:root {
            --cube-white: #f5f5f5;
            --cube-yellow: #ffd500;
            --cube-red: #ff4444;
            --cube-orange: #ff8800;
            --cube-blue: #0066cc;
            --cube-green: #00aa44;
            --dark-bg: #0a0a0f;
            --card-bg: #12121a;
            --text-primary: #e8e8ec;
            --text-secondary: #888899;
            --accent: #00d4ff;
            --gradient-1: #ff006e;
            --gradient-2: #8338ec;
            --gradient-3: #3a86ff;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', sans-serif;
            background: var(--dark-bg);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        h1, h2, h3, h4 {
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 600;
        }

        /* Animated Background */
        .bg-animation {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            opacity: 0.4;
        }

        .cube-particle {
            position: absolute;
            width: 30px;
            height: 30px;
            background: linear-gradient(45deg, var(--cube-red), var(--cube-blue));
            animation: float 20s infinite linear;
            opacity: 0.1;
        }

        @keyframes float {
            0% { transform: translateY(100vh) rotate(0deg); }
            100% { transform: translateY(-100px) rotate(720deg); }
        }

        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 1.5rem 3rem;
            background: rgba(10, 10, 15, 0.9);
            backdrop-filter: blur(20px);
            z-index: 1000;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }

        .nav-content {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--cube-white), var(--cube-yellow));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .cube-icon {
            width: 30px;
            height: 30px;
            background: linear-gradient(135deg, var(--cube-red), var(--cube-blue), var(--cube-yellow));
            border-radius: 4px;
            animation: rotate 4s infinite linear;
        }

        @keyframes rotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

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

        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 8rem 3rem 4rem;
            position: relative;
        }

        .hero-content {
            max-width: 1000px;
            text-align: center;
        }

        .hero h1 {
            font-size: clamp(3rem, 8vw, 6rem);
            line-height: 1;
            margin-bottom: 1.5rem;
            background: linear-gradient(135deg, var(--cube-white) 0%, var(--accent) 50%, var(--cube-yellow) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradient-shift 8s ease infinite;
        }

        @keyframes gradient-shift {
            0%, 100% { filter: hue-rotate(0deg); }
            50% { filter: hue-rotate(30deg); }
        }

        .hero-subtitle {
            font-size: 1.5rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            font-weight: 300;
        }

        .hero-intro {
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto 3rem;
            color: var(--text-primary);
            opacity: 0.9;
        }

        .cta-button {
            display: inline-block;
            padding: 1rem 2.5rem;
            background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 10px 30px rgba(255, 0, 110, 0.3);
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 20px 40px rgba(255, 0, 110, 0.4);
        }

        /* Section Styling */
        section {
            padding: 6rem 3rem;
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-header h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--text-primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .section-number {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--gradient-2), var(--gradient-3));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 1rem;
            font-family: 'Space Grotesk', sans-serif;
        }

        /* Phase Cards */
        .phase-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .phase-card {
            background: var(--card-bg);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 20px;
            padding: 2.5rem;
            position: relative;
            overflow: hidden;
            transition: transform 0.3s, border-color 0.3s;
        }

        .phase-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
        }

        .phase-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
        }

        .phase-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--accent);
        }

        .phase-time {
            display: inline-block;
            background: rgba(0, 212, 255, 0.1);
            color: var(--accent);
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 1rem;
            font-family: 'Space Grotesk', sans-serif;
        }

        .phase-card p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }

        .lesson {
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 10px;
            border-left: 3px solid var(--cube-yellow);
            margin-top: 1rem;
            font-style: italic;
        }

        /* Decision Tree Styles */
        .decision-tree {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 3rem;
            margin: 3rem 0;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .tree-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }

        .tree-node {
            background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(131,56,236,0.1));
            border: 2px solid var(--accent);
            border-radius: 15px;
            padding: 1.5rem 2rem;
            text-align: center;
            max-width: 300px;
            position: relative;
            cursor: pointer;
            transition: all 0.3s;
        }

        .tree-node:hover {
            background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(131,56,236,0.2));
            transform: scale(1.05);
        }

        .tree-node h4 {
            color: var(--accent);
            margin-bottom: 0.5rem;
        }

        .tree-connector {
            width: 2px;
            height: 40px;
            background: linear-gradient(to bottom, var(--accent), var(--gradient-2));
        }

        .tree-branches {
            display: flex;
            gap: 3rem;
            position: relative;
        }

        .tree-branches::before {
            content: '';
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--gradient-2);
        }

        .branch {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
        }

        .branch-node {
            background: rgba(255,255,255,0.05);
            border: 1px solid var(--text-secondary);
            border-radius: 10px;
            padding: 1rem 1.5rem;
            font-size: 0.9rem;
            transition: all 0.3s;
        }

        .branch-node:hover {
            border-color: var(--cube-yellow);
            background: rgba(255,213,0,0.1);
        }

        .branch-yes {
            border-color: var(--cube-green);
            color: var(--cube-green);
        }

        .branch-no {
            border-color: var(--cube-red);
            color: var(--cube-red);
        }

        /* Timeline Diagram */
        .timeline-container {
            position: relative;
            padding: 3rem 0;
        }

        .timeline-line {
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--gradient-1), var(--gradient-2), var(--gradient-3));
            transform: translateX(-50%);
        }

        .timeline-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 4rem;
            position: relative;
        }

        .timeline-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .timeline-content {
            width: 45%;
            background: var(--card-bg);
            padding: 2rem;
            border-radius: 15px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .timeline-dot {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 20px;
            background: var(--accent);
            border-radius: 50%;
            border: 4px solid var(--dark-bg);
            box-shadow: 0 0 20px var(--accent);
        }

        .timeline-date {
            font-family: 'Space Grotesk', sans-serif;
            color: var(--accent);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }

        /* Records Section */
        .records-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 3rem;
        }

        .record-card {
            background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 15px;
            padding: 2rem;
            text-align: center;
            transition: transform 0.3s;
        }

        .record-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
        }

        .record-time {
            font-size: 3rem;
            font-weight: 700;
            font-family: 'Space Grotesk', sans-serif;
            background: linear-gradient(135deg, var(--accent), var(--cube-yellow));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin: 1rem 0;
        }

        .record-label {
            color: var(--text-secondary);
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .record-holder {
            color: var(--text-primary);
            margin-top: 0.5rem;
            font-weight: 500;
        }

        /* Hardware Discovery Diagram */
        .hardware-flow {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            margin: 3rem 0;
            padding: 2rem;
            background: var(--card-bg);
            border-radius: 20px;
        }

        .hardware-stage {
            text-align: center;
            padding: 1.5rem;
            background: rgba(255,255,255,0.05);
            border-radius: 15px;
            border: 2px solid transparent;
            transition: all 0.3s;
            min-width: 150px;
        }

        .hardware-stage:hover {
            border-color: var(--accent);
            transform: scale(1.05);
        }

        .hardware-stage.cheap {
            border-color: var(--cube-red);
        }

        .hardware-stage.competition {
            border-color: var(--cube-green);
        }

        .hardware-icon {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
        }

        .arrow {
            font-size: 2rem;
            color: var(--accent);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        /* Application Section */
        .application-box {
            background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(131,56,236,0.1));
            border: 2px solid var(--accent);
            border-radius: 20px;
            padding: 3rem;
            margin-top: 3rem;
        }

        .calculation-box {
            background: rgba(0,0,0,0.3);
            border-radius: 15px;
            padding: 2rem;
            margin: 2rem 0;
            font-family: 'Space Grotesk', monospace;
            text-align: center;
        }

        .calculation-line {
            font-size: 1.2rem;
            margin: 0.5rem 0;
            color: var(--text-secondary);
        }

        .calculation-result {
            font-size: 2rem;
            color: var(--cube-yellow);
            font-weight: 700;
            margin-top: 1rem;
        }

        /* Utility Classes */
        .section-subtitle {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        .phase-card-highlight {
            border-color: var(--cube-orange);
        }

        .hardware-title {
            text-align: center;
            margin: 4rem 0 2rem;
            color: var(--text-primary);
        }

        .record-date {
            color: var(--text-secondary);
            font-size: 0.8rem;
            margin-top: 0.5rem;
        }

        .application-title {
            color: var(--accent);
            margin-bottom: 1.5rem;
        }

        .application-followup {
            margin-top: 1.5rem;
        }

        .application-pattern {
            margin-top: 2rem;
        }

        .god-number-title {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--text-primary);
        }

        .tree-node-yellow {
            border-color: var(--cube-yellow);
        }

        .tree-node-green {
            border-color: var(--cube-green);
        }

        .tree-node-blue {
            border-color: var(--cube-blue);
        }

        .tree-connector-short {
            height: 20px;
        }

        .footer-attribution {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        /* Tooltip for decision tree */
        .tree-node-tooltip {
            display: none;
            background: rgba(0, 0, 0, 0.9);
            border: 1px solid var(--accent);
            border-radius: 10px;
            padding: 1rem 1.5rem;
            margin-top: 0.5rem;
            font-style: italic;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }

        .tree-node-tooltip.active {
            display: block;
        }

        .tree-node-hint {
            font-size: 0.75rem;
            color: var(--text-secondary);
            margin-top: 0.5rem;
            opacity: 0.7;
        }

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

        .nav-toggle span {
            display: block;
            width: 25px;
            height: 2px;
            background: var(--text-primary);
            transition: transform 0.3s, opacity 0.3s;
        }

        .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);
        }

        /* Footer */
        footer {
            text-align: center;
            padding: 4rem 3rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 4rem;
        }

        .footer-quote {
            font-size: 1.5rem;
            font-style: italic;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 2rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(10, 10, 15, 0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 1.5rem 3rem;
                gap: 1rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav-links.open { display: flex; }
            .timeline-item { flex-direction: column !important; }
            .timeline-content { width: 100%; }
            .timeline-line { left: 20px; }
            .timeline-dot { left: 20px; }
            .tree-branches { flex-direction: column; gap: 1rem; }
            .tree-branches::before { display: none; }
        }

        /* Scroll Animations */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s, transform 0.6s;
        }

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