:root {
    --primary: #005BF6;
    --success: #B0DC35;
    --error: #FF3535;
    --warning: #F5A623;
    --bg: #fff;
    --border: #e0e0e0;
    --text: #333;
}

/* REACTIVOS Y OPCIONES */
.reactivo {
    margin-bottom: 2rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.quiz-option {
    padding: 1rem 1rem 1rem 3rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: background-color .2s ease, border-color .2s ease;
    position: relative;
    cursor: pointer;
}

.quiz-option:before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    border: 2px solid #c8c8c8;
    border-radius: 50%;
    background: #fff;
    transition: border-color .15s ease, background-color .15s ease, box-shadow .15s ease;
}

.quiz-option.selected {
    background: aliceblue;
    border-color: rgba(0, 91, 246, 0.4);
}

.quiz-option.selected:before {
    border-color: var(--primary);
    box-shadow: inset 0 0 0 4px #fff;
    background: var(--primary);
}

.quiz-option.correct {
    background: rgba(176, 220, 53, 0.1);
    border-color: var(--success);
}

.quiz-option.correct:before {
    border-color: var(--success);
    box-shadow: inset 0 0 0 4px #fff;
    background: var(--success);
}

.quiz-option.incorrect {
    background: rgba(255, 53, 53, 0.1);
    border-color: var(--error);
}

.quiz-option.incorrect:before {
    border-color: var(--error);
    box-shadow: inset 0 0 0 4px #fff;
    background: var(--error);
}

.quiz-option.disabled {
    opacity: 0.7;
}

/* BARRA INFERIOR */
.quiz-counter {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg);
    padding: 1rem;
    box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: transform .3s ease;
    display: flex;
    justify-content: center;
}

.quiz-progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    max-width: 600px;
    width: 100%;
}

.quiz-progress {
    height: 6px;
    background: #f0f0f0;
    border-radius: 3px;
    overflow: hidden;
    width: 100%;
}

.quiz-progress-bar {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width .3s ease;
}

.quiz-progress-text {
    font-size: .9rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quiz-separator {
    opacity: 0.5;
}

.quiz-footer-link {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: inherit;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: background-color .15s ease;
}

.quiz-footer-link:hover {
    background: rgba(0, 91, 246, 0.08);
}

.tiempo-bajo {
    color: var(--error);
    font-weight: bold;
}

.quiz-nav-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: #f0f4f8;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: background-color .2s ease, border-color .2s ease;
}

.quiz-nav-trigger:hover {
    background: #e4ebf1;
    border-color: #ccc;
}

.quiz-nav-trigger svg {
    opacity: 0.6;
}

/* BOTÓN COMENZAR */
.quiz-start-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    max-width: 600px;
    width: 100%;
}

.quiz-start-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 91, 246, 0.25);
    transition: background-color .2s ease;
}

.quiz-start-button:hover {
    background: #0046c3;
}

.quiz-start-button:active {
    background: #004399;
}

.quiz-start-icon {
    font-size: 0.875rem;
    margin-left: -0.25rem;
}

.quiz-start-info {
    font-size: 0.9rem;
    color: var(--text);
    opacity: 0.8;
}

/* SIDEBAR DESKTOP */
.quiz-nav-sidebar {
    position: fixed;
    top: 150px;
    right: 20px;
    bottom: 230px;
    width: 280px;
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 91, 246, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 91, 246, 0.2);
    z-index: 1001;
    display: none;
    flex-direction: column;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity .3s ease, transform .3s ease;
}

.quiz-nav-sidebar.visible {
    display: flex;
    opacity: 1;
    transform: translateX(0);
}

.quiz-nav-sidebar-header {
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.quiz-nav-sidebar-title {
    font-weight: 700;
}

.quiz-nav-sidebar-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: #888;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background-color .15s ease;
}

.quiz-nav-sidebar-close:hover {
    background: #f0f0f0;
}

.quiz-nav-sidebar-filters {
    display: flex;
    gap: 0.4rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

.quiz-nav-sidebar-filters .quiz-nav-filter {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0.5rem;
    font-size: 0.7rem;
}

.quiz-nav-sidebar-grid {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    align-content: start;
}

.quiz-nav-sidebar-grid .quiz-nav-item {
    aspect-ratio: 1;
    font-size: 0.9rem;
    border-radius: 50px;
}

/* MODAL MÓVIL */
.quiz-nav-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s ease, visibility .25s ease;
}

.quiz-nav-modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.quiz-nav-modal {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
    width: 90%;
    max-width: 480px;
    max-height: 70vh;
    display: flex;
    flex-direction: column;
    transform: translateY(-10px);
    transition: transform .25s ease;
}

.quiz-nav-modal-overlay.visible .quiz-nav-modal {
    transform: translateY(0);
}

.quiz-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.quiz-nav-title {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
}

.quiz-nav-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #888;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background-color .15s ease;
}

.quiz-nav-close:hover {
    background: #f0f0f0;
}

/* FILTROS Y GRID COMPARTIDOS */
.quiz-nav-filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.quiz-nav-filter {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: #f5f5f5;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}

.quiz-nav-filter:hover {
    background: #eee;
}

.quiz-nav-filter.active {
    background: aliceblue;
    color: var(--primary);
    border-color: rgba(0, 91, 246, 0.3);
}

.quiz-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
    gap: 0.5rem;
    overflow-y: auto;
    padding: 0.25rem;
    max-height: calc(70vh - 140px);
}

.quiz-nav-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: #fff;
    border: 1px solid var(--border);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
    cursor: pointer;
    transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
}

.quiz-nav-item:hover {
    background: #f8f9fa;
    border-color: #ccc;
    transform: scale(1.05);
}

.quiz-nav-item.respondido {
    background: aliceblue;
    border-color: var(--primary);
    color: var(--primary);
}

.quiz-nav-item.correcto {
    background: rgba(176, 220, 53, 0.15);
    border-color: var(--success);
    color: #5a8a00;
}

.quiz-nav-item.incorrecto {
    background: rgba(255, 53, 53, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.quiz-nav-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
    color: #888;
    font-size: 0.9rem;
}

/* MODAL RESULTADOS */
.quiz-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
}

.quiz-modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.quiz-modal {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    padding: 2rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    transition: transform .3s ease;
}

.quiz-modal-overlay.visible .quiz-modal {
    transform: translateY(0);
}

.quiz-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.75rem;
    background: none;
    border: none;
    cursor: pointer;
    color: #666;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color .2s ease;
}

.quiz-modal-close:hover {
    background: rgba(0, 0, 0, 0.05);
}

.quiz-modal-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.quiz-results-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.quiz-time-warning {
    color: var(--error);
    margin-bottom: 1.5rem;
    text-align: center;
}

.quiz-results-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.quiz-results-stat {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.quiz-results-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

/* RESULTADOS POR MATERIA */
.quiz-materias-section {
    margin-bottom: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.quiz-materias-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
    text-align: center;
}

.quiz-materias-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.quiz-materia-row {
    display: grid;
    grid-template-columns: 1fr auto 100px auto;
    gap: 0.75rem;
    align-items: center;
    padding: 0.6rem 0.75rem;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 3px solid transparent;
}

.quiz-materia-row.materia-bien { border-left-color: var(--success); }
.quiz-materia-row.materia-regular { border-left-color: var(--warning); }
.quiz-materia-row.materia-mal { border-left-color: var(--error); }

.quiz-materia-nombre {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.quiz-materia-stats {
    font-size: 0.85rem;
    color: #666;
    font-weight: 500;
}

.quiz-materia-barra {
    height: 6px;
    background: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
}

.quiz-materia-barra-fill {
    height: 100%;
    border-radius: 3px;
    transition: width .3s ease;
}

.materia-bien .quiz-materia-barra-fill { background: var(--success); }
.materia-regular .quiz-materia-barra-fill { background: var(--warning); }
.materia-mal .quiz-materia-barra-fill { background: var(--error); }

.quiz-materia-pct {
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 40px;
    text-align: right;
}

.materia-bien .quiz-materia-pct { color: #6a9a00; }
.materia-regular .quiz-materia-pct { color: #c98600; }
.materia-mal .quiz-materia-pct { color: var(--error); }

/* BOTONES */
.quiz-mode-button {
    display: block;
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color .2s ease;
}

.quiz-mode-button:hover {
    background: #0046c3;
}

.quiz-mode-button.secondary {
    background: #f0f0f0;
    color: var(--text);
}

.quiz-mode-button.secondary:hover {
    background: #e0e0e0;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .quiz-start-container { flex-direction: column; gap: 0.75rem; }
    .quiz-start-info { text-align: center; }
}

@media (max-width: 768px) {
    .reactivo { margin-bottom: 1.5rem; }
    .quiz-option { padding: .875rem .875rem .875rem 2.5rem; }
    .quiz-option:before { left: .75rem; width: 16px; height: 16px; }
    .quiz-results-stat { padding: 1rem; }
    .quiz-modal { padding: 1.5rem; width: 95%; max-width: 500px; }
    .quiz-nav-modal { width: 95%; padding: 1.25rem; }
    .quiz-nav-grid { grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); }
    .quiz-nav-item { font-size: 0.85rem; }
    .quiz-start-button { padding: 0.875rem 1.75rem; }
    .quiz-nav-filters { flex-wrap: wrap; }
    .quiz-nav-filter { flex: 0 0 auto; padding: 0.4rem 0.6rem; font-size: 0.75rem; }
    .quiz-materia-row { grid-template-columns: 1fr auto 60px auto; gap: 0.5rem; padding: 0.5rem 0.6rem; }
    .quiz-materia-nombre { font-size: 0.85rem; }
    .quiz-materia-stats, .quiz-materia-pct { font-size: 0.8rem; }
}

@media (max-width: 480px) {
    .quiz-modal { padding: 1rem; }
    .quiz-results-value { font-size: 1.5rem; }
    .quiz-results-summary { gap: 1rem; }
    .quiz-results-stat { padding: .75rem; }
    .quiz-modal-buttons { flex-direction: column; gap: .75rem; }
    .quiz-nav-modal { padding: 1rem; max-height: 80vh; }
    .quiz-nav-grid { grid-template-columns: repeat(auto-fill, minmax(36px, 1fr)); gap: 0.4rem; }
    .quiz-nav-item { font-size: 0.8rem; border-radius: 6px; }
    .quiz-start-button { padding: 0.75rem 1.5rem; font-size: 0.9375rem; }
    .quiz-progress-text { flex-wrap: wrap; justify-content: center; }
    .quiz-materia-row { grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 0.3rem 0.5rem; }
    .quiz-materia-nombre { grid-column: 1; grid-row: 1; }
    .quiz-materia-pct { grid-column: 2; grid-row: 1; }
    .quiz-materia-barra { grid-column: 1 / -1; grid-row: 2; width: 100%; }
    .quiz-materia-stats { display: none; }
}