/* ============================================
   dat9.ai - Stylesheet
   Inspired by db9.ai visual style
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #141414;
    --bg-code: #0d0d0d;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #6b6b6b;
    --text-accent: #e0e0e0;
    
    --border-primary: #2a2a2a;
    --border-secondary: #1f1f1f;
    --border-accent: #404040;
    
    --accent-gray: #888888;
    --accent-gray-light: #aaaaaa;
    --accent-gray-dark: #555555;
    --accent-blue: #4a9eff;
    --accent-cyan: #22d3ee;
    --accent-green: #22c55e;
    
    --gradient-start: #ffffff;
    --gradient-end: #888888;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(255, 255, 255, 0.05);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Grid */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-secondary);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1;
}

.logo-text {
    letter-spacing: -0.02em;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.nav-github {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    transition: all 0.2s ease;
}

.nav-github:hover {
    background: var(--bg-card);
    border-color: var(--accent-gray);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 140px 0 80px;
    position: relative;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.badge-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

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

.hero-badge a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-badge a:hover {
    text-decoration: underline;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #888888 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-subtitle code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
}

/* CLI Box */
.cli-box {
    background: var(--bg-code);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    max-width: 600px;
    margin: 0 auto 32px;
    overflow: hidden;
    text-align: left;
}

.cli-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-secondary);
}

.cli-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.cli-copy {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cli-copy:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.cli-code {
    display: block;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--text-primary);
    overflow-x: auto;
}

.cli-meta {
    padding: 8px 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-secondary);
}

/* Agents Section */
.agents-section {
    margin-top: 48px;
}

.agents-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.agents-instruction {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    display: inline-block;
    margin-bottom: 12px;
}

.agents-instruction code {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--text-primary);
}

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

/* Ecosystem */
.ecosystem {
    margin-top: 64px;
}

.ecosystem-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.ecosystem-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px 32px;
}

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

.ecosystem-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

.ecosystem-icon.claude { color: #aaaaaa; }
.ecosystem-icon.codex { color: #888888; }
.ecosystem-icon.cursor { color: #bbbbbb; }
.ecosystem-icon.cline { color: #999999; }
.ecosystem-icon.vscode { color: #cccccc; }
.ecosystem-icon.m9 { color: #777777; }

/* ============================================
   Use Cases Section
   ============================================ */
.use-cases {
    padding: 80px 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.use-case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: all 0.3s ease;
}

.use-case-card:hover {
    border-color: var(--accent-gray);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.use-case-header {
    margin-bottom: 16px;
}

.use-case-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.use-case-header p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.use-case-body {
    margin-bottom: 20px;
}

.use-case-body p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.use-case-footer {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: 80px 0;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02), transparent);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 56px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: 28px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(255, 255, 255, 0.04),
        transparent 40%
    );
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card:hover {
    border-color: var(--accent-gray);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card > p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.code-block {
    background: var(--bg-code);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 16px;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.replaces {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.replaces-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.replaces-item {
    font-size: 0.75rem;
    color: var(--accent-gray);
}

/* ============================================
   Architecture Section
   ============================================ */
.architecture {
    padding: 80px 0;
}

.arch-diagram {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 32px;
}

.arch-layer {
    margin-bottom: 24px;
}

.arch-layer:last-of-type {
    margin-bottom: 0;
}

.arch-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.arch-boxes {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.arch-box {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 20px 28px;
    text-align: center;
    min-width: 120px;
}

.arch-box.center {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.arch-box code {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--accent-purple-light);
}

.arch-box small {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.arch-arrow {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.25rem;
    margin: 8px 0;
}

.storage-small {
    border-color: rgba(255, 255, 255, 0.2);
}

.storage-large {
    border-color: rgba(136, 136, 136, 0.3);
}

.arch-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.arch-feature {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
}

.arch-feature-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.arch-feature h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.arch-feature p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ============================================
   CLI Section
   ============================================ */
/* Highlights Section */
.highlights {
    padding: 40px 0 60px;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.highlight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    transition: all 0.2s ease;
}

.highlight-card:hover {
    border-color: var(--accent-gray);
}

.highlight-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.highlight-card h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.highlight-card p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.cli-section {
    padding: 80px 0;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02), transparent);
}

.cli-examples {
    max-width: 800px;
    margin: 0 auto;
}

.cli-example {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin-bottom: 16px;
    transition: all 0.2s ease;
}

.cli-example:hover {
    border-color: var(--accent-gray);
}

.cli-example-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    font-family: var(--font-mono);
    overflow-x: auto;
}

.cli-example-prompt {
    color: var(--accent-green);
    font-weight: 500;
}

.cli-example-cmd {
    color: var(--text-primary);
    white-space: nowrap;
}

.cli-example-desc {
    font-size: 0.9375rem;
    color: var(--text-muted);
    padding-left: 28px;
}

/* ============================================
   SDK Section
   ============================================ */
.sdk-section {
    padding: 80px 0;
}

.sdk-code {
    max-width: 800px;
    margin: 0 auto;
}

.code-window {
    background: var(--bg-code);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

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

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

.code-window-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-window-dots span:nth-child(1) { background: #ff5f56; }
.code-window-dots span:nth-child(2) { background: #ffbd2e; }
.code-window-dots span:nth-child(3) { background: #27c93f; }

.code-window-title {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.code-window-content {
    padding: 24px;
    overflow-x: auto;
    margin: 0;
}

.code-window-content code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-keyword { color: #aaaaaa; }
.code-string { color: #cccccc; }
.code-function { color: #ffffff; }
.code-comment { color: #555555; }

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.03), transparent);
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.cta-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.cta-cli {
    max-width: 500px;
    margin: 0 auto 40px;
}

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

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.cta-button.primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    border: 1px solid var(--text-primary);
}

.cta-button.primary:hover {
    background: var(--accent-gray-light);
    border-color: var(--accent-gray-light);
    transform: translateY(-1px);
}

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

.cta-button.secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-gray);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 60px 0 32px;
    border-top: 1px solid var(--border-secondary);
}

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

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

.footer-tagline {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

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

.footer-built a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.footer-built a:hover {
    border-bottom-color: var(--text-primary);
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links a {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-secondary);
    text-align: center;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .nav-links a:not(.nav-github) {
        display: none;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .use-cases-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .arch-boxes {
        flex-direction: column;
    }
    
    .arch-box {
        width: 100%;
    }
    
    .arch-features {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .ecosystem-grid {
        gap: 12px 20px;
    }
    
    .ecosystem-item span {
        display: none;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero > .container > * {
    animation: fadeIn 0.6s ease-out forwards;
}

.hero > .container > *:nth-child(1) { animation-delay: 0.1s; }
.hero > .container > *:nth-child(2) { animation-delay: 0.2s; }
.hero > .container > *:nth-child(3) { animation-delay: 0.3s; }
.hero > .container > *:nth-child(4) { animation-delay: 0.4s; }
.hero > .container > *:nth-child(5) { animation-delay: 0.5s; }
.hero > .container > *:nth-child(6) { animation-delay: 0.6s; }