:root {
  --canvas: #fcfcfc;
  --surface: #f9f9f9;
  --surface-raised: #ffffff;
  --border: #e0e0e0;
  --border-subtle: #ececec;
  --text-primary: #0d0d0d;
  --text-secondary: #5f5f5f;
  --text-muted: #8f8f8f;
  --gloss: #5f5f5f;
  --focus-ring: #0d0d0d;
  --measure: 1040px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text-primary);
  font-family: "PingFang SC", "Microsoft YaHei UI", "Segoe UI Variable", "Segoe UI", Inter, ui-sans-serif, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: inherit; text-underline-offset: 3px; }
a:focus-visible, .button:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 24px; }

.site-header { border-bottom: 1px solid var(--border-subtle); background: var(--canvas); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-size: 18px; font-weight: 600; letter-spacing: 0.04em; }
.brand svg { width: 28px; height: 28px; }
.site-nav { display: flex; gap: 24px; font-size: 14px; color: var(--text-secondary); }
.site-nav a { text-decoration: none; }
.site-nav a:hover { color: var(--text-primary); }

.hero { padding: 88px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.hero h1 { margin: 0 0 20px; font-size: 44px; line-height: 1.25; font-weight: 600; letter-spacing: 0.01em; }
.hero p { margin: 0 0 28px; font-size: 18px; color: var(--text-secondary); max-width: 30em; }
.status { display: inline-block; padding: 8px 16px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-raised); font-size: 14px; color: var(--text-secondary); }

.sample { border: 1px solid var(--border); border-radius: 12px; background: var(--surface-raised); padding: 32px 32px 28px; }
.sample-label { margin: 0 0 20px; font-size: 13px; color: var(--text-muted); }
.sample-text { margin: 0; font-family: Georgia, "Times New Roman", "Songti SC", serif; font-size: 19px; line-height: 2.5; color: var(--text-primary); }
.gloss { position: relative; display: inline-block; line-height: 1.2; }
.gloss::after { content: attr(data-gloss); position: absolute; left: 50%; top: 100%; transform: translateX(-50%); margin-top: 2px; white-space: nowrap; font-family: "PingFang SC", "Microsoft YaHei UI", sans-serif; font-size: 12px; color: var(--gloss); }

section { padding: 64px 0; border-top: 1px solid var(--border-subtle); }
section h2 { margin: 0 0 32px; font-size: 26px; font-weight: 600; }

.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { border: 1px solid var(--border); border-radius: 12px; background: var(--surface-raised); padding: 24px; }
.card h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; }
.card p { margin: 0; font-size: 15px; color: var(--text-secondary); }
.feature-state { margin: 0 0 16px; font-size: 15px; font-weight: 600; color: var(--text-secondary); }
.grid + .feature-state { margin-top: 40px; }
.planned { margin: 0 0 16px; padding-left: 20px; font-size: 15px; line-height: 1.8; color: var(--text-secondary); }
#features > .wrap > p { margin: 0; font-size: 14px; color: var(--text-muted); }

.steps { margin: 0; padding: 0; list-style: none; counter-reset: step; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.steps li { counter-increment: step; padding-top: 16px; border-top: 2px solid var(--text-primary); }
.steps li::before { content: counter(step, decimal-leading-zero); display: block; margin-bottom: 8px; font-size: 13px; color: var(--text-muted); }
.steps strong { display: block; margin-bottom: 4px; font-size: 17px; font-weight: 600; }
.steps span { font-size: 15px; color: var(--text-secondary); }

.notice p { margin: 0 0 12px; max-width: 44em; color: var(--text-secondary); }
.notice p:last-child { margin-bottom: 0; }

.site-footer { border-top: 1px solid var(--border-subtle); background: var(--surface); padding: 40px 0 48px; font-size: 14px; color: var(--text-secondary); }
.site-footer .wrap { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 32px; }
.site-footer p { margin: 0 0 6px; }
.site-footer nav { display: flex; flex-direction: column; gap: 6px; }
.site-footer .legal-line { grid-column: 1 / -1; padding-top: 20px; border-top: 1px solid var(--border-subtle); color: var(--text-muted); display: flex; flex-wrap: wrap; gap: 8px 20px; }

.doc { padding: 56px 0 72px; }
.doc .wrap { max-width: 760px; }
.doc h1 { margin: 0 0 8px; font-size: 32px; font-weight: 600; }
.doc .meta { margin: 0 0 32px; font-size: 14px; color: var(--text-muted); }
.doc h2 { margin: 40px 0 12px; font-size: 20px; font-weight: 600; }
.doc p, .doc li { color: var(--text-primary); font-size: 16px; }
.doc ul, .doc ol { padding-left: 1.4em; }
.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
.doc th, .doc td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; vertical-align: top; }
.doc th { background: var(--surface); font-weight: 600; }
.draft-banner { margin: 0 0 32px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); font-size: 14px; color: var(--text-secondary); }

@media (max-width: 800px) {
  .hero { padding: 56px 0 48px; }
  .hero .wrap, .grid, .steps, .site-footer .wrap { grid-template-columns: minmax(0, 1fr); }
  .hero h1 { font-size: 32px; }
  .site-nav { gap: 16px; }
  .sample { padding: 24px 20px; }
  .sample-text { font-size: 17px; }
}