/* ===== Featured Button ===== */
.featured-btn-wrapper {
    position: fixed;
    top: 100px;
    right: 24px;
    z-index: 999;
}

.featured-btn {
    position: relative;
    display: inline-block;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #ee3c95, #f6a71d, #9b31fd);
    background-size: 200% 200%;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(236, 72, 153, 0.4);
    animation: gradientShift 3s ease infinite;
    overflow: hidden;
    transition: all 0.3s ease;
}

.featured-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(236, 72, 153, 0.5);
}

.featured-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shine 2s infinite;
}

@keyframes shine {
    0% { left: -100%; }
    50%, 100% { left: 100%; }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.featured-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 8px;
    min-width: 260px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.featured-btn-wrapper:hover .featured-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.featured-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 24px;
    width: 16px;
    height: 16px;
    background: var(--bg-card);
    border-left: 1px solid var(--border-light);
    border-top: 1px solid var(--border-light);
    transform: rotate(45deg);
}

.featured-dropdown-item {
    display: grid;
    grid-template-columns: 32px 1fr;
    grid-template-rows: auto auto;
    gap: 2px 12px;
    padding: 12px;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.2s ease;
}

.featured-dropdown-item:hover {
    background: var(--bg-hover);
}

.featured-icon {
    grid-row: span 2;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.featured-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.featured-desc {
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .featured-btn-wrapper {
        top: 100px;
        right: 16px;
    }
    
    .featured-btn {
        padding: 8px 18px;
        font-size: 13px;
    }
    
    .featured-dropdown {
        right: -10px;
        min-width: 240px;
    }
}

/* ===== Featured Page Styles ===== */
.featured-tag {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.2), rgba(168, 85, 247, 0.2));
    border: 1px solid rgba(236, 72, 153, 0.4);
    color: #f472b6;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 48px;
}

.featured-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    text-decoration: none;
    transition: all 0.4s ease;
}

.featured-card:hover {
    transform: translateY(-8px);
    border-color: transparent;
}

.featured-card-glow {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.4s ease;
    border-radius: var(--radius-xl);
}

.featured-card:hover .featured-card-glow {
    opacity: 1;
}

.limit-card .featured-card-glow {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(245, 158, 11, 0.05));
    box-shadow: 0 0 40px rgba(251, 191, 36, 0.2), inset 0 0 40px rgba(251, 191, 36, 0.05);
}

.limit-card:hover {
    border-color: rgba(251, 191, 36, 0.5);
}

.mathclub-card .featured-card-glow {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.05));
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.2), inset 0 0 40px rgba(99, 102, 241, 0.05);
}

.mathclub-card:hover {
    border-color: rgba(99, 102, 241, 0.5);
}

.notes-card .featured-card-glow {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(168, 85, 247, 0.05));
    box-shadow: 0 0 40px rgba(236, 72, 153, 0.2), inset 0 0 40px rgba(236, 72, 153, 0.05);
}

.notes-card:hover {
    border-color: rgba(236, 72, 153, 0.5);
}

.featured-card-content {
    position: relative;
    padding: 32px;
    z-index: 1;
}

.featured-card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.featured-card-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.featured-card-subtitle {
    font-size: 14px;
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: 16px;
}

.featured-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.featured-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.featured-tag-item {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border-radius: 50px;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

.featured-card-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-secondary);
    transition: color 0.2s ease;
}

.featured-card:hover .featured-card-link {
    color: var(--accent-primary);
}

@media (max-width: 1024px) {
    .featured-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
}

/* ===== Featured Communities Buttons ===== */
.featured-communities {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin: 32px 0 0 0;
    flex-wrap: wrap;
}
.community-btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-md);
    transition: all 0.2s;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 2px 8px rgba(99,102,241,0.07);
}
.community-btn:hover {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(99,102,241,0.15);
}

/* ===== Explore Page Stats ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--border-light);
    transform: translateY(-4px);
}

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

.stat-card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.chart-container {
    width: 100%;
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bar-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
}

.linux-bar {
    cursor: pointer;
}

.linux-bar:hover .bar-fill {
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

/* Linux Distro Popup */
.distro-popup {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 20px;
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.linux-bar:hover .distro-popup {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.distro-popup::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 30px;
    width: 16px;
    height: 16px;
    background: var(--bg-card);
    border-left: 1px solid var(--border-light);
    border-top: 1px solid var(--border-light);
    transform: rotate(45deg);
}

.distro-popup-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

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

.distro-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: background 0.2s ease;
}

.distro-item:hover {
    background: var(--bg-hover);
}

.distro-logo {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.distro-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.distro-percent {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-secondary);
    font-family: var(--font-mono);
}

.bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: 4px;
}

.os-name {
    color: var(--text-secondary);
    font-weight: 500;
}

.os-percent {
    color: var(--accent-secondary);
    font-weight: 600;
    font-family: var(--font-mono);
}

.bar-fill {
    height: 32px;
    background: var(--bar-color);
    border-radius: var(--radius-sm);
    width: 0;
    animation: fillBar 1.5s ease-out forwards;
    animation-delay: 0.2s;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

@keyframes fillBar {
    from { width: 0; }
    to { width: var(--bar-width); }
}

.lang-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.lang-item {
    display: grid;
    grid-template-columns: 100px 1fr 60px;
    align-items: center;
    gap: 12px;
}

.lang-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.lang-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.lang-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: fillBar 1.2s ease-out forwards;
}

.lang-percent {
    font-size: 13px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    text-align: right;
}

.tools-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tool-badge {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: default;
}

.tool-badge:hover {
    background: var(--accent-glow);
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
}

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

.editor-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.editor-item:hover {
    background: var(--bg-hover);
}

.editor-icon {
    font-size: 20px;
}

.editor-icon-img {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.editor-icon-img.pycharm-icon {
    filter: invert(1);
}

.editor-name {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.editor-percent {
    font-size: 13px;
    color: var(--accent-secondary);
    font-family: var(--font-mono);
    font-weight: 600;
}

.heatmap-grid {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.heatmap-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.day-label {
    font-size: 11px;
    color: var(--text-muted);
    width: 40px;
    text-align: right;
}

.heatmap-cell {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.heatmap-cell[data-level="0"] { background: var(--bg-tertiary); }
.heatmap-cell[data-level="1"] { background: rgba(99, 102, 241, 0.2); }
.heatmap-cell[data-level="2"] { background: rgba(99, 102, 241, 0.4); }
.heatmap-cell[data-level="3"] { background: rgba(99, 102, 241, 0.6); }
.heatmap-cell[data-level="4"] { background: rgba(99, 102, 241, 0.8); }

.heatmap-cell:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px var(--accent-glow);
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: var(--text-muted);
}

.legend-cell {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

.legend-cell[data-level="0"] { background: var(--bg-tertiary); }
.legend-cell[data-level="1"] { background: rgba(99, 102, 241, 0.2); }
.legend-cell[data-level="2"] { background: rgba(99, 102, 241, 0.4); }
.legend-cell[data-level="3"] { background: rgba(99, 102, 241, 0.6); }
.legend-cell[data-level="4"] { background: rgba(99, 102, 241, 0.8); }

.quick-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.quick-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.quick-stat-item:hover {
    background: var(--bg-hover);
    transform: translateY(-2px);
}

.quick-stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-secondary);
    font-family: var(--font-mono);
}

.quick-stat-label {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    margin-top: 4px;
}

/* ===== CSS Variables ===== */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-card: #1a1a1d;
    --bg-hover: #232326;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.15);
    
    --border-color: #27272a;
    --border-light: #3f3f46;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-text: linear-gradient(135deg, #6366f1 0%, #a78bfa 50%, #6366f1 100%);
    --gradient-glow: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --section-padding: 120px;
    --container-width: 1200px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    padding: 12px 0;
    border-bottom-color: var(--border-color);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.logo-sub {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

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

.nav-link {
    position: relative;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

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

.nav-link:hover::after {
    width: 50%;
}

.nav-link.active {
    color: var(--accent-secondary);
}

.nav-link.active::after {
    width: 70%;
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
}

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
    background: var(--accent-primary);
    color: white;
}

.btn-small:hover {
    background: var(--accent-secondary);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.grid-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: var(--gradient-glow);
    opacity: 0.6;
    filter: blur(80px);
    animation: pulse-glow 8s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.6; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 900px;
    animation: fade-up 1s ease-out;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.pulse {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(42px, 8vw, 69px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.title-line {
    display: block;
}

.title-line.highlight {
    background: var(--gradient-text);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 5s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    max-width: 100%;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    font-feature-settings: 'tnum';
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.scroll-indicator {
    position: fixed;
    bottom: 40px;
    right: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    animation: fade-up 1s ease-out 0.5s backwards;
    z-index: 50;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 2px;
    animation: scroll-wheel 2s ease-in-out infinite;
}

@keyframes scroll-wheel {
    0%, 100% { opacity: 1; transform: translateY(0); }
    50% { opacity: 0.3; transform: translateY(6px); }
}

.scroll-indicator span {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Section Styles ===== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: 48px;
}

/* ===== About Section ===== */
.about {
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature {
    display: flex;
    gap: 16px;
}

.feature-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-md);
    color: var(--accent-secondary);
}

.feature-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.feature-content p {
    font-size: 14px;
    color: var(--text-muted);
}

/* Code Block */
.code-block {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.filename {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.code-content {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content .keyword { color: #c678dd; }
.code-content .string { color: #98c379; }
.code-content .function { color: #61afef; }
.code-content .class-name { color: #e5c07b; }
.code-content .number { color: #d19a66; }

/* ===== Projects Section ===== */
.projects-filter {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-light);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-image {
    aspect-ratio: 16/10;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.project-content {
    padding: 24px;
}

.project-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.tag {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 50px;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

.project-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.project-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.author {
    font-size: 13px;
    color: var(--text-muted);
}

.project-link {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent-secondary);
}

.project-link:hover {
    color: var(--accent-primary);
}

/* ===== Research Section ===== */
.research {
    background: var(--bg-secondary);
}

.research-list {
    max-width: 800px;
    margin: 0 auto;
}

.research-item {
    display: flex;
    gap: 32px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.research-item:hover {
    background: rgba(99, 102, 241, 0.02);
    margin: 0 -24px;
    padding-left: 24px;
    padding-right: 24px;
    border-radius: var(--radius-md);
}

.research-item:last-child {
    border-bottom: none;
}

.research-year {
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-secondary);
    font-feature-settings: 'tnum';
}

.research-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.research-authors {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.research-venue {
    font-size: 14px;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 12px;
}

.research-links {
    display: flex;
    gap: 16px;
}

.research-link {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent-secondary);
    padding: 4px 12px;
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.research-link:hover {
    background: var(--accent-primary);
    color: white;
}

/* ===== Talks Section ===== */
.talks-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.talk-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.talk-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-light);
}

.talk-video {
    position: relative;
    aspect-ratio: 16/9;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.video-placeholder {
    color: var(--text-muted);
    padding: 20px;
    background: var(--bg-hover);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.talk-card:hover .video-placeholder {
    color: var(--accent-secondary);
    background: var(--accent-glow);
}

.talk-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    padding: 4px 8px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-family: var(--font-mono);
}

.talk-content {
    padding: 20px;
}

.talk-date {
    font-size: 12px;
    color: var(--text-muted);
}

.talk-title {
    font-size: 16px;
    font-weight: 600;
    margin: 8px 0;
    line-height: 1.4;
}

.talk-speaker {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== Blog Section ===== */
.blog {
    background: var(--bg-secondary);
}

.blog-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

.blog-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-light);
}

.blog-card.featured {
    grid-row: span 2;
}

.blog-image {
    aspect-ratio: 16/9;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.blog-content {
    padding: 24px;
}

.blog-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.blog-category {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-date {
    font-size: 12px;
    color: var(--text-muted);
}

.blog-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.blog-card:not(.featured) .blog-title {
    font-size: 16px;
}

.blog-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.blog-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.author-name {
    font-size: 14px;
    font-weight: 500;
}

/* ===== Events Section ===== */
.events-timeline {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.event-card {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.event-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 30px var(--accent-glow);
}

.event-date {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.event-date .day {
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
}

.event-date .month {
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.event-type {
    display: inline-block;
    padding: 4px 10px;
    background: var(--accent-glow);
    border-radius: 50px;
    font-size: 11px;
    font-weight: 500;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.event-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.event-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.event-details {
    display: flex;
    gap: 24px;
    margin-bottom: 16px;
}

.event-details span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
    padding: 80px 0 32px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    max-width: 300px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column a,
.footer-column li {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

.made-with .heart {
    color: #ef4444;
    animation: heartbeat 1s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-visual {
        order: -1;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .talks-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        width: 100%;
        padding: 16px;
        text-align: center;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .talks-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-card.featured {
        grid-row: auto;
    }
    
    .research-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .event-card {
        flex-direction: column;
        text-align: center;
    }
    
    .event-date {
        width: 100%;
        flex-direction: row;
        gap: 8px;
        height: auto;
        padding: 16px;
    }
    
    .event-details {
        flex-direction: column;
        gap: 8px;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        letter-spacing: -1px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .projects-filter {
        gap: 4px;
    }
    
    .filter-btn {
        padding: 8px 14px;
        font-size: 13px;
    }
}