:root {
    /* Colors */
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --secondary: #10B981;
    --background: #0A0E1A;
    --surface: #1A1F35;
    --surface-light: #242B42;
    --text: #E5E7EB;
    --text-muted: #9CA3AF;
    --border: #2D3548;
    --gradient-from: #3B82F6;
    --gradient-to: #8B5CF6;
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 120px;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.brand-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}

.version-badge {
    background: var(--surface);
    color: var(--text-muted);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.github-link {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-large {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

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

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

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

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

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

/* Hero Section */
.hero {
    padding: 160px 0 120px;
    position: relative;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 24px;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

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

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-from), var(--gradient-to));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    gap: 64px;
    justify-content: center;
    margin-bottom: 80px;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gradient-from), var(--gradient-to));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Terminal Demo */
.hero-demo {
    max-width: 900px;
    margin: 0 auto;
}

.terminal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    background: var(--surface-light);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.terminal-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border);
}

.terminal-dots span:nth-child(1) { background: #EF4444; }
.terminal-dots span:nth-child(2) { background: #F59E0B; }
.terminal-dots span:nth-child(3) { background: #10B981; }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
}

.terminal-body {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.8;
}

.terminal-line {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
}

.prompt {
    color: var(--primary);
    font-weight: 600;
}

.cursor {
    animation: blink 1s infinite;
}

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

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

.output .info { color: #3B82F6; }
.output .success { color: #10B981; }
.output .warning { color: #F59E0B; }
.output.indent { padding-left: 24px; }

/* Section Styles */
section {
    padding: var(--section-padding) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-badge {
    display: inline-block;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 20px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Problem Section */
.problem-section {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.problem-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
}

.problem-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.problem-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

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

/* Loop Diagram */
.loop-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.loop-step {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    min-width: 180px;
    text-align: center;
    transition: all 0.3s;
}

.loop-step:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

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

.loop-arrow {
    font-size: 32px;
    color: var(--primary);
}

.loop-arrow-back {
    flex-basis: 100%;
    text-align: center;
    font-size: 48px;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    transition: all 0.3s;
}

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

.feature-card.featured {
    border-color: var(--primary);
    position: relative;
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

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

.feature-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 24px;
    font-size: 12px;
    font-weight: 600;
}

/* Code Showcase */
.code-showcase {
    max-width: 800px;
    margin: 0 auto;
}

.code-step {
    margin-bottom: 32px;
}

.step-label {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.step-badge {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
}

.step-title {
    font-size: 18px;
    font-weight: 600;
}

.code-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    position: relative;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
}

.code-block code {
    color: var(--text);
}

.keyword { color: #C792EA; }
.function { color: #82AAFF; }
.string { color: #C3E88D; }
.comment { color: var(--text-muted); }
.class { color: #FFCB6B; }
.success { color: var(--success); }
.info { color: var(--primary); }

.code-arrow {
    text-align: center;
    font-size: 32px;
    color: var(--primary);
    margin: 16px 0;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
}

.tool-logo {
    font-size: 48px;
    margin-bottom: 16px;
}

.tool-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.tool-status {
    font-size: 14px;
    font-weight: 600;
}

/* Install Steps */
.install-steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 32px;
}

.install-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.install-step .step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
}

.install-step .step-content {
    flex: 1;
}

.install-step h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.install-step .code-block {
    margin-top: 12px;
}

.copy-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--surface-light);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.install-note {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.install-note p {
    color: var(--text-muted);
}

.install-note a {
    color: var(--primary);
    text-decoration: none;
}

.install-note a:hover {
    text-decoration: underline;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--gradient-from), var(--gradient-to));
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.cta-section .btn-primary {
    background: white;
    color: var(--primary);
}

.cta-section .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

.cta-section .btn-secondary {
    background: transparent;
    border-color: white;
    color: white;
}

.cta-section .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 64px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo {
    width: 32px;
    height: 32px;
}

.footer-logo span {
    font-size: 20px;
    font-weight: 700;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.footer-column a {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 12px;
    transition: color 0.2s;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 14px;
}

.footer-meta {
    display: flex;
    gap: 16px;
    align-items: center;
}

.footer-meta a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-meta a:hover {
    color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 32px;
    }
    
    .section-header h2 {
        font-size: 36px;
    }
    
    .nav-links {
        display: none;
    }
    
    .loop-diagram {
        flex-direction: column;
    }
    
    .loop-arrow {
        transform: rotate(90deg);
    }
    
    .loop-arrow-back {
        transform: rotate(180deg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
    }
    
    .install-step {
        flex-direction: column;
    }
}