/* ============================================
   KVIZARNA - Main Stylesheet + Dark Mode
   ============================================ */

:root {
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-primary: #1e293b;
    --color-secondary: #64748b;
    --color-accent: #4f46e5;
    --color-accent-hover: #4338ca;
    --color-accent-light: #e0e7ff;
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-warning: #f59e0b;
    --color-border: #e2e8f0;
    --color-text: #1e293b;
    --color-text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.2s ease;
    --max-width: 1200px;
    --nav-height: 70px;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-primary: #f1f5f9;
    --color-secondary: #94a3b8;
    --color-accent: #818cf8;
    --color-accent-hover: #6366f1;
    --color-accent-light: #1e1b4b;
    --color-border: #334155;
    --color-text: #e2e8f0;
    --color-text-muted: #64748b;
    --color-success-light: #064e3b;
    --color-error-light: #450a0a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.6);
}

[data-theme="dark"] .navbar {
    background: rgba(15,23,42,0.92);
}

[data-theme="dark"] .quiz-card__tag--school {
    background: #422006;
    color: #fbbf24;
}

[data-theme="dark"] .quiz-card__tag--easy {
    background: #064e3b;
    color: #6ee7b7;
}

[data-theme="dark"] .quiz-card__tag--medium {
    background: #422006;
    color: #fbbf24;
}

[data-theme="dark"] .quiz-card__tag--hard {
    background: #450a0a;
    color: #fca5a5;
}

[data-theme="dark"] .question-explanation {
    background: #1e1b4b;
}

[data-theme="dark"] .footer {
    background: #020617;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    overscroll-behavior-x: none;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
    overscroll-behavior-x: none;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
    height: var(--nav-height);
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.92);
    transition: background 0.3s ease;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-accent);
    letter-spacing: -0.5px;
}

.navbar__logo-icon {
    width: 36px;
    height: 36px;
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
}

.navbar__nav {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.navbar__link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.925rem;
    color: var(--color-secondary);
    transition: var(--transition);
}

.navbar__link:hover,
.navbar__link--active {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

.navbar__right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar__hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--color-primary);
}

.navbar__hamburger svg {
    width: 24px;
    height: 24px;
}

/* Dark mode toggle */
.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--color-text);
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

/* ============================================
   BREADCRUMBS
   ============================================ */
.breadcrumbs {
    padding: 12px 0;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.breadcrumbs a {
    color: var(--color-accent);
    transition: var(--transition);
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.breadcrumbs__sep {
    margin: 0 8px;
    color: var(--color-border);
}

/* ============================================
   HERO
   ============================================ */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-accent-light);
    color: var(--color-accent);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero__title span {
    color: var(--color-accent);
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-secondary);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero__stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    margin-top: 48px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.hero__stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-accent);
}

.hero__stat-label {
    font-size: 0.85rem;
    color: var(--color-secondary);
    margin-top: 4px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn--primary {
    background: var(--color-accent);
    color: white;
    box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79,70,229,0.4);
}

.btn--outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-border);
}

.btn--outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn--sm {
    padding: 8px 18px;
    font-size: 0.85rem;
}

.btn--ghost {
    background: transparent;
    color: var(--color-secondary);
    padding: 8px 16px;
}

.btn--ghost:hover {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

.btn--icon {
    padding: 8px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Favorite button */
.btn-fav {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    padding: 4px;
    transition: var(--transition);
    opacity: 0.4;
}

.btn-fav:hover,
.btn-fav--active {
    opacity: 1;
    transform: scale(1.2);
}

/* ============================================
   SECTION TITLES
   ============================================ */
.section-title {
    font-size: 1.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-secondary);
    margin-bottom: 36px;
    font-size: 1.05rem;
}

/* ============================================
   SCHOOLS GRID
   ============================================ */
.schools-section {
    padding: 60px 0;
}

.schools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(360px, 100%), 1fr));
    gap: 16px;
}

.school-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.school-card:hover {
    border-color: var(--school-color, var(--color-accent));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.school-card__icon {
    font-size: 2.5rem;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.school-card__content {
    flex: 1;
    min-width: 0;
}

.school-card__name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--school-color, var(--color-primary));
}

.school-card__full {
    font-size: 0.85rem;
    color: var(--color-secondary);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.school-card__meta {
    display: flex;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.school-card__arrow {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    transition: var(--transition);
    flex-shrink: 0;
}

.school-card:hover .school-card__arrow {
    color: var(--school-color, var(--color-accent));
    transform: translateX(4px);
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-section {
    padding: 60px 0 80px;
}

.how-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(250px, 100%), 1fr));
    gap: 24px;
    margin-top: 36px;
}

.how-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.how-card__number {
    width: 48px;
    height: 48px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    margin: 0 auto 16px;
}

.how-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.how-card p {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

/* ============================================
   SEARCH & FILTERS
   ============================================ */
.search-section {
    padding: 40px 0;
}

.search-bar {
    display: flex;
    gap: 12px;
    max-width: 600px;
    margin: 0 auto 24px;
}

.search-bar__input {
    flex: 1;
    padding: 14px 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-surface);
    transition: var(--transition);
    color: var(--color-text);
}

.search-bar__input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.search-bar__input::placeholder {
    color: var(--color-text-muted);
}

.filters {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-chip {
    padding: 8px 20px;
    border-radius: 50px;
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    color: var(--color-secondary);
    font-family: inherit;
}

.filter-chip:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-chip--active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* ============================================
   QUIZ CARDS GRID
   ============================================ */
.quizzes-section {
    padding: 0 0 80px;
}

.quizzes-section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

.quizzes-section__title {
    font-size: 1.5rem;
    font-weight: 700;
}

.quizzes-section__count {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

.quizzes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
    gap: 20px;
}

.quiz-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.quiz-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.quiz-card__accent {
    height: 4px;
    background: var(--color-accent);
}

.quiz-card__body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.quiz-card__top-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.quiz-card__tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.quiz-card__tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 50px;
    background: var(--color-accent-light);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.quiz-card__tag--school {
    background: #fef3c7;
    color: #92400e;
}

.quiz-card__tag--difficulty {
    background: #f0fdf4;
    color: #166534;
}

.quiz-card__tag--easy {
    background: #f0fdf4;
    color: #166534;
}

.quiz-card__tag--medium {
    background: #fffbeb;
    color: #92400e;
}

.quiz-card__tag--hard {
    background: #fef2f2;
    color: #991b1b;
}

.quiz-card__title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
}

.quiz-card__desc {
    color: var(--color-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
    flex: 1;
}

.quiz-card__meta {
    display: flex;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    font-size: 0.825rem;
    color: var(--color-secondary);
    flex-wrap: wrap;
}

.quiz-card__meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.quiz-card__footer {
    padding: 16px 24px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.quiz-card__start {
    display: block;
    width: 100%;
    padding: 10px;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-align: center;
}

.quiz-card__start:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Difficulty stars */
.difficulty-stars {
    display: inline-flex;
    gap: 2px;
    font-size: 0.8rem;
}

.difficulty-stars__filled {
    color: #f59e0b;
}

.difficulty-stars__empty {
    color: var(--color-border);
}

/* Completion count */
.quiz-card__completions {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-secondary);
}

.empty-state__icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.empty-state__text {
    font-size: 1.1rem;
}

/* ============================================
   FAVORITES SECTION
   ============================================ */
.favorites-section {
    padding: 40px 0;
    display: none;
}

.favorites-section--visible {
    display: block;
}

/* ============================================
   SIDEBAR LAYOUT
   ============================================ */
.layout {
    display: flex;
    min-height: calc(100vh - var(--nav-height));
}

.sidebar {
    width: 280px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    flex-shrink: 0;
    position: sticky;
    top: var(--nav-height);
    height: calc(100vh - var(--nav-height));
    overflow-y: auto;
}

.sidebar__header {
    padding: 24px 20px 16px;
    border-bottom: 1px solid var(--color-border);
}

.sidebar__title {
    font-weight: 700;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.85rem;
}

.sidebar__nav {
    padding: 8px;
}

.sidebar__item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    margin-bottom: 2px;
}

.sidebar__item:hover {
    background: var(--color-bg);
}

.sidebar__item--active {
    font-weight: 600;
}

.sidebar__item-icon {
    font-size: 1.3rem;
}

.sidebar__item-name {
    flex: 1;
    font-size: 0.95rem;
}

.sidebar__item-badge {
    background: var(--color-bg);
    padding: 2px 10px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-secondary);
}

.sidebar__item--active .sidebar__item-badge {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

/* ============================================
   SCHOOL PAGE CONTENT
   ============================================ */
.layout__main {
    flex: 1;
    padding: 32px 40px;
    max-width: 960px;
}

.school-hero {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    padding: 32px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    border-left: 5px solid var(--color-accent);
    margin-bottom: 40px;
}

.school-hero__icon {
    font-size: 3rem;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.school-hero__name {
    font-size: 2rem;
    font-weight: 800;
}

.school-hero__full {
    color: var(--color-secondary);
    font-size: 1rem;
    margin-top: 4px;
}

.school-hero__desc {
    color: var(--color-secondary);
    margin-top: 12px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.school-hero__tags {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.school-hero__tag {
    padding: 4px 14px;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.school-quizzes__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.school-quizzes__title {
    font-size: 1.4rem;
    font-weight: 700;
}

.school-quizzes__count {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

/* School search */
.school-search {
    margin-bottom: 28px;
}

.school-search__input {
    width: 100%;
    padding: 14px 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-surface);
    transition: var(--transition);
    color: var(--color-text);
    margin-bottom: 16px;
}

.school-search__input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.school-search__input::placeholder {
    color: var(--color-text-muted);
}

.school-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.school-filters__divider {
    color: var(--color-border);
    font-size: 1.2rem;
    margin: 0 4px;
    user-select: none;
}

/* ============================================
   QUIZ DETAIL PAGE
   ============================================ */
.quiz-detail {
    max-width: 720px;
    margin: 40px auto;
    padding: 0 24px;
}

.quiz-detail__card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.quiz-detail__accent {
    height: 6px;
}

.quiz-detail__body {
    padding: 40px;
}

.quiz-detail__tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.quiz-detail__title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.quiz-detail__desc {
    color: var(--color-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 32px;
}

.quiz-detail__info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 32px;
}

.quiz-detail__info-item {
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
}

.quiz-detail__info-icon {
    font-size: 1.5rem;
}

.quiz-detail__info-label {
    font-size: 0.8rem;
    color: var(--color-secondary);
}

.quiz-detail__info-value {
    font-weight: 700;
    font-size: 1rem;
}

/* Settings */
.quiz-detail__settings {
    padding: 32px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

.quiz-detail__settings-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.setting-group {
    margin-bottom: 24px;
}

.setting-group__label {
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.setting-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    background: var(--color-surface);
}

.setting-option:hover {
    border-color: var(--color-accent);
}

.setting-option--selected {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.setting-option input[type="radio"] {
    accent-color: var(--color-accent);
    width: 18px;
    height: 18px;
}

.setting-option__text {
    flex: 1;
}

.setting-option__name {
    font-weight: 600;
    font-size: 0.95rem;
}

.setting-option__desc {
    font-size: 0.8rem;
    color: var(--color-secondary);
}

.setting-custom-time {
    display: none;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    padding-left: 46px;
}

.setting-custom-time--visible {
    display: flex;
}

.setting-custom-time input {
    width: 80px;
    padding: 8px 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    text-align: center;
    background: var(--color-surface);
    color: var(--color-text);
}

.setting-custom-time input:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* Toggle switch */
.toggle-setting {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
    background: var(--color-border);
    border-radius: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-switch--active {
    background: var(--color-accent);
}

.toggle-switch__knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
}

.toggle-switch--active .toggle-switch__knob {
    left: 25px;
}

.quiz-detail__actions {
    padding: 32px;
    display: flex;
    gap: 12px;
    justify-content: center;
}

.quiz-detail__actions .btn--primary {
    padding: 16px 48px;
    font-size: 1.1rem;
}

/* ============================================
   QUIZ PAGE
   ============================================ */
.quiz-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.quiz-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 0;
}

.quiz-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.quiz-header__info h1 {
    font-size: 1.3rem;
    font-weight: 700;
}

.quiz-header__info p {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

.quiz-header__controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--color-primary);
    padding: 8px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.quiz-timer--warning {
    color: var(--color-warning);
    background: #fffbeb;
}

.quiz-timer--danger {
    color: var(--color-error);
    background: var(--color-error-light);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.quiz-timer--hidden {
    display: none;
}

.quiz-progress {
    background: var(--color-bg);
    padding: 12px 0;
}

.quiz-progress__bar-container {
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.quiz-progress__bar {
    height: 100%;
    background: var(--color-accent);
    border-radius: 3px;
    transition: width 0.4s ease;
}

.quiz-progress__text {
    font-size: 0.85rem;
    color: var(--color-secondary);
    text-align: center;
}

.quiz-body {
    flex: 1;
    padding: 40px 0;
}

.question-card {
    max-width: 760px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.question-card__number {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.question-card__text {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 32px;
    color: var(--color-primary);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    background: var(--color-surface);
}

.option:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.option--selected {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.option--correct {
    border-color: var(--color-success) !important;
    background: var(--color-success-light) !important;
}

.option--incorrect {
    border-color: var(--color-error) !important;
    background: var(--color-error-light) !important;
}

.option--disabled {
    pointer-events: none;
    opacity: 0.7;
}

.option__letter {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
    transition: var(--transition);
}

.option--selected .option__letter {
    background: var(--color-accent);
    color: white;
}

.option--correct .option__letter {
    background: var(--color-success);
    color: white;
}

.option--incorrect .option__letter {
    background: var(--color-error);
    color: white;
}

.option__text {
    font-size: 1rem;
    line-height: 1.5;
}

.question-explanation {
    margin-top: 20px;
    padding: 16px 20px;
    background: #f0f9ff;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-accent);
    font-size: 0.9rem;
    color: var(--color-primary);
    display: none;
}

.question-explanation--visible {
    display: block;
}

.quiz-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

/* Keyboard shortcuts */
.shortcuts-hint {
    text-align: center;
    margin-top: 16px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.shortcuts-hint kbd {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: inherit;
    font-size: 0.75rem;
}

/* ============================================
   RESULTS
   ============================================ */
.results-overlay {
    display: none;
    padding: 40px 20px 60px;
}

.results-overlay--visible {
    display: block;
}

.results-overlay .container {
    display: flex;
    justify-content: center;
}

.results-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: 48px;
    max-width: 520px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-card__icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.results-card__title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.results-card__subtitle {
    color: var(--color-secondary);
    margin-bottom: 32px;
}

.results-score {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 32px;
}

.results-score__item {
    text-align: center;
}

.results-score__circle {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 8px;
}

.results-score__circle--percent {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.results-score__circle--correct {
    background: var(--color-success-light);
    color: var(--color-success);
}

.results-score__circle--wrong {
    background: var(--color-error-light);
    color: var(--color-error);
}

.results-score__label {
    font-size: 0.825rem;
    color: var(--color-secondary);
}

.results-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 32px;
    text-align: left;
}

.results-stats__item {
    padding: 12px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

.results-stats__value {
    font-weight: 700;
}

.results-card__actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.share-btn {
    padding: 8px 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.share-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.share-btn--copied {
    border-color: var(--color-success);
    color: var(--color-success);
}

/* ============================================
   HISTORY PAGE
   ============================================ */
.history-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 24px 80px;
}

.history-page__title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.history-page__subtitle {
    color: var(--color-secondary);
    margin-bottom: 32px;
}

.history-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.history-summary__card {
    padding: 20px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    text-align: center;
}

.history-summary__value {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--color-accent);
}

.history-summary__label {
    font-size: 0.8rem;
    color: var(--color-secondary);
    margin-top: 4px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.history-item:hover {
    box-shadow: var(--shadow-md);
}

.history-item__score {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
    flex-shrink: 0;
}

.history-item__score--great {
    background: var(--color-success-light);
    color: var(--color-success);
}

.history-item__score--good {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.history-item__score--poor {
    background: var(--color-error-light);
    color: var(--color-error);
}

.history-item__info {
    flex: 1;
}

.history-item__title {
    font-weight: 700;
    font-size: 1rem;
}

.history-item__meta {
    font-size: 0.8rem;
    color: var(--color-secondary);
    margin-top: 4px;
}

.history-item__date {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-align: right;
}

.history-clear {
    margin-top: 32px;
    text-align: center;
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-page {
    max-width: 760px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.about-page h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.about-page__subtitle {
    color: var(--color-secondary);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.about-section {
    margin-bottom: 40px;
}

.about-section h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.about-section p {
    color: var(--color-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 16px;
}

.about-feature {
    padding: 16px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
}

.about-feature__icon {
    font-size: 1.5rem;
}

.about-contact {
    padding: 24px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

/* ============================================
   REVIEW SECTION
   ============================================ */
.review-section {
    padding: 40px 0 60px;
    background: var(--color-bg);
}

.review-section__title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-primary);
}

.review-question {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 16px;
}

.review-question--correct { border-color: #10b981; }
.review-question--incorrect { border-color: #ef4444; }
.review-question--skipped { border-color: #f59e0b; }

.review-question__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.review-question__num {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.review-question__badge {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 50px;
}

.review-question__badge--correct { background: #d1fae5; color: #065f46; }
.review-question__badge--incorrect { background: #fee2e2; color: #991b1b; }
.review-question__badge--skipped { background: #fef3c7; color: #92400e; }

.review-question__text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.review-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.review-option--correct {
    background: #d1fae5;
    border-color: #10b981;
    color: #065f46;
    font-weight: 600;
}

.review-option--wrong-selected {
    background: #fee2e2;
    border-color: #ef4444;
    color: #991b1b;
}

.review-option__letter {
    font-weight: 700;
    min-width: 20px;
}

.review-explanation {
    margin-top: 14px;
    padding: 12px 16px;
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-accent);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-primary);
    color: #cbd5e1;
    padding: 40px 0;
    text-align: center;
    font-size: 0.9rem;
}

.footer a {
    color: var(--color-accent-light);
}

.footer__links {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 16px;
}

.footer__links a:hover {
    text-decoration: underline;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .navbar__nav {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--color-border);
        display: none;
        box-shadow: var(--shadow-lg);
    }

    .navbar__nav--open {
        display: flex;
    }

    .navbar__hamburger {
        display: block;
    }

    .hero {
        padding: 48px 0 40px;
    }

    .hero__stats {
        gap: 24px;
    }

    .quizzes-grid {
        grid-template-columns: 1fr;
    }

    .question-card {
        padding: 24px;
    }

    .results-card {
        padding: 32px 24px;
    }

    .results-score {
        gap: 16px;
    }

    .results-score__circle {
        width: 72px;
        height: 72px;
        font-size: 1.2rem;
    }

    .results-stats {
        grid-template-columns: 1fr;
    }

    .quiz-header .container {
        flex-direction: column;
        text-align: center;
    }

    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: 0;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .sidebar__nav {
        display: flex;
        overflow-x: auto;
        gap: 4px;
        padding: 8px 12px;
    }

    .sidebar__item {
        white-space: nowrap;
        border-left: none;
        border-bottom: 3px solid transparent;
        padding: 10px 14px;
    }

    .layout__main {
        padding: 24px 16px;
    }

    .school-hero {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .school-hero__tags {
        justify-content: center;
    }

    .schools-grid {
        grid-template-columns: 1fr;
    }

    .school-filters {
        gap: 6px;
    }

    .school-filters__divider {
        display: none;
    }

    .quiz-detail__info {
        grid-template-columns: 1fr;
    }

    .quiz-detail__body {
        padding: 24px;
    }

    .quiz-detail__settings {
        padding: 24px;
    }

    .about-features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero__actions {
        flex-direction: column;
        align-items: center;
    }

    .search-bar {
        flex-direction: column;
    }

    .quiz-nav {
        flex-direction: column;
        gap: 12px;
    }

    .quiz-nav .btn {
        width: 100%;
        justify-content: center;
    }

    .results-card__actions {
        flex-direction: column;
    }
}