:root {
  --ink: #0f172a;
  --text: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --soft: #f8fafc;
  --brand: #4f46e5;
  --brand-ink: #ffffff;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f1f5f9;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
    --bg: #0b1120;
    --soft: #111a2e;
    --brand: #818cf8;
    --brand-ink: #0b1120;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--text); background: var(--bg); }
a { color: inherit; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); text-decoration: none; font-size: 18px; }
.logo img { width: 28px; height: 28px; }
nav.links a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav.links a:hover { color: var(--ink); }
.btn { display: inline-block; background: var(--brand); color: var(--brand-ink); padding: 12px 22px; border-radius: 999px; font-weight: 600; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.hero { padding: 88px 0 64px; }
.hero h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.08; letter-spacing: -0.02em; color: var(--ink); margin: 0 0 20px; max-width: 760px; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 640px; margin: 0 0 32px; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; }
.call { margin-top: 56px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--soft); padding: 24px; max-width: 560px; }
.call .who { font-weight: 600; color: var(--ink); }
.call .meta { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.bubble { border-radius: 16px; padding: 10px 14px; margin: 8px 0; max-width: 85%; font-size: 15px; }
.bubble.ai { background: var(--bg); border: 1px solid var(--line); }
.bubble.rep { background: var(--brand); color: var(--brand-ink); margin-left: auto; }
.timing { font: 12px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--muted); margin-top: 12px; }
section { padding: 64px 0; border-top: 1px solid var(--line); }
section h2 { font-size: clamp(24px, 3.5vw, 32px); color: var(--ink); margin: 0 0 12px; letter-spacing: -0.01em; }
section p.sub { color: var(--muted); margin: 0 0 36px; max-width: 640px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: var(--bg); }
.card h3 { margin: 0 0 6px; font-size: 17px; color: var(--ink); }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.step { font: 600 13px/1 ui-monospace, monospace; color: var(--brand); margin-bottom: 10px; }
.cta { text-align: center; }
.cta p.sub { margin-left: auto; margin-right: auto; }
footer.bottom { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer.bottom .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer.bottom a { color: var(--muted); margin-right: 16px; }
.doc { max-width: 720px; padding: 48px 0 24px; }
.doc h1 { font-size: 32px; color: var(--ink); margin: 0 0 6px; }
.doc .updated { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 19px; color: var(--ink); margin: 32px 0 8px; }
.doc ul { padding-left: 20px; }
@media (max-width: 600px) {
  nav.links a:not(.btn) { display: none; }
  .hero { padding: 56px 0 40px; }
  section { padding: 48px 0; }
}