/* ============================================
   agent-builder — Official Site
   Aesthetic: Dark / Terminal / Hacker
   ============================================ */

:root {
    --bg: #0a0a0f;
    --bg-elevated: #0f0f18;
    --bg-card: #13131d;
    --surface: #1a1a28;
    --border: #2a2a3d;
    --text: #e8e8f0;
    --text-dim: #8888a8;
    --accent: #00ff88;
    --accent-dim: rgba(0, 255, 136, 0.15);
    --accent2: #6c5ce7;
    --accent2-dim: rgba(108, 92, 231, 0.15);
    --danger: #ff4757;
    --warning: #ffa502;
    --radius: 12px;
    --radius-sm: 8px;
}

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

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Noise overlay */
.noise {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =================== HEADER =================== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon { font-size: 1.3rem; }
.logo-text { color: var(--text); font-family: 'Space Mono', monospace; }

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

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

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

.btn-github {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.btn-github:hover {
    color: var(--text);
    border-color: var(--text);
    background: var(--surface);
}

/* =================== HERO =================== */
.hero {
    position: relative;
    padding: 160px 0 100px;
    text-align: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 500px;
    background: radial-gradient(ellipse, rgba(0, 255, 136, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent-dim);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 100px;
    padding: 6px 18px;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 32px;
    font-family: 'Space Mono', monospace;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, #00d4ff 50%, var(--accent2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: grad-shift 4s ease infinite;
}

@keyframes grad-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-dim);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: var(--bg);
    font-weight: 700;
    text-decoration: none;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(0, 255, 136, 0.25);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    text-decoration: none;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

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

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-size: 1.5rem;
    font-weight: 900;
    font-family: 'Space Mono', monospace;
    color: var(--accent);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* =================== SECTIONS =================== */
section { padding: 100px 0; }

.section-title {
    font-size: 2rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-desc {
    text-align: center;
    color: var(--text-dim);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto 60px;
}

/* =================== FEATURES =================== */
.features { background: var(--bg-elevated); }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: rgba(0, 255, 136, 0.2);
    transform: translateY(-3px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.88rem;
    color: var(--text-dim);
    line-height: 1.7;
}

/* =================== STACK =================== */
.stack-layout {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stack-layer {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 28px;
    transition: all 0.2s;
}

.stack-layer:hover {
    border-color: var(--accent);
}

.layer-label {
    font-family: 'Space Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 700;
    min-width: 120px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.layer-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-pill {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 100px;
    padding: 6px 14px;
    font-size: 0.82rem;
    color: var(--text-dim);
    font-family: 'Space Mono', monospace;
}

/* =================== NODES =================== */
.nodes { background: var(--bg-elevated); }

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.node-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

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

.node-num {
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
    font-weight: 700;
    display: block;
    margin-bottom: 6px;
}

.node-card h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text);
}

.node-card p {
    font-size: 0.75rem;
    color: var(--text-dim);
    line-height: 1.5;
}

/* =================== COMPARE =================== */
.compare-table-wrap {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
}

.compare-table th {
    text-align: left;
    padding: 16px 20px;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
    font-family: 'Space Mono', monospace;
}

.compare-table td {
    padding: 14px 20px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
}

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

.compare-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.tag-green { color: var(--accent); font-weight: 600; }
.tag-red { color: var(--danger); font-weight: 600; }
.tag-blue { color: #74b9ff; font-weight: 600; }

/* =================== CTA =================== */
.cta {
    text-align: center;
    padding: 120px 0;
}

.cta-title {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 12px;
}

.cta-desc {
    color: var(--text-dim);
    font-size: 1rem;
    margin-bottom: 36px;
}

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

/* =================== FOOTER =================== */
.footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    background: var(--bg-card);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-desc {
    font-size: 0.82rem;
    color: var(--text-dim);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s;
}

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

.footer-copy {
    font-size: 0.78rem;
    color: var(--text-dim);
    font-family: 'Space Mono', monospace;
}

/* =================== RESPONSIVE =================== */
@media (max-width: 900px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .nodes-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 700px) {
    .nav-links { display: none; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .feature-grid { grid-template-columns: 1fr; }
    .nodes-grid { grid-template-columns: repeat(2, 1fr); }
    .stack-layer { flex-direction: column; align-items: flex-start; gap: 12px; }
    .layer-label { min-width: auto; }
    .compare-table { font-size: 0.8rem; }
    .compare-table th, .compare-table td { padding: 10px 12px; }
    .cta-actions { flex-direction: column; align-items: center; }
    .footer-content { flex-direction: column; text-align: center; }
}