/* ============================================
   ExamTopics Study App — Style Sheet
   Dark-themed, modern, offline study app
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* -- If offline, fallback to system fonts -- */

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #22263a;
    --bg-card-hover: #2a2f45;
    --bg-input: #181b26;
    --text-primary: #e8eaf0;
    --text-secondary: #9ca3b8;
    --text-muted: #6b7394;
    --accent: #6c63ff;
    --accent-hover: #7f78ff;
    --accent-glow: rgba(108, 99, 255, 0.25);
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.12);
    --success-border: rgba(34, 197, 94, 0.35);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --danger-border: rgba(239, 68, 68, 0.35);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --border: #2d3148;
    --border-light: #363b54;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s ease;
}

/* ---- Global ---- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

/* Prevent accidental text selection on UI elements for app-like feel */
button,
.nav-btn,
.mobile-nav-btn,
.logo-container,
.answer-item,
.chip {
    user-select: none;
    -webkit-user-select: none;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    padding-bottom: env(safe-area-inset-bottom);
    /* For iOS notch devices */
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ---- Layout ---- */
.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Header (Desktop) ---- */
.desktop-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, var(--text-secondary) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.desktop-nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--accent-glow);
    color: var(--accent);
}

.mobile-nav {
    display: none;
}

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

.settings-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.settings-btn.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}

.settings-btn:hover {
    background: var(--bg-card-hover);
    transform: rotate(30deg) scale(1.05);
}


/* Nav buttons in header removed */

/* ---- Section Containers ---- */
.section {
    display: none;
    padding: 24px 0 80px;
    /* Reduced top padding since header is gone */
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0;
    letter-spacing: -0.5px;
}

/* ---- Dashboard ---- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.stat-value.accent {
    color: var(--accent);
}

.stat-value.success {
    color: var(--success);
}

.stat-value.danger {
    color: var(--danger);
}

.stat-value.warning {
    color: var(--warning);
}

/* Progress bar */
.progress-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 32px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.progress-title {
    font-weight: 600;
    font-size: 1rem;
}

.progress-pct {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.progress-bar-track {
    height: 12px;
    background: var(--bg-input);
    border-radius: 6px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #a78bfa);
    border-radius: 6px;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    min-width: 0;
}

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

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-success {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}

.btn-danger {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

/* ---- Question Card ---- */
.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.question-badge {
    background: var(--accent);
    color: #fff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.question-badge.topic {
    background: rgba(108, 99, 255, 0.15);
    color: var(--accent);
}

.question-badge.flagged {
    background: var(--warning-bg);
    color: var(--warning);
}

.question-text {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 24px;
    white-space: pre-line;
}

/* Exam Images */
.in-exam-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin: 12px 0;
    display: block;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ---- Answer Options ---- */
.answers-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.answer-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 20px;
    background: var(--bg-input);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    outline: none;
    /* We use .keyboard-focus class instead */
    color: var(--text-primary);
    font-family: inherit;
    text-align: left;
    width: 100%;
}

/* Ensure nested elements cannot block clicks */
.answer-item {
    pointer-events: auto;
}

.answer-item * {
    pointer-events: none;
}

.answer-item:hover:not(.disabled),
.answer-item:focus:not(.disabled) {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
}

.answer-item.correct {
    border-color: var(--success) !important;
    background: var(--success-bg) !important;
}

.answer-item.incorrect {
    border-color: var(--danger) !important;
    background: var(--danger-bg) !important;
}

.answer-item.show-correct {
    border-color: var(--success-border);
    background: var(--success-bg);
}

.answer-item.disabled {
    cursor: default;
}

.answer-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    width: 100%;
}

.answer-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: var(--transition);
}

.answer-item.selected .answer-letter {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.answer-item.correct .answer-letter {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}

.answer-item.incorrect .answer-letter {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

.answer-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: var(--transition);
    opacity: 0.8;
}

.answer-item.selected .answer-label {
    color: var(--accent);
    opacity: 1;
}

.answer-item.correct .answer-label {
    color: var(--success);
    opacity: 1;
}

.answer-item.incorrect .answer-label {
    color: var(--danger);
    opacity: 1;
}

.answer-content {
    font-size: 0.95rem;
    line-height: 1.5;
    width: 100%;
}

.answer-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin-top: 8px;
    display: block;
}

/* ---- Feedback ---- */
.feedback-box {
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: none;
    animation: fadeIn 0.3s ease;
}

.feedback-box.show {
    display: block;
}

.feedback-box.correct {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success);
}

.feedback-box.incorrect {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger);
}

.feedback-icon {
    font-size: 1.3rem;
    margin-right: 8px;
}

.explanation-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    white-space: pre-line;
}

.explanation-box strong {
    color: var(--text-primary);
}

/* ---- Navigation Controls ---- */
.question-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    gap: 12px;
}

.question-counter {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-group {
    display: flex;
    gap: 8px;
}

/* ---- Test Setup ---- */
.test-setup {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 560px;
    margin: 0 auto;
}

.test-setup h2 {
    font-size: 1.3rem;
    margin-bottom: 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-select,
.form-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.form-select:focus,
.form-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-select option {
    background: var(--bg-secondary);
}

.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg-input);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.chip:hover {
    border-color: var(--border-light);
    color: var(--text-primary);
}

.chip.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

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

.form-actions {
    display: flex;
    justify-content: center;
    margin-top: 28px;
}

/* ---- Test Results ---- */
.test-results {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
}

.test-results h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.score-display {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -2px;
    margin: 16px 0;
}

.score-display.pass {
    color: var(--success);
}

.score-display.fail {
    color: var(--danger);
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.result-stat {
    text-align: center;
}

.result-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.result-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.wrong-questions-list {
    text-align: left;
    margin-top: 24px;
}

.wrong-questions-list h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--danger);
}

.wrong-question-item {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.wrong-question-item:hover {
    border-color: var(--border-light);
    background: var(--bg-card-hover);
}

.wrong-question-item .wq-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.wrong-question-item .wq-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.wrong-question-item .wq-answers {
    margin-top: 8px;
    font-size: 0.82rem;
}

.wq-your {
    color: var(--danger);
}

.wq-correct {
    color: var(--success);
}

/* ---- Browse ---- */
.browse-header {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.search-input {
    flex: 1;
    min-width: 220px;
    padding: 10px 16px;
    padding-left: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-wrapper {
    position: relative;
    flex: 1;
    min-width: 220px;
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

.filter-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

/* ---- Question List ---- */
.question-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.question-list-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.question-list-item:hover {
    border-color: var(--border-light);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.ql-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.82rem;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.ql-number.answered-correct {
    background: var(--success-bg);
    border-color: var(--success-border);
    color: var(--success);
}

.ql-number.answered-wrong {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger);
}

.ql-text {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ql-status {
    flex-shrink: 0;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.ql-flag {
    flex-shrink: 0;
    font-size: 1rem;
    cursor: pointer;
    opacity: 0.4;
    transition: var(--transition);
}

.ql-flag.flagged {
    opacity: 1;
}

/* ---- Multi-select info ---- */
.multi-select-hint {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--warning);
    font-weight: 500;
}

/* ---- Confirm Button ---- */
.confirm-container {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

/* ---- Empty state ---- */
.empty-state {
    text-align: center;
    padding: 64px 24px;
    color: var(--text-muted);
}

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

.empty-state-text {
    font-size: 1rem;
}

/* ---- Reset Modal ---- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.modal-overlay.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.modal-content h3 {
    margin-bottom: 12px;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* ---- Page count ---- */
.page-info {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 16px;
}

/* ---- Loading ---- */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    color: var(--text-muted);
    font-size: 1rem;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    body {
        padding-bottom: 70px;
        /* Space for bottom nav */
    }

    .desktop-header {
        display: none !important;
    }

    .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(70px + env(safe-area-inset-bottom));
        background: var(--bg-glass);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid var(--border);
        z-index: 2000;
        justify-content: space-around;
        align-items: flex-start;
        padding: 10px 10px env(safe-area-inset-bottom) 10px;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
        will-change: transform;
    }

    .mobile-nav-btn {
        background: none;
        border: none;
        color: var(--text-muted);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        font-size: 0.7rem;
        font-weight: 600;
        transition: var(--transition);
        cursor: pointer;
        outline: none;
        padding: 8px;
        border-radius: 12px;
    }

    .mobile-nav-btn.active {
        color: var(--accent);
    }

    .mobile-nav-btn .icon {
        font-size: 1.4rem;
    }

    .app-container {
        padding: 16px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .question-card {
        padding: 20px;
        border-radius: var(--radius-sm);
        /* Changed from var(--radius-md) as it's not defined */
    }

    .question-text {
        font-size: 1.1rem;
    }

    .answer-item {
        padding: 18px 20px;
        /* Larger touch area */
    }

    .answer-content {
        font-size: 1.05rem;
    }

    /* Fixed thumb nav for question navigation */
    .question-nav {
        flex-direction: column;
        gap: 12px;
    }

    .question-nav .btn {
        width: 100%;
        padding: 16px;
        font-size: 1rem;
    }

    /* Code block overflow handling for mobile */
    pre,
    code {
        max-width: 100%;
        overflow-x: auto;
        white-space: pre;
        padding: 12px;
    }

    /* Install Hint Styling */
    .install-hint {
        background: var(--bg-glass);
        border: 1px solid var(--accent);
        border-radius: var(--radius-md);
        padding: 16px;
        margin-bottom: 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        animation: slideIn 0.3s ease-out;
    }

    .hint-content {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .hint-icon {
        font-size: 1.5rem;
    }

    .hint-text {
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    .hint-text strong {
        color: var(--text-primary);
        font-size: 0.95rem;
    }

    .hint-text span {
        color: var(--text-muted);
        font-size: 0.8rem;
    }

    .hint-close {
        background: none;
        border: none;
        color: var(--text-muted);
        font-size: 1.2rem;
        cursor: pointer;
        padding: 4px;
    }

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

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

@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        height: auto;
        padding: 12px 16px;
        gap: 8px;
    }

    nav {
        width: 100%;
        overflow-x: auto;
        justify-content: center;
    }

    nav button {
        padding: 6px 12px;
        font-size: 0.82rem;
    }

    .app-container {
        padding: 0 16px;
    }

    .question-card {
        padding: 20px;
    }

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

    .browse-header {
        flex-direction: column;
    }

    .test-setup {
        padding: 24px 20px;
    }
}