/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Colors - Light Theme (default) */
    --bg-primary: #faf9f7;
    --bg-secondary: #f0eeeb;
    --text-primary: #1a1a1a;
    --text-secondary: #5a5a5a;
    --text-muted: #8a8a8a;
    --accent: #e85d04;
    --accent-soft: #fff0e6;
    --accent-secondary: #06d6a0;
    --border: rgba(0, 0, 0, 0.08);
    --card-bg: #ffffff;
    --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
    --glow-color: rgba(232, 93, 4, 0.15);
    --code-bg: #1e1e1e;
    --code-text: #d4d4d4;
    
    /* Visualizer colors */
    --bar-color: #e85d04;
    --bar-comparing: #ffd60a;
    --bar-sorted: #06d6a0;
    --node-color: #e85d04;
    --node-active: #ffd60a;
    --path-start: #06d6a0;
    --path-end: #e85d04;
    --path-wall: #1a1a1a;
    --path-visited: rgba(232, 93, 4, 0.3);
    --path-found: #06d6a0;
    
    /* Typography */
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --section-padding: clamp(80px, 15vh, 140px);
    --container-width: min(1200px, 90vw);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #606060;
    --accent: #ff7b29;
    --accent-soft: #1f1510;
    --accent-secondary: #00e5a0;
    --border: rgba(255, 255, 255, 0.08);
    --card-bg: #1a1a1a;
    --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
    --glow-color: rgba(255, 123, 41, 0.2);
    --code-bg: #0d0d0d;
    --path-wall: #f5f5f5;
}

/* ============================================
   Skip Link (Accessibility)
   ============================================ */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 8px 8px;
    z-index: 9999;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-decoration: none;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
    width: 100%;
    min-height: 100vh;
}

::selection {
    background: var(--accent);
    color: white;
}

/* ============================================
   Cursor Glow Effect
   ============================================ */
.cursor-glow {
    position: fixed;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 0;
    opacity: 0;
    transition: opacity 0.3s ease;
}

@media (hover: hover) {
    body:hover .cursor-glow {
        opacity: 1;
    }
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5vw;
    background: transparent;
    z-index: 100;
    transition: background var(--transition-normal), backdrop-filter var(--transition-normal);
    max-width: 100%;
}

@media (min-width: 1400px) {
    .nav {
        padding-left: calc((100% - var(--container-width)) / 2);
        padding-right: calc((100% - var(--container-width)) / 2);
    }
}

.nav.scrolled {
    background: rgba(250, 249, 247, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .nav.scrolled {
    background: rgba(10, 10, 10, 0.85);
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.logo-bracket {
    color: var(--accent);
}

.nav-logo:hover {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-normal);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.theme-toggle {
    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: transform var(--transition-fast), background var(--transition-normal);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
}

.theme-toggle .sun,
.theme-toggle .moon {
    position: absolute;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle .moon {
    opacity: 0;
    transform: rotate(-90deg);
}

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

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 120px 5vw 80px;
    position: relative;
    max-width: 100%;
}

@media (min-width: 1400px) {
    .hero {
        padding-left: calc((100% - var(--container-width)) / 2);
        padding-right: calc((100% - var(--container-width)) / 2);
    }
}

.hero-content {
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

.terminal-line {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    border: 1px solid var(--border);
}

.terminal-prompt {
    color: var(--accent);
}

.terminal-command {
    color: var(--text-secondary);
}

.terminal-command.typing::after {
    content: '|';
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-name {
    font-family: var(--font-serif);
    font-size: clamp(3.5rem, 12vw, 8rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.name-part {
    display: block;
}

.name-part.accent {
    font-style: italic;
    color: var(--accent);
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tagline-static {
    color: var(--text-muted);
}

.tagline-rotate {
    position: relative;
    height: 1.5em;
    overflow: hidden;
    color: var(--accent);
}

.tagline-rotate span {
    display: block;
    animation: rotateWords 10s infinite;
}

@keyframes rotateWords {
    0%, 16% { transform: translateY(0); }
    20%, 36% { transform: translateY(-100%); }
    40%, 56% { transform: translateY(-200%); }
    60%, 76% { transform: translateY(-300%); }
    80%, 96% { transform: translateY(-400%); }
    100% { transform: translateY(0); }
}

.cursor-blink {
    animation: blink 1s infinite;
    color: var(--accent);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 1.8rem;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

.btn-icon {
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(3px);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

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

.btn-large {
    padding: 1.2rem 2.5rem;
    font-size: 1rem;
    background: var(--accent);
    color: white;
    border-radius: 10px;
}

.btn-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(232, 93, 4, 0.3);
}


/* ============================================
   Sections Common
   ============================================ */
section {
    padding: var(--section-padding) 5vw;
    max-width: 100%;
}

@media (min-width: 1400px) {
    section {
        padding-left: calc((100% - var(--container-width)) / 2);
        padding-right: calc((100% - var(--container-width)) / 2);
    }
}

.section-header {
    margin-bottom: 3rem;
    display: flex;
    align-items: baseline;
    gap: 1rem;
    flex-wrap: wrap;
}

.section-number {
    font-family: var(--font-mono);
    color: var(--accent);
    font-size: 0.9rem;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
}

.section-decorator {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.about-text {
    max-width: 100%;
    overflow: hidden;
}

.about-text .lead {
    font-size: 1.3rem;
    color: var(--text-primary);
    line-height: 1.7;
}

.highlight {
    color: var(--accent);
    font-weight: 500;
}

.code-comment {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.9em;
    font-style: italic;
}

.philosophy-card {
    margin-top: 2.5rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--card-shadow);
    max-width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.philosophy-card h3 {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-icon {
    font-size: 1.2rem;
}

.philosophy-list {
    list-style: none;
}

.philosophy-list li {
    padding: 0.6rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.philosophy-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-family: var(--font-mono);
}

.philosophy-list li strong {
    color: var(--text-primary);
}

/* Code Window */
.about-visual {
    position: sticky;
    top: 120px;
}

.code-window {
    background: var(--code-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-normal);
    max-width: 100%;
}

.code-window:hover {
    transform: translateY(-5px) rotate(1deg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.code-dot.red { background: #ff5f56; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #27c93f; }

.code-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
}

.code-content {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--code-text);
    overflow-x: auto;
    max-width: 100%;
}

.code-content code {
    display: block;
    white-space: pre;
}

.code-keyword { color: #c586c0; }
.code-type { color: #4ec9b0; }
.code-string { color: #ce9178; }
.code-prop { color: #9cdcfe; }
.code-comment { color: #6a9955; font-style: italic; }

/* ============================================
   Skills Section - Tree View
   ============================================ */
.skills-trees {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
    gap: 1.5rem;
    max-width: 100%;
}

.skill-tree {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all var(--transition-normal);
    max-width: 100%;
    overflow: hidden;
}

.skill-tree:hover {
    border-color: rgba(232, 93, 4, 0.3);
    box-shadow: 0 10px 30px rgba(232, 93, 4, 0.08);
}

.skill-tree.featured {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--accent-soft), var(--card-bg));
}

.skill-tree.legacy {
    opacity: 0.7;
    border-style: dashed;
}

.skill-tree.legacy:hover {
    opacity: 1;
}

.skill-tree.exploring-section {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--bg-secondary), var(--card-bg));
}

.tree-title {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tree-icon {
    font-size: 1.2rem;
}

.tree-comment {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-style: italic;
}

.category-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 0.2rem 0.5rem;
    background: var(--accent);
    color: white;
    border-radius: 20px;
    margin-left: auto;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.category-badge.old {
    background: var(--text-muted);
}

.category-badge.exploring {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

/* Tree Structure */
.tree-container {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    max-width: 100%;
    overflow-x: auto;
}

.tree-branch {
    margin-bottom: 0.5rem;
}

.tree-branch.standalone {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
}

.tree-branch.standalone:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.tree-node {
    color: var(--text-primary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.tree-node.root {
    font-weight: 600;
    color: var(--accent);
}

.tree-node:hover {
    background: var(--accent-soft);
}

.tree-line {
    color: var(--text-muted);
    user-select: none;
}

.tree-children {
    margin-left: 0.5rem;
    margin-top: 0.25rem;
}

.tree-children.nested {
    margin-left: 0;
}

.tree-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.tree-badge.daily {
    background: rgba(6, 214, 160, 0.15);
    color: var(--accent-secondary);
    border-color: rgba(6, 214, 160, 0.3);
}

.tree-badge.exploring {
    background: rgba(99, 102, 241, 0.15);
    color: #818cf8;
    border-color: rgba(99, 102, 241, 0.3);
}

.tree-badge.fav {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: rgba(232, 93, 4, 0.3);
}

.tree-badge.old {
    background: rgba(138, 138, 138, 0.15);
    color: var(--text-muted);
    border-color: var(--border);
}

/* Currently Exploring Grid */
.exploring-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
    gap: 1rem;
}

.exploring-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    transition: all var(--transition-normal);
}

.exploring-item:hover {
    border-color: rgba(99, 102, 241, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.1);
}

.exploring-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.exploring-name {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.exploring-why {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Mobile Fallback Tags (hidden on desktop) */
.skill-tags-mobile {
    display: none;
}

/* Legacy skill tags (keep for compatibility) */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 6px;
    border: 1px solid var(--border);
    transition: all var(--transition-fast);
    cursor: default;
}

.skill-tag:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

/* Mobile: Show tags instead of trees */
@media (max-width: 600px) {
    .skills-trees {
        grid-template-columns: 1fr;
    }
    
    .tree-container {
        display: none;
    }
    
    .skill-tags-mobile {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-top: 1rem;
    }
    
    .skill-tags-mobile .skill-tag {
        font-size: 0.75rem;
        padding: 0.3rem 0.6rem;
    }
    
    .skill-tree.exploring-section {
        grid-column: 1;
    }
    
    .exploring-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .exploring-item {
        padding: 0.75rem;
    }
}

@media (max-width: 400px) {
    .exploring-grid {
        grid-template-columns: 1fr;
    }
    
    .exploring-icon {
        font-size: 1.25rem;
    }
    
    .exploring-name {
        font-size: 0.85rem;
    }
}

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

.playground-intro {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.playground-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
    gap: 1.5rem;
}

.playground-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.playground-card:hover {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(232, 93, 4, 0.1);
}

.card-header {
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
}

.card-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.25rem 0.6rem;
    background: var(--accent-secondary);
    color: white;
    border-radius: 20px;
    text-transform: uppercase;
}

.algorithm-selector {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-secondary);
    padding: 0.25rem;
    border-radius: 6px;
}

.algo-btn {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.algo-btn:hover {
    color: var(--text-primary);
}

.algo-btn.active {
    background: var(--card-bg);
    color: var(--accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.visualizer {
    height: 200px;
    padding: 1rem;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    background: var(--bg-secondary);
}

#nn-visualizer {
    align-items: center;
    padding: 0;
    overflow: hidden;
}

#nn-canvas {
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Bars for sorting */
.bars-container {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    height: 100%;
    width: 100%;
}

.bar {
    flex: 1;
    background: var(--bar-color);
    border-radius: 2px 2px 0 0;
    transition: height 0.05s ease, background 0.2s ease;
    min-width: 4px;
}

.bar.comparing {
    background: var(--bar-comparing);
}

.bar.sorted {
    background: var(--bar-sorted);
}

/* Grid for pathfinding */
.grid-container {
    display: grid;
    gap: 1px;
    width: 100%;
    height: 100%;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.grid-cell {
    background: var(--card-bg);
    transition: background 0.1s ease;
    cursor: pointer;
}

.grid-cell:hover {
    background: var(--bg-secondary);
}

.grid-cell.wall {
    background: var(--path-wall);
}

.grid-cell.start {
    background: var(--path-start);
}

.grid-cell.end {
    background: var(--path-end);
}

.grid-cell.visited {
    background: var(--path-visited);
    animation: visitPulse 0.3s ease;
}

.grid-cell.path {
    background: var(--path-found);
    animation: pathPulse 0.2s ease;
}

@keyframes visitPulse {
    0% { transform: scale(0.3); }
    100% { transform: scale(1); }
}

@keyframes pathPulse {
    0% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.card-footer {
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.play-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.play-btn:hover {
    background: var(--text-primary);
    transform: translateY(-1px);
}

.play-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.play-icon {
    font-size: 0.7rem;
}

.reset-btn {
    padding: 0.6rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reset-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.complexity, .nn-info, .path-info {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

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

.projects-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 100%;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    max-width: 100%;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent), var(--accent-secondary));
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition-normal);
}

.project-card:hover {
    transform: translateX(5px);
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(232, 93, 4, 0.1);
}

.project-card:hover::before {
    transform: scaleY(1);
}

.project-card.featured {
    border-color: rgba(232, 93, 4, 0.3);
}

.project-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: 12px;
}

.project-content {
    flex: 1;
}

.project-content h3 {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.project-tagline {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tags span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border-radius: 20px;
    border: 1px solid var(--border);
}

@media (max-width: 600px) {
    .project-card {
        flex-direction: column;
        text-align: center;
    }
    
    .project-icon {
        margin: 0 auto;
    }
    
    .project-tags {
        justify-content: center;
    }
}

/* Project Categories */
.project-category {
    margin-bottom: 3rem;
}

.project-category:last-child {
    margin-bottom: 0;
}

.category-label {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-label .category-icon {
    font-size: 1.2rem;
}

.category-label .category-note {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: 0.5rem;
}

/* Project Header with Badges */
.project-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
    flex-wrap: wrap;
}

.project-header h3 {
    margin-bottom: 0;
}

.project-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-badge.appstore {
    background: linear-gradient(135deg, #007AFF, #5856D6);
    color: white;
}

.project-badge.github {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.project-badge.live {
    background: linear-gradient(135deg, var(--accent-secondary), #00b894);
    color: white;
}

.project-badge.coming-soon {
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid var(--accent);
}

/* Clickable Project Cards */
.project-card.has-link {
    cursor: pointer;
}

.project-link-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.project-card.has-link:hover {
    transform: translateX(8px);
    box-shadow: 0 15px 50px rgba(232, 93, 4, 0.15);
}

.project-card.has-link::after {
    content: '→';
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 1.25rem;
    color: var(--accent);
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--transition-normal);
}

.project-card.has-link:hover::after {
    opacity: 1;
    transform: translateX(0);
}

/* Tools Grid - More Compact */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: 1rem;
}

.project-card.compact {
    padding: 1.5rem;
    flex-direction: column;
    gap: 0;
}

.project-card.compact .project-header {
    margin-bottom: 0.75rem;
}

.project-card.compact .project-header h3 {
    font-size: 1.1rem;
}

.project-card.compact .tool-icon {
    font-size: 1.25rem;
}

.project-card.compact .project-description {
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.project-card.compact .project-tags span {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
}

.project-card.compact::after {
    top: 1rem;
    right: 1rem;
    font-size: 1rem;
}

/* Projects Grid for Featured Items */
.project-category:first-child .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
    gap: 1.5rem;
}

.project-category:first-child .project-card {
    flex-direction: column;
}

.project-category:first-child .project-icon {
    margin: 0;
}

/* Professional Work Grid */
.project-category:nth-child(2) .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: 1.25rem;
}

.project-category:nth-child(2) .project-card {
    flex-direction: column;
    padding: 1.75rem;
}

.project-category:nth-child(2) .project-icon {
    margin: 0;
    width: 50px;
    height: 50px;
    font-size: 2rem;
}

@media (max-width: 768px) {
    .project-category:first-child .projects-grid,
    .project-category:nth-child(2) .projects-grid,
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .category-label {
        flex-wrap: wrap;
    }
    
    .category-label .category-note {
        width: 100%;
        margin-left: 1.7rem;
        margin-top: 0.25rem;
    }
}

@media (max-width: 600px) {
    .project-category:first-child .project-card,
    .project-category:nth-child(2) .project-card {
        text-align: center;
    }
    
    .project-category:first-child .project-icon,
    .project-category:nth-child(2) .project-icon {
        margin: 0 auto;
    }
    
    .project-header {
        justify-content: center;
    }
    
    .project-card.compact {
        text-align: left;
    }
    
    .project-card.compact .project-header {
        justify-content: flex-start;
    }
}

/* ============================================
   Experience Section
   ============================================ */
.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 1.5rem;
}

.exp-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.exp-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.exp-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}

.exp-card:hover::before {
    transform: scaleX(1);
}

.exp-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.exp-card h3 {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.exp-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.exp-card.featured {
    border-color: rgba(232, 93, 4, 0.4);
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--accent-soft) 100%);
}

.exp-card.featured::before {
    transform: scaleX(1);
}

.exp-card.featured .exp-icon {
    background: var(--accent);
    color: white;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.5rem;
}

.exp-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    border: 1px solid rgba(232, 93, 4, 0.3);
}

/* ============================================
   Tech Explained Section
   ============================================ */
.explained {
    background: var(--bg-secondary);
}

.explained-intro {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    max-width: 650px;
    line-height: 1.7;
}

.explainer-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.explainer-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.explainer-card:hover {
    border-color: rgba(232, 93, 4, 0.3);
}

.explainer-card.expanded {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(232, 93, 4, 0.1);
}

.explainer-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem 2rem;
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition-fast);
}

.explainer-header:hover {
    background: var(--bg-secondary);
}

.explainer-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: 14px;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.explainer-card.expanded .explainer-icon {
    transform: scale(1.05);
    background: var(--accent);
}

.explainer-title {
    flex: 1;
}

.explainer-title h3 {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.explainer-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.explainer-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 10px;
    color: var(--text-muted);
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.toggle-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
}

.explainer-card.expanded .toggle-icon {
    transform: rotate(180deg);
}

.explainer-card.expanded .explainer-toggle {
    background: var(--accent);
    color: white;
}

.explainer-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.explainer-card.expanded .explainer-content {
    max-height: 2000px;
}

.explainer-body {
    padding: 0 2rem 2rem;
    border-top: 1px solid var(--border);
    padding-top: 2rem;
}

/* Concept Intro */
.concept-intro {
    margin-bottom: 2rem;
}

.concept-intro p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.concept-intro p:last-child {
    margin-bottom: 0;
}

/* Neural Network Simple Visual */
.concept-diagram {
    margin-bottom: 2rem;
}

.nn-simple-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow-x: auto;
}

.nn-layer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.layer-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nn-nodes {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nn-node {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 8px rgba(232, 93, 4, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nn-node.input {
    background: var(--accent-secondary);
    box-shadow: 0 2px 8px rgba(6, 214, 160, 0.3);
}

.nn-node.hidden {
    background: var(--accent);
}

.nn-node.output {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
}

.nn-connections {
    width: 60px;
    height: 120px;
    position: relative;
    background: 
        linear-gradient(135deg, transparent 48%, var(--border) 48%, var(--border) 52%, transparent 52%),
        linear-gradient(45deg, transparent 48%, var(--border) 48%, var(--border) 52%, transparent 52%),
        linear-gradient(90deg, transparent 48%, var(--border) 48%, var(--border) 52%, transparent 52%);
    background-size: 100% 33.33%;
    background-position: 0 0, 0 33.33%, 0 66.66%;
    opacity: 0.5;
}

/* Comparison Block */
.concept-comparison {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.comparison-item {
    flex: 1;
    min-width: 200px;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.comparison-item.old {
    border-color: var(--text-muted);
    opacity: 0.7;
}

.comparison-item.new {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.comparison-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.comparison-item code {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    word-break: break-all;
}

.comparison-result {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.comparison-arrow {
    font-size: 1.5rem;
    color: var(--accent);
    font-weight: bold;
}

/* Detail Blocks */
.concept-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.detail-block {
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: border-color var(--transition-fast);
}

.detail-block:hover {
    border-color: rgba(232, 93, 4, 0.3);
}

.detail-block.highlight-block {
    background: var(--accent-soft);
    border-color: rgba(232, 93, 4, 0.3);
    grid-column: 1 / -1;
}

.detail-block h4 {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.detail-icon {
    font-size: 1rem;
}

.detail-block p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Code Example in Explainer */
.code-example {
    margin-bottom: 2rem;
}

.code-example .code-window {
    max-width: 500px;
}

.code-example .code-window.small {
    font-size: 0.8rem;
}

.code-example .code-content {
    padding: 1.25rem;
    line-height: 1.7;
}

.code-func {
    color: #dcdcaa;
}

.code-number {
    color: #b5cea8;
}

/* TL;DR Block */
.concept-tldr {
    display: flex;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-soft), transparent);
    border-radius: 12px;
    border-left: 4px solid var(--accent);
    align-items: flex-start;
}

.tldr-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.3rem 0.6rem;
    background: var(--accent);
    color: white;
    border-radius: 4px;
    flex-shrink: 0;
}

.concept-tldr p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* Responsive adjustments for Explainer */
@media (max-width: 768px) {
    .explainer-header {
        padding: 1.25rem 1.5rem;
        gap: 1rem;
    }
    
    .explainer-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
    
    .explainer-title h3 {
        font-size: 1rem;
    }
    
    .explainer-body {
        padding: 0 1.5rem 1.5rem;
        padding-top: 1.5rem;
    }
    
    .concept-comparison {
        flex-direction: column;
    }
    
    .comparison-arrow {
        transform: rotate(90deg);
    }
    
    .comparison-item {
        width: 100%;
    }
    
    .nn-simple-visual {
        padding: 1.5rem 1rem;
        gap: 0.25rem;
    }
    
    .nn-connections {
        width: 40px;
    }
    
    .concept-tldr {
        flex-direction: column;
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .explainer-toggle {
        display: none;
    }
    
    .concept-details {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-terminal {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: 0.75rem 1.5rem;
    background: var(--code-bg);
    color: var(--code-text);
    border-radius: 8px;
    margin-bottom: 2rem;
}

.contact-terminal .terminal-prompt {
    color: var(--accent);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2.5rem;
}

.social-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    transition: all var(--transition-normal);
}

.social-link svg {
    width: 22px;
    height: 22px;
}

.social-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-3px) rotate(-5deg);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 3rem calc((100vw - var(--container-width)) / 2);
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.footer-note .code-comment {
    font-size: 0.8rem;
}

.heart {
    display: inline-block;
    animation: heartbeat 1.5s ease-in-out infinite;
}

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

.copyright {
    font-size: 0.8rem !important;
    font-family: var(--font-mono);
    margin-top: 0.5rem !important;
}

/* ============================================
   Toast Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 1rem 2rem;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Intersection Observer animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animations for grids */
.skill-category:nth-child(1) { transition-delay: 0.05s; }
.skill-category:nth-child(2) { transition-delay: 0.1s; }
.skill-category:nth-child(3) { transition-delay: 0.15s; }
.skill-category:nth-child(4) { transition-delay: 0.2s; }
.skill-category:nth-child(5) { transition-delay: 0.25s; }
.skill-category:nth-child(6) { transition-delay: 0.3s; }
.skill-category:nth-child(7) { transition-delay: 0.35s; }

.exp-card:nth-child(1) { transition-delay: 0.05s; }
.exp-card:nth-child(2) { transition-delay: 0.1s; }
.exp-card:nth-child(3) { transition-delay: 0.15s; }
.exp-card:nth-child(4) { transition-delay: 0.2s; }
.exp-card:nth-child(5) { transition-delay: 0.25s; }
.exp-card:nth-child(6) { transition-delay: 0.3s; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 900px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-visual {
        position: relative;
        top: 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        padding-top: 100px;
        padding-bottom: 60px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .hero-tagline {
        flex-direction: column;
    }
    
    .section-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .playground-grid {
        grid-template-columns: 1fr;
    }
    
    .card-footer {
        justify-content: center;
    }
    
    .complexity, .nn-info, .path-info {
        margin-left: 0;
        width: 100%;
        text-align: center;
        margin-top: 0.5rem;
    }
}

@media (max-width: 480px) {
    section {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .nav {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .hero {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .code-window {
        font-size: 0.7rem;
    }
    
    .code-content {
        padding: 1rem;
    }
    
    .visualizer {
        height: 160px;
    }
    
    .philosophy-card {
        padding: 1.25rem;
    }
    
    .skill-tree {
        padding: 1rem;
    }
    
    .project-card {
        padding: 1.25rem;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}