styles.css

/* ===== CSS Custom Properties / Themes ===== */
:root {
    /* Shared values */
    --radius: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Dark Theme (default) */
[data-theme="dark"] {
    --bg-primary: #0a0a0b;
    --bg-secondary: #141416;
    --bg-card: #1c1c1f;
    --bg-card-hover: #242428;
    --text-primary: #ffffff;
    --text-secondary: #8b8b8b;
    --text-muted: #5a5a5a;
    --accent: #22c55e;
    --accent-light: #4ade80;
    --accent-dark: #16a34a;
    --accent-glow: rgba(34, 197, 94, 0.2);
    --danger: #ef4444;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    --gradient-card: linear-gradient(145deg, #1f1f23, #18181b);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #fafafa;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent: #16a34a;
    --accent-light: #22c55e;
    --accent-dark: #15803d;
    --accent-glow: rgba(22, 163, 74, 0.15);
    --danger: #dc2626;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.12);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px var(--accent-glow);
    --gradient-card: linear-gradient(145deg, #ffffff, #f8f8f8);
}

/* ===== Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 20px;
    padding-top: max(24px, env(safe-area-inset-top, 24px));
    padding-bottom: env(safe-area-inset-bottom, 20px);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

/* ===== App Container ===== */
.app {
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex: 1; /* Sticky footer: push footer to bottom */
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Header ===== */
header {
    text-align: center;
    padding: 0 8px;
}

.header-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    position: relative;
    padding-right: 52px; /* Space for theme toggle */
    padding-left: 52px; /* Balance */
}

header h1 {
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.theme-toggle:hover {
    transform: scale(1.05);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    font-size: 1.25rem;
    position: absolute;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .theme-icon.sun {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

[data-theme="dark"] .theme-icon.moon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-icon.sun {
    opacity: 1;
    transform: rotate(0) scale(1);
}

[data-theme="light"] .theme-icon.moon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

/* ===== Progress & Stats ===== */
.progress-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.progress-bar {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 100px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 100px;
    transition: width var(--transition-slow);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.stats {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.stat {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.stat-score {
    position: relative;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.streak {
    position: absolute;
    right: -28px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    animation: pulse 0.5s ease;
}

@keyframes pulse {
    0%, 100% { transform: translateY(-50%) scale(1); }
    50% { transform: translateY(-50%) scale(1.3); }
}

/* ===== Card ===== */
.card-container {
    perspective: 1200px;
    height: 340px;
    touch-action: manipulation;
}

.card {
    width: 100%;
    height: 100%;
    cursor: pointer;
    position: relative;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
    overflow: hidden;
}

.card:hover .card-front,
.card:hover .card-back {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card:active .card-inner {
    transform: scale(0.98);
}

.card.flipped:active .card-inner {
    transform: rotateY(180deg) scale(0.98);
}

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

.card-label {
    position: absolute;
    top: 16px;
    left: 16px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.category-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.card-front h2 {
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 20%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hint {
    color: var(--text-muted);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hint::before {
    content: '↻';
    font-size: 1rem;
    animation: wiggle 2s ease-in-out infinite;
}

@keyframes wiggle {
    0%, 100% { transform: rotate(-10deg); }
    50% { transform: rotate(10deg); }
}

.hint-tap { display: none; }
.hint-desktop { display: inline; }

.card-back-content {
    max-height: 100%;
    overflow-y: auto;
}

.card-back p {
    font-size: 1.1rem;
    line-height: 1.65;
    color: var(--text-primary);
}

.card-back .example {
    margin-top: 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-style: italic;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
}

/* ===== Controls ===== */
.controls {
    display: flex;
    gap: 12px;
}

.btn {
    flex: 1;
    padding: 18px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-icon {
    font-size: 1.1rem;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: scale(1.15);
}

.btn-skip {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-skip:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.btn-skip:active {
    transform: translateY(0);
}

.btn-knew {
    background: linear-gradient(135deg, var(--accent-dark), #0d7a32);
    color: #ffffff;
    box-shadow: var(--shadow-sm), 0 4px 20px var(--accent-glow);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    font-weight: 700;
}

.btn-knew:hover {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 8px 30px var(--accent-glow);
    color: #ffffff;
}

.btn-knew:active {
    transform: translateY(0);
}

/* ===== Categories ===== */
.categories {
    text-align: center;
}

.category-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 14px;
}

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

.category-btn {
    padding: 10px 18px;
    border: 1px solid var(--border);
    border-radius: 100px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.category-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.category-btn:active {
    transform: translateY(0);
}

.category-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    box-shadow: 0 2px 12px var(--accent-glow);
}

/* ===== App Footer (controls) ===== */
footer:not(.site-footer) {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.footer-divider {
    color: var(--text-muted);
}

.btn-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

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

.link-icon {
    font-size: 1rem;
    transition: transform var(--transition-fast);
}

.btn-link:hover .link-icon {
    transform: rotate(15deg);
}

/* ===== Site Footer (Mahope) ===== */
.site-footer {
    width: 100%;
    text-align: center;
    padding: 24px 20px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    margin-top: 32px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0; /* Don't shrink footer */
}

.site-footer p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin: 0;
    width: 100%;
}

.site-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    padding: 2px 6px;
    border-radius: 4px;
}

.site-footer a:hover {
    color: var(--accent-light);
    background: var(--accent-glow);
}

.site-footer a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Keyboard hints */
.keyboard-hints {
    display: none;
    justify-content: center;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.keyboard-hints span:first-child {
    width: 100%;
    text-align: center;
    margin-bottom: 4px;
}

kbd {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 8px;
    font-family: inherit;
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* ===== Animations ===== */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% { transform: scale(0.9); opacity: 0; }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); opacity: 1; }
}

.card-container {
    animation: slideInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-container.animate-next {
    animation: slideInUp 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Success animation */
@keyframes successPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.btn-knew.success {
    animation: successPop 0.3s ease;
}

/* ===== Responsive Design ===== */

/* Mobile (small) - 380px og ned */
@media (max-width: 380px) {
    body {
        padding: 20px 16px;
    }
    
    .app {
        gap: 24px;
    }
    
    header {
        padding: 0 8px;
        margin-bottom: 8px;
    }
    
    header h1 {
        font-size: 1.4rem;
    }
    
    .subtitle {
        font-size: 0.85rem;
        margin-top: 6px;
    }
    
    .card-container {
        height: 280px;
    }
    
    .card-front,
    .card-back {
        padding: 28px 24px;
    }
    
    .card-front h2 {
        font-size: 1.8rem;
        margin-bottom: 16px;
        line-height: 1.2;
    }
    
    .card-label {
        font-size: 0.65rem;
        padding: 6px 10px;
        top: 14px;
        left: 14px;
    }
    
    .category-badge {
        font-size: 0.6rem;
        padding: 6px 10px;
        top: 14px;
        right: 14px;
    }
    
    .card-back p {
        font-size: 1rem;
        line-height: 1.7;
    }
    
    .card-back .example {
        font-size: 0.9rem;
        margin-top: 16px;
        padding: 12px 14px;
    }
    
    .btn {
        padding: 18px 16px;
        min-height: 56px;
    }
    
    .btn-text {
        font-size: 0.9rem;
    }
    
    .stats {
        gap: 40px;
    }
    
    .stat-value {
        font-size: 1.6rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }
    
    .progress-container {
        gap: 14px;
    }
    
    .category-btn {
        padding: 12px 18px;
        font-size: 0.8rem;
    }
    
    .categories {
        padding: 0 8px;
        margin-top: 8px;
    }
    
    .category-label {
        margin-bottom: 16px;
    }
    
    .category-buttons {
        gap: 10px;
    }
    
    .controls {
        gap: 12px;
    }
    
    .hint {
        font-size: 0.8rem;
    }
}

/* Mobile (default) - 600px og ned */
@media (max-width: 600px) {
    body {
        padding: 24px 20px;
    }
    
    .app {
        gap: 28px;
    }
    
    header {
        padding: 0 8px;
        margin-bottom: 4px;
    }
    
    .subtitle {
        margin-top: 8px;
    }
    
    .card-container {
        height: 320px;
    }
    
    .card-front,
    .card-back {
        padding: 32px 28px;
    }
    
    .card-front h2 {
        font-size: 2rem;
        line-height: 1.15;
    }
    
    .card-back p {
        font-size: 1.05rem;
        line-height: 1.7;
    }
    
    .card-back .example {
        margin-top: 20px;
        padding: 14px 16px;
    }
    
    .hint-tap { display: inline; }
    .hint-desktop { display: none; }
    
    .keyboard-hints {
        display: none !important;
    }
    
    .category-buttons {
        gap: 12px;
        padding: 0 8px;
    }
    
    .category-btn {
        padding: 14px 20px;
    }
    
    .controls {
        gap: 14px;
        padding: 0 8px;
    }
    
    .btn {
        padding: 20px 22px;
        min-height: 60px;
    }
    
    .site-footer {
        margin-top: 24px;
        padding: 20px 16px;
    }
    
    .stats {
        gap: 48px;
    }
    
    footer:not(.site-footer) {
        gap: 20px;
        margin-top: 4px;
    }
    
    .btn-link {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
}

/* Tablet */
@media (min-width: 600px) and (max-width: 1024px) {
    
    .app {
        max-width: 560px;
    }
    
    .card-container {
        height: 380px;
    }
    
    .card-front h2 {
        font-size: 3rem;
    }
    
    .keyboard-hints {
        display: flex;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    body {
        padding: 40px;
    }
    
    .app {
        max-width: 600px;
        gap: 28px;
    }
    
    .card-container {
        height: 400px;
    }
    
    .card-front,
    .card-back {
        padding: 36px;
    }
    
    .card-front h2 {
        font-size: 3.5rem;
    }
    
    .btn {
        padding: 20px 32px;
    }
    
    .keyboard-hints {
        display: flex;
    }
}

/* Large Desktop */
@media (min-width: 1400px) {
    .app {
        max-width: 680px;
    }
    
    .card-container {
        height: 440px;
    }
}

/* Hover states only on devices with hover */
@media (hover: hover) {
    .card:hover {
        cursor: pointer;
    }
}

/* Touch devices */
@media (pointer: coarse) {
    .btn {
        min-height: 54px;
    }
    
    .category-btn {
        min-height: 44px;
    }
    
    .theme-toggle {
        width: 48px;
        height: 48px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .card-inner {
        transition: none;
    }
}

/* Print */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .controls,
    .categories,
    footer,
    .theme-toggle,
    .keyboard-hints {
        display: none;
    }
}

/* ===== NEW PAGES STYLES ===== */

/* Main Navigation */
.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    margin: -24px -20px 24px -20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
    gap: 12px;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .main-nav {
    background: rgba(20, 20, 22, 0.85);
}

[data-theme="light"] .main-nav {
    background: rgba(255, 255, 255, 0.85);
}

.nav-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    margin-left: -12px;
}

.nav-logo:hover {
    color: var(--accent);
    background: var(--accent-glow);
    transform: translateY(-1px);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 4px;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links li a {
    padding: 8px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-links li a:hover {
    color: var(--text-primary);
    background: var(--bg-card);
    transform: translateY(-1px);
}

.nav-links li a.active {
    color: var(--accent);
    background: var(--accent-glow);
    font-weight: 600;
}

.nav-links li a.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
    border-radius: 1px;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .main-nav {
        padding: 10px 16px;
        margin: -24px -20px 20px -20px;
    }

    .nav-logo {
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 2px;
        padding: 16px 0 8px 0;
        order: 3;
        border-top: 1px solid var(--border);
        margin-top: 8px;
    }

    .nav-links.open {
        display: flex;
        animation: slideDown 0.2s ease;
    }

    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-10px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .nav-links li a {
        display: block;
        padding: 14px 16px;
        border-radius: var(--radius-sm);
        font-size: 0.95rem;
    }

    .nav-links li a.active::after {
        display: none;
    }

    .main-nav {
        position: relative;
    }

    .main-nav .theme-toggle {
        position: static;
    }
}

/* Page Content Layout */
.page-content {
    max-width: 800px;
}

.page-content header {
    text-align: left;
    padding: 0;
}

.content-section {
    padding: 0;
}

.content-section h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-text {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

/* Content Blocks */
.content-block {
    margin-bottom: 48px;
}

.content-block h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.content-block h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.content-block p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.content-block a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.content-block a:hover {
    text-decoration: underline;
}

/* Fix: Buttons should not inherit content-block link styling */
.content-block a.btn,
.content-block a.btn-knew,
.cta-buttons a.btn,
.cta-block a.btn {
    text-decoration: none;
}

.content-block a.btn-knew,
.cta-buttons a.btn-knew,
.cta-block a.btn-knew {
    color: #ffffff !important;
    -webkit-text-fill-color: #ffffff !important;
    background: linear-gradient(135deg, var(--accent-dark), #0d7a32);
}

/* Feature List */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.6;
    border-bottom: 1px solid var(--border);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 18px;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
}

/* Numbered List */
.numbered-list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: list-counter;
}

.numbered-list li {
    padding: 16px 0;
    padding-left: 48px;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.6;
    border-bottom: 1px solid var(--border);
    counter-increment: list-counter;
}

.numbered-list li::before {
    content: counter(list-counter);
    position: absolute;
    left: 0;
    top: 16px;
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Two Columns */
.two-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.column-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
}

.column-card h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.column-card p {
    margin-bottom: 0;
}

/* CTA Block */
.cta-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
}

.cta-block h2 {
    margin-bottom: 12px;
}

.cta-block p {
    margin-bottom: 24px;
}

.cta-block .btn {
    display: inline-flex;
}

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

/* Search & Filter */
.search-filter-container {
    margin-bottom: 32px;
}

.search-box {
    position: relative;
    margin-bottom: 16px;
}

.search-box input {
    width: 100%;
    padding: 16px 20px;
    padding-left: 48px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

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

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

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    padding: 10px 18px;
    border: 1px solid var(--border);
    border-radius: 100px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: #ffffff;
    font-weight: 600;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.15);
}

/* Terms Grid */
.terms-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.term-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.term-card:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
}

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

.term-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.term-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 4px 10px;
    border-radius: 100px;
    white-space: nowrap;
}

.term-content {
    display: none;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.term-card.expanded .term-content {
    display: block;
}

.term-definition {
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.term-example {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.95rem;
    padding: 12px 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
    margin: 0;
}

.no-results {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}

/* Categories Grid */
.categories-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--transition-fast);
}

.category-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.category-card h2 {
    font-size: 1.35rem;
    margin-bottom: 8px;
}

.category-count {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
}

.category-description {
    margin-top: 12px;
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.category-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 20px;
}

.category-examples span:first-child {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-right: 4px;
}

.example-tag {
    font-size: 0.8rem;
    padding: 4px 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text-secondary);
}

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

.category-actions .btn {
    flex: 1;
    min-width: 140px;
    text-align: center;
    text-decoration: none;
}

/* Halls Grid */
.halls-grid {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.city-section {
    margin-bottom: 16px;
}

.city-heading {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
}

.halls-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.hall-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: all var(--transition-fast);
}

.hall-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hall-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}

.hall-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.hall-type {
    font-size: 0.7rem;
    padding: 4px 10px;
    border-radius: 100px;
    white-space: nowrap;
}

.hall-type.type-boulder {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent);
}

.hall-type.type-lead {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.hall-type.type-both {
    background: rgba(168, 85, 247, 0.15);
    color: #a855f7;
}

.hall-area {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.hall-address {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.hall-link {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.hall-link:hover {
    text-decoration: underline;
}

/* Article Content */
.article-content h1 {
    margin-bottom: 20px;
}

.article-content section {
    margin-bottom: 48px;
}

/* Table of Contents */
.toc {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 40px;
}

.toc h2 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.toc ol {
    margin: 0;
    padding-left: 24px;
}

.toc li {
    margin-bottom: 8px;
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.toc a:hover {
    color: var(--accent);
}

/* Comparison Table */
.comparison-table {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: 24px 0;
}

.comparison-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    border-bottom: 1px solid var(--border);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row.header {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-row div {
    padding: 14px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.comparison-row div:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.comparison-row div:not(:last-child) {
    border-right: 1px solid var(--border);
}

@media (max-width: 600px) {
    .comparison-table {
        font-size: 0.8rem;
    }
    
    .comparison-row div {
        padding: 10px 8px;
    }
}

/* Grade List */
.grade-list {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.grade-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.grade-list li:last-child {
    border-bottom: none;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-list details {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0;
    overflow: hidden;
}

.faq-list summary {
    padding: 16px 20px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.faq-list summary:hover {
    background: var(--bg-card-hover);
}

.faq-list details[open] summary {
    border-bottom: 1px solid var(--border);
}

.faq-list details p {
    padding: 16px 20px;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Equipment Grid */
.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.equipment-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
}

.equipment-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 12px;
}

.equipment-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.equipment-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* Tip Cards */
.tip-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.tip-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    position: relative;
}

.tip-number {
    position: absolute;
    top: -12px;
    left: 20px;
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.tip-card h4 {
    margin-top: 8px;
    margin-bottom: 12px;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.tip-card p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Warning Box */
.warning-box {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    padding: 20px;
    margin: 24px 0;
}

.warning-box h4 {
    color: var(--danger);
    margin-bottom: 8px;
}

.warning-box p {
    margin: 0;
    color: var(--text-secondary);
}

/* Term Preview */
.term-preview {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.term-preview li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.inline-link {
    display: inline-block;
    margin-top: 8px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.inline-link:hover {
    text-decoration: underline;
}

/* Progression Timeline */
.progression-timeline {
    margin: 24px 0;
    padding-left: 20px;
    border-left: 2px solid var(--accent);
}

.timeline-item {
    padding: 16px 0 16px 20px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -9px;
    top: 22px;
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 3px solid var(--accent);
    border-radius: 50%;
}

.timeline-label {
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 4px;
}

.timeline-item p {
    margin: 0;
    color: var(--text-secondary);
}

/* Beginner Terms */
.beginner-terms {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 20px;
}

.beginner-term-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
}

.beginner-term-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    margin: 0 0 12px 0;
}

.beginner-term-card .term-def {
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.beginner-term-card .term-example {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.9rem;
    padding: 12px 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
    margin: 0;
}

/* Enhanced Site Footer */
.site-footer {
    border-top: 1px solid var(--border);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

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

/* Header Content for Index */
.header-content {
    text-align: center;
    padding: 0 8px;
}

.header-content h1 {
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}