.heatmap-cell.heatmap-v-high-fail {
    background-color: #6b1c1c;
    color: #fff;
}

.heatmap-cell.heatmap-low-fail {
    background-color: #e17055;
    color: #fff;
}

/* Legend swatches nuevos */
.heatmap-legend-swatch.heatmap-fail-1 {
    background-color: #fab1a0;
}

.heatmap-legend-swatch.heatmap-fail-4 {
    background-color: #6b1c1c;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 768px) {

    /* 1. Contenedor principal del Header */
    .header {
        position: fixed;
        top: 10px;
        left: 50%;
        transform: translateX(-50%);
        width: 95%;
        border-radius: 20px;
        z-index: 1000;
        margin-bottom: 0;
    }

    /* 2. Configuración de las filas */
    .header-content {
        height: auto;
        padding: 8px 12px;
        display: flex;
        flex-wrap: wrap;
        /* Permite que los elementos salten a la segunda fila */
        justify-content: space-between;
        align-items: center;
        row-gap: 12px;
        /* Espacio entre la fila 1 y la fila 2 */
    }

    /* --- FILA 1: Home, Título y Modo Oscuro --- */
    .header-left {
        order: 1;
        flex: 1;
        /* Ocupa el espacio central para empujar el toggle a la derecha */
        display: flex;
        align-items: center;
        gap: 5px;
    }

    h1#app-title {
        font-size: 0.9rem;
        white-space: nowrap;
    }

    /* El selector de modo noche lo movemos a la derecha de la primera fila */
    .theme-toggle {
        order: 2;
        margin-left: auto;
    }

    .theme-label {
        display: none;
        /* Ocultamos el texto "Modo" para que quepa todo */
    }

    /* --- FILA 2: Reloj, Score diario y Mis Errores --- */
    /* Usamos el contenedor center para forzar el salto de línea con width: 100% */
    .header-center {
        order: 3;
        width: 100%;
        /* ESTO es lo que crea la segunda fila */
        display: flex;
        justify-content: flex-start;
        /* Alinea reloj y score al principio */
        gap: 8px;
        background: transparent;
        padding: 0;
    }

    /* Los errores se quedan al final de la segunda fila */
    .header-right {
        order: 4;
        margin-left: auto;
        /* Empuja el botón de errores a la derecha de la fila 2 */
        display: flex;
        align-items: center;
    }

    .question-text {
        font-size: 1.1rem !important;
        /* Estaba muy grande en tu captura */
        line-height: 1.3 !important;
        margin-bottom: 12px !important;
    }

    /* Ajustes de tamaño para que respire bien */
    .live-clock,
    .mastered-pill,
    .timer {
        font-size: 0.75rem;
        padding: 5px 10px;
    }

    .btn-mis-errores {
        font-size: 0.75rem;
        padding: 6px 12px;
    }

    /* Ocultar texto largo en botón errores */
    .btn-errors-header span:not(.errors-icon):not(.errors-badge) {
        display: none;
    }

    /* 3. Colchón de seguridad para el contenido */
    .container {
        padding-top: 165px !important;
        padding-left: 10px !important;
        padding-right: 10px !important;
    }
}


/* =====================================================
   HEATMAP HIBRIDO V7: Triangulo de DUDA
   ===================================================== */
.heatmap-cell.heatmap-doubt,
.heatmap-cell.doubt {
    position: relative;
    overflow: hidden;
}

.heatmap-cell.heatmap-doubt::after,
.heatmap-cell.doubt::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 10px 10px 0;
    border-color: transparent var(--color-warning) transparent transparent;
    pointer-events: none;
}

/* =====================================================
   RESULTS ACTIONS: botones en fila
   ===================================================== */
.results-actions {
    display: flex;
    gap: 16px;
    margin-top: 4px;
}

.results-actions .btn {
    flex: 1;
}

@media (max-width: 600px) {
    .results-actions {
        flex-direction: column;
    }
}