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

:root {
  --bg: #09090b; --bg-card: #131316; --bg-card-hover: #1a1a1f;
  --border: #27272a; --border-hover: #3f3f46;
  --text: #e4e4e7; --text-dim: #a1a1aa; --text-muted: #71717a;
  --accent: #22c55e; --accent-dim: #16a34a; --accent-glow: rgba(34, 197, 94, 0.15);
  --gold: #f5c542; --gold-dim: #c49b30;
  --link: #60a5fa; --link-hover: #93bbfd;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans); background: var(--bg); color: var(--text);
  line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--link-hover); }

code { font-family: var(--mono); font-size: 0.875em; background: rgba(255,255,255,0.06); padding: 0.15em 0.4em; border-radius: 4px; }

.container { max-width: 860px; margin: 0 auto; padding: 0 1.5rem; width: 100%; }

.site-header { border-bottom: 1px solid var(--border); padding: 1rem 0; position: sticky; top: 0; background: rgba(9,9,11,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.header-brand { display: flex; align-items: center; gap: 0.75rem; }
.header-logo { font-family: var(--mono); font-size: 0.875rem; font-weight: 700; color: var(--text); letter-spacing: -0.02em; }
.header-logo .prompt { color: var(--accent); }
.header-nav { display: flex; gap: 1.5rem; list-style: none; }
.header-nav a { font-size: 0.8125rem; color: var(--text-dim); font-weight: 500; transition: color 0.2s; }
.header-nav a:hover { color: var(--text); }

.hero { padding: 4rem 0 3rem; border-bottom: 1px solid var(--border); }
.hero-badge { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--mono); font-size: 0.75rem; font-weight: 600; color: var(--text-dim); background: rgba(255,255,255,0.05); border: 1px solid var(--border); padding: 0.35rem 0.75rem; border-radius: 100px; margin-bottom: 1.25rem; letter-spacing: 0.02em; }
.hero h1 { font-size: clamp(1.75rem,4vw,2.5rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 1rem; }
.hero h1 .highlight { color: #7D64FF; }
.hero-desc { font-size: 1.0625rem; color: var(--text-dim); max-width: 600px; line-height: 1.7; }
.hero-desc a { font-weight: 500; }
.hero-links { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--mono); font-size: 0.8125rem; font-weight: 600; padding: 0.6rem 1.25rem; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-card); color: var(--text); transition: all 0.2s; cursor: pointer; }
.btn:hover { background: var(--bg-card-hover); border-color: var(--border-hover); color: var(--text); }
.btn-primary { background: rgba(125,100,255,0.15); border-color: #7D64FF; color: #A494FF; }
.btn-primary:hover { background: rgba(125,100,255,0.25); }

section { padding: 3rem 0; }
section + section { border-top: 1px solid var(--border); }
.section-label { font-family: var(--mono); font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 0.75rem; }
.section-title { font-size: 1.375rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 1rem; }
.section-text { color: var(--text-dim); line-height: 1.7; margin-bottom: 1rem; }

.origin-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; margin-top: 1rem; margin-bottom: 1rem; display: flex; align-items: flex-start; gap: 0.75rem; }
.origin-icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 0.1rem; }
.origin-text { font-size: 0.875rem; color: var(--text-dim); line-height: 1.6; }
.origin-text a { font-weight: 600; }
.origin-text strong { color: var(--accent); }

.arch-block { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1.5rem; margin-top: 1.25rem; font-family: var(--mono); font-size: 0.8125rem; line-height: 1.8; color: var(--text-dim); overflow-x: auto; }
.arch-block .comment { color: var(--text-muted); }
.arch-block .keyword { color: #7D64FF; }
.arch-block .string { color: var(--gold); }

.scenario-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 0.75rem; margin-top: 1.25rem; }
.scenario-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; transition: border-color 0.2s, background 0.2s; }
.scenario-card:hover { border-color: var(--border-hover); background: var(--bg-card-hover); }
.scenario-name { font-family: var(--mono); font-size: 0.8125rem; font-weight: 600; color: #7D64FF; margin-bottom: 0.35rem; }
.scenario-desc { font-size: 0.8125rem; color: var(--text-dim); line-height: 1.5; }
.scenario-meta { font-family: var(--mono); font-size: 0.6875rem; color: var(--text-muted); margin-top: 0.5rem; }

.stack-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.75rem; margin-top: 1.25rem; }
.stack-item { display: flex; align-items: center; gap: 0.75rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; transition: border-color 0.2s, background 0.2s; }
.stack-item:hover { border-color: var(--border-hover); background: var(--bg-card-hover); }
.stack-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.stack-name { font-size: 0.875rem; font-weight: 500; }
.stack-desc { font-size: 0.75rem; color: var(--text-muted); }

.impl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.75rem; margin-top: 1.25rem; }
.impl-card { display: flex; align-items: center; gap: 0.75rem; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; transition: border-color 0.2s, background 0.2s; color: var(--text); }
.impl-card:hover { border-color: var(--border-hover); background: var(--bg-card-hover); color: var(--text); }
.impl-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.impl-name { font-size: 0.875rem; font-weight: 500; }
.impl-badge { font-family: var(--mono); font-size: 0.625rem; font-weight: 600; color: var(--accent); background: var(--accent-glow); border: 1px solid rgba(34,197,94,0.3); padding: 0.15rem 0.4rem; border-radius: 4px; margin-left: auto; }
.impl-badge-learning { font-family: var(--mono); font-size: 0.625rem; font-weight: 600; color: #60a5fa; background: rgba(96,165,250,0.15); border: 1px solid rgba(96,165,250,0.3); padding: 0.15rem 0.4rem; border-radius: 4px; margin-left: auto; }

.site-footer { margin-top: auto; border-top: 1px solid var(--border); padding: 2rem 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-text { font-size: 0.8125rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 1rem; }
.footer-links a { font-size: 0.8125rem; color: var(--text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 640px) {
  .hero { padding: 2.5rem 0 2rem; }
  section { padding: 2rem 0; }
  .header-nav { gap: 1rem; }
  .scenario-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: 1fr; }
  .impl-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}