:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #1b1d22;
  --muted: #5b606b;
  --line: #e4e1da;
  --accent: #2f5d50;
  --accent-ink: #ffffff;
  --accent-soft: #e6efe9;
  --warn-bg: #fff6e0;
  --warn-line: #e9cf8a;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --surface: #1a1d20;
    --ink: #eceae4;
    --muted: #a3a7ad;
    --line: #2c3035;
    --accent: #7fbfa8;
    --accent-ink: #0d1512;
    --accent-soft: #1d2a25;
    --warn-bg: #2a2416;
    --warn-line: #5c4a1f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
header.site { border-bottom: 1px solid var(--line); background: var(--surface); }
header.site .wrap { display: flex; align-items: center; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.logo { font-weight: 800; letter-spacing: -0.02em; font-size: 20px; color: var(--ink); text-decoration: none; }
nav.top { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
nav.top a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav.top a:hover { color: var(--ink); }
.hero { padding-top: 64px; padding-bottom: 40px; }
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.1; letter-spacing: -0.03em; margin: 0 0 16px; max-width: 18ch; }
.hero p.lede { font-size: 19px; color: var(--muted); max-width: 60ch; margin: 0 0 24px; }
.btn { display: inline-block; padding: 12px 20px; border-radius: 10px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); cursor: pointer; font-size: 16px; }
.btn.secondary { background: transparent; color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
section { padding: 40px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 28px; letter-spacing: -0.02em; margin: 0 0 12px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
.price { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; margin: 8px 0 0; }
.price small { font-size: 15px; font-weight: 500; color: var(--muted); }
.card ul { padding-left: 18px; color: var(--muted); margin: 12px 0 16px; }
.note { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: var(--radius); padding: 14px 16px; }
.muted { color: var(--muted); }
.key { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 13px; word-break: break-all;
  background: var(--accent-soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
textarea, input[type=text] { width: 100%; font: inherit; padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink); }
label.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; color: var(--muted); margin: 8px 0 12px; }
.doc { max-width: 760px; padding-top: 40px; padding-bottom: 64px; }
.doc h1 { font-size: 34px; letter-spacing: -0.02em; margin: 0 0 4px; }
.doc h2 { font-size: 21px; margin: 28px 0 8px; }
.doc table { border-collapse: collapse; width: 100%; font-size: 15px; }
.doc th, .doc td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 8px 8px 0; vertical-align: top; }
.table-scroll { overflow-x: auto; }
footer.site { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer.site nav { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 10px; }
footer.site a { color: var(--muted); }
.mt12 { margin-top: 12px; }
.mt16 { margin-top: 16px; }
.mb8 { margin: 0 0 8px; }
.m0 { margin: 0; }