:root {
  --bg: #0a0c10;
  --bg-alt: #0f1218;
  --panel: #141821;
  --panel-2: #1a1f2b;
  --border: #232a37;
  --border-soft: #1c2230;
  --text: #e8ebf1;
  --muted: #9aa4b4;
  --faint: #6a7383;
  --accent: #7c8cff;

  --doc: #f0b429;
  --shape: #8b96ff;
  --build: #4fd6c4;
  --gate: #fb7185;
  --diag: #38bdf8;
  --util: #c084fc;

  --maxw: 940px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
a { color: var(--accent); text-decoration: none; }

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(124, 140, 255, 0.12);
  color: #c3ccff;
  padding: 0.1em 0.42em;
  border-radius: 5px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10, 12, 16, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); display: inline-flex; align-items: center; gap: 7px; letter-spacing: -0.01em; }
.brand-mark { color: var(--accent); }
.brand-dim { color: var(--faint); font-weight: 500; }
.nav-links { display: flex; gap: 26px; font-size: 0.92rem; }
.nav-links a { color: var(--muted); transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero { position: relative; padding: 92px 0 40px; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(680px 340px at 12% -15%, rgba(124, 140, 255, 0.2), transparent 70%),
    radial-gradient(560px 300px at 100% -5%, rgba(79, 214, 196, 0.1), transparent 70%);
  pointer-events: none;
}
.hero .wrap { position: relative; }
.eyebrow { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--build); margin: 0 0 18px; }
.hero h1 { font-size: clamp(2.2rem, 5.4vw, 3.7rem); letter-spacing: -0.03em; line-height: 1.06; font-weight: 800; margin: 0 0 22px; }
.lede { font-size: 1.13rem; color: var(--muted); max-width: 640px; margin: 0 0 30px; }
.lede strong { color: var(--text); font-weight: 600; }
.cta-row { display: flex; gap: 13px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; font-weight: 600; font-size: 0.96rem; padding: 11px 22px; border-radius: 10px; transition: transform 0.12s, background 0.15s, border-color 0.15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(180deg, #8997ff, #5e6dff); color: #fff; box-shadow: 0 8px 22px rgba(94, 109, 255, 0.32); }
.btn-primary:hover { filter: brightness(1.07); }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }

.hero-legend { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--border-soft); }
.lg { display: inline-flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--muted); }
.lg i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.dot-doc { background: var(--doc); } .dot-shape { background: var(--shape); }
.dot-build { background: var(--build); } .dot-gate { background: var(--gate); }
.dot-diag { background: var(--diag); }

/* Blocks */
.block { padding: 66px 0; border-top: 1px solid var(--border-soft); }
.block.alt { background: var(--bg-alt); }
.block-title { font-size: 1.55rem; letter-spacing: -0.02em; margin: 0 0 6px; }
.block-sub { color: var(--muted); margin: 0 0 32px; font-size: 1.02rem; }
section { scroll-margin-top: 72px; }

/* Where to start */
.start-list { border: 1px solid var(--border); border-radius: 13px; overflow: hidden; background: var(--panel); }
.start-row { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 16px; padding: 15px 20px; border-bottom: 1px solid var(--border-soft); color: var(--text); transition: background 0.12s; }
.start-row:last-child { border-bottom: none; }
.start-row:not(.plain):hover { background: var(--panel-2); }
.situation { font-weight: 500; }
.entry { font-size: 0.86rem; color: var(--muted); text-align: right; }
.goto { font-size: 0.8rem; color: var(--faint); white-space: nowrap; min-width: 140px; text-align: right; transition: color 0.12s; }
.start-row:not(.plain):hover .goto { color: var(--accent); }
.start-row.plain { color: var(--faint); }
.start-row.plain .situation { font-weight: 400; }

/* Flows */
.flow-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 22px 24px; margin-bottom: 16px; }
.flow-card:last-child { margin-bottom: 0; }
.flow-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.flow-head h3 { margin: 0; font-size: 1.14rem; letter-spacing: -0.01em; }
.badge { font-family: var(--mono); font-size: 0.7rem; color: var(--faint); background: var(--bg); border: 1px solid var(--border-soft); padding: 3px 9px; border-radius: 999px; }
.flow-desc { margin: 8px 0 18px; color: var(--muted); font-size: 0.95rem; }

.chain { display: flex; align-items: stretch; flex-wrap: wrap; gap: 8px; }
.step { display: flex; flex-direction: column; justify-content: center; gap: 2px; padding: 9px 14px; border-radius: 10px; background: var(--bg); border: 1px solid var(--border); border-left-width: 3px; min-width: 0; }
.step b { font-family: var(--mono); font-weight: 500; font-size: 0.86rem; color: var(--text); }
.step i { font-style: normal; font-size: 0.72rem; color: var(--faint); }
.arrow { display: flex; align-items: center; color: var(--faint); font-size: 1rem; }
.s-doc { border-left-color: var(--doc); }
.s-shape { border-left-color: var(--shape); }
.s-build { border-left-color: var(--build); }
.s-gate { border-left-color: var(--gate); }
.s-diag { border-left-color: var(--diag); }
.s-merge { background: linear-gradient(180deg, #8997ff, #5e6dff); border: none; }
.s-merge b { color: #fff; }
.s-next { border-left-color: var(--accent); border-style: dashed; }
.s-next b { color: var(--accent); }

/* Cross-cutting */
.cross-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.cross { background: var(--panel); border: 1px solid var(--border); border-radius: 13px; padding: 20px 22px; }
.cross h4 { margin: 0 0 9px; font-family: var(--mono); font-weight: 500; font-size: 0.96rem; display: flex; align-items: center; gap: 10px; }
.kind { font-family: "Inter", sans-serif; font-weight: 600; font-size: 0.64rem; text-transform: uppercase; letter-spacing: 0.06em; padding: 2px 8px; border-radius: 999px; }
.k-lens { color: var(--doc); background: rgba(240, 180, 41, 0.14); }
.k-gate { color: var(--gate); background: rgba(251, 113, 133, 0.14); }
.k-util { color: var(--util); background: rgba(192, 132, 252, 0.14); }
.k-meas { color: var(--build); background: rgba(79, 214, 196, 0.14); }
.cross p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* Install */
.install-wrap { max-width: 660px; }
.terminal { background: var(--panel); border: 1px solid var(--border); border-radius: 13px; overflow: hidden; box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4); margin-bottom: 18px; }
.terminal-bar { display: flex; align-items: center; gap: 8px; padding: 11px 15px; background: var(--panel-2); border-bottom: 1px solid var(--border); }
.t-dot { width: 11px; height: 11px; border-radius: 50%; }
.t-dot.red { background: #ff5f56; } .t-dot.yellow { background: #ffbd2e; } .t-dot.green { background: #27c93f; }
.terminal-title { margin-left: auto; font-family: var(--mono); font-size: 0.76rem; color: var(--faint); }
.terminal-body { margin: 0; padding: 18px 20px; font-family: var(--mono); font-size: 0.9rem; line-height: 1.85; overflow-x: auto; }
.terminal-body code { background: none; color: var(--text); padding: 0; }
.prompt { color: var(--build); user-select: none; }
.comment { color: var(--faint); }
.install-note { color: var(--muted); font-size: 0.94rem; margin: 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border-soft); padding: 32px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { display: flex; flex-direction: column; gap: 4px; }
.footer-tag { font-size: 0.85rem; color: var(--faint); }
.footer-links { display: flex; align-items: center; gap: 20px; font-size: 0.9rem; }
.footer-links a { color: var(--muted); } .footer-links a:hover { color: var(--text); }
.license { font-family: var(--mono); font-size: 0.8rem; color: var(--faint); }

/* Responsive */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .start-row { grid-template-columns: 1fr; gap: 5px; }
  .entry, .goto { text-align: left; min-width: 0; }
  .cross-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 32px; }
  .chain { flex-direction: column; align-items: stretch; }
  .arrow { transform: rotate(90deg); height: 14px; justify-content: center; }
}