/* Stack 2.9 - Styles */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #15151f;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #a855f7;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(99, 102, 241, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(168, 85, 247, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.5rem; }

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-github {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.nav-github:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

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

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

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

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    z-index: -1;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease;
}

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

.hero-title {
    margin-bottom: 24px;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
}

.star-count {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.875rem;
}

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

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    background: transparent;
    transition: all var(--transition-fast);
}

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

/* Code Editor Demo */
.hero-demo {
    animation: fadeInUp 0.8s ease 0.2s both;
}

.code-editor {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.editor-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

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

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

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28ca42; }

.editor-title {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-family: 'Fira Code', monospace;
}

.editor-content {
    padding: 20px;
    min-height: 300px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

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

.code-line {
    display: flex;
    gap: 16px;
}

.line-number {
    color: var(--text-muted);
    user-select: none;
    min-width: 24px;
    text-align: right;
}

.line-content {
    color: var(--text-primary);
}

.keyword { color: #c792ea; }
.string { color: #c3e88d; }
.function { color: #82aaff; }
.comment { color: #546e7a; }
.operator { color: #89ddff; }
.variable { color: #f78c6c; }

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

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

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Benchmarks Preview */
.benchmarks-preview {
    padding: 100px 0;
}

.benchmark-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.benchmark-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.benchmark-card.highlight {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.benchmark-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.benchmark-label {
    color: var(--text-secondary);
    margin: 8px 0 16px;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.benchmark-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.benchmark-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    transition: width 1s ease;
}

.benchmark-fill.pulse {
    animation: pulse 2s infinite;
}

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

.benchmarks-preview .btn-outline {
    display: block;
    width: fit-content;
    margin: 0 auto;
}

/* Demo Section */
.demo {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.demo-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    align-items: start;
}

.demo-terminal {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.terminal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.terminal-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.terminal-clear:hover {
    color: var(--text-primary);
}

.terminal-body {
    padding: 16px;
    min-height: 300px;
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
}

.terminal-line {
    margin-bottom: 8px;
    line-height: 1.6;
}

.terminal-line.system {
    color: var(--text-muted);
}

.terminal-line.user {
    color: var(--text-primary);
}

.terminal-line.assistant {
    color: var(--success);
}

.terminal-input {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

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

.terminal-input input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    outline: none;
}

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

.demo-commands {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.demo-commands p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.875rem;
}

.demo-cmd {
    display: block;
    width: 100%;
    padding: 10px 16px;
    margin-bottom: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
}

.demo-cmd:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-width: 140px;
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0 auto 12px;
}

.step h3 {
    margin-bottom: 8px;
    font-size: 1.125rem;
}

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

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

/* FAQ Section */
.faq {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--border-glow);
}

.faq-item h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer */
.footer {
    padding: 60px 0 24px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-brand span {
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin: 0 auto 32px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .demo-container {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .features-grid, .benchmark-grid, .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: 100px 24px 60px;
    }
}

/* Animations */
@keyframes glow {
    0%, 100% { box-shadow: var(--shadow-glow); }
    50% { box-shadow: 0 0 60px rgba(99, 102, 241, 0.4); }
}

.feature-card:hover {
    animation: glow 2s infinite;
}

/* Benchmark Page Styles */
.benchmark-hero {
    padding: 160px 0 80px;
    text-align: center;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.benchmark-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
    z-index: 0;
}

.benchmark-hero .container {
    position: relative;
    z-index: 1;
}

.benchmark-hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 16px;
}

.benchmark-hero .subtitle {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: 48px;
}

.benchmark-summary {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.summary-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px 32px;
    min-width: 140px;
}

.summary-card.highlight {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.summary-value {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.summary-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 8px;
}

.benchmark-charts {
    padding: 80px 0;
}

.chart-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-color);
    height: 400px;
    margin-bottom: 24px;
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.benchmark-comparison {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.comparison-table-wrapper {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.comparison-table td {
    color: var(--text-primary);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table .highlight-row {
    background: rgba(99, 102, 241, 0.1);
}

.comparison-table .highlight-row td {
    border-bottom: 1px solid var(--accent-primary);
}

.comparison-table .best {
    color: var(--success);
    font-weight: 600;
}

.tool-use-section {
    padding: 80px 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

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

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.tool-header h3 {
    font-size: 1.125rem;
}

.tool-score {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--success);
}

.tool-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.tool-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
}

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

.methodology {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.methodology-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.methodology-card h3 {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--accent-primary);
}

.methodology-card ul,
.methodology-card ol {
    color: var(--text-secondary);
    padding-left: 20px;
}

.methodology-card li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.self-evolution-demo {
    padding: 80px 0;
}

.evolution-chart-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-color);
    height: 350px;
    margin-bottom: 16px;
}

.evolution-note {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .benchmark-summary {
        gap: 16px;
    }
    
    .summary-card {
        padding: 20px;
        min-width: 100px;
    }
    
    .summary-value {
        font-size: 1.5rem;
    }
    
    .chart-container {
        height: 300px;
        padding: 16px;
    }
    
    .tool-grid {
        grid-template-columns: 1fr;
    }
}