@font-face {
  font-family: "Geist";
  src: url("/assets/fonts/geist-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("/assets/fonts/geist-mono-latin.woff2") format("woff2");
  font-weight: 400 600;
  font-display: swap;
}

:root {
  --ink: #0a0a0a;
  --ink-2: #52524e;
  --ink-3: #8b8b86;
  --line: #e7e7e3;
  --paper: #ffffff;
  --paper-2: #f6f6f4;
  --hl: #e8e8e3;
  --max: 1120px;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-underline-offset: 3px; }
svg { display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding-inline: 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 20; background: var(--ink); color: #fff; padding: 8px 12px; border-radius: 6px; }

/* 顶部提示条：支付开通前的说明 */
.notice-bar {
  padding: 10px 24px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  text-align: center;
  font-size: 13.5px;
  color: var(--ink-2);
}
.notice-bar strong { color: var(--ink); font-weight: 600; }

/* 顶栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 32px; height: 64px; }
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}
.brand svg { width: 22px; height: 22px; fill: currentColor; }
.nav { display: flex; align-items: center; gap: 28px; margin-left: auto; font-size: 14px; }
.nav a { color: var(--ink-2); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font: 500 15px/1 var(--sans);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.btn:hover { background: #2b2b29; }
.btn.secondary { background: transparent; color: var(--ink); border-color: #d2d2cd; }
.btn.secondary:hover { border-color: var(--ink); }
.nav .btn { height: 34px; padding: 0 14px; font-size: 14px; color: #fff; }
.nav .btn:hover { color: #fff; }

/* 首屏 */
.hero { padding: 104px 0 96px; border-bottom: 1px solid var(--line); }
.hero .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.eyebrow {
  margin: 0;
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
h1 {
  margin: 20px 0 24px;
  font-size: clamp(40px, 5.6vw, 64px);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.035em;
}
.lede { margin: 0; max-width: 32em; font-size: 19px; line-height: 1.55; color: var(--ink-2); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

/* 代码卡片 */
.code { min-width: 0; background: var(--paper-2); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font: 12px/1.4 var(--mono);
  color: var(--ink-3);
}
pre { margin: 0; overflow-x: auto; }
:not(pre) > code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper-2);
  font: 0.88em/1.5 var(--mono);
  overflow-wrap: anywhere;
}
.code pre { padding: 20px; font: 13.5px/1.7 var(--mono); }
.code .hl { display: inline-block; min-width: calc(100% + 40px); margin: 0 -20px; padding: 0 20px; background: var(--hl); }
.s { color: #5c5c57; }
.c { color: var(--ink-3); }
.copy {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink-2);
  font: 12px/1 var(--mono);
  padding: 6px 9px;
  cursor: pointer;
}
.copy:hover { border-color: var(--ink-3); color: var(--ink); }

/* 区块 */
.section { padding: 96px 0; border-bottom: 1px solid var(--line); }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 16px 40px; margin-bottom: 48px; }
.section-head p { margin: 0; max-width: 30em; color: var(--ink-2); }
h2 {
  margin: 10px 0 0;
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.028em;
}

/* 三栏：顶部粗线之间留缝，呼应分体 Z */
.trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.trio > div { border-top: 3px solid var(--ink); padding-top: 24px; }
.trio h3 { margin: 0 0 10px; font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.trio p { margin: 0; color: var(--ink-2); }
.step-n { display: block; margin-bottom: 12px; font: 12px/1 var(--mono); color: var(--ink-3); }
.trio .code { margin-top: 20px; }
.trio .code pre { padding: 14px 16px; font-size: 12.5px; }

/* 价格表 */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; min-width: 680px; border-collapse: collapse; font-size: 15px; }
th {
  padding: 14px 20px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  text-align: left;
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
td { padding: 20px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.num { font-size: 17px; font-weight: 500; }
.model-name { font-weight: 600; }
.model-id { display: block; margin-top: 4px; font: 13px/1.4 var(--mono); color: var(--ink-2); white-space: nowrap; }
.note { margin: 20px 0 0; font-size: 14px; color: var(--ink-2); }

/* 常见问题 */
.faq { max-width: 780px; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font: 18px/1.3 var(--mono); color: var(--ink-3); }
details[open] summary::after { content: "−"; }
details p { margin: -6px 0 24px; max-width: 40em; color: var(--ink-2); }

/* 黑底号召 */
.cta { padding: 88px 0; background: var(--ink); color: #fff; }
.cta .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 32px; }
.cta h2 { margin: 0; }
.cta p { margin: 12px 0 0; color: #b4b4ae; }
.cta .btn { background: #fff; color: var(--ink); border-color: #fff; }
.cta .btn:hover { background: #e9e9e5; }

/* 页脚 */
.site-footer { padding: 64px 0 40px; font-size: 14px; color: var(--ink-2); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid p { margin: 14px 0 0; max-width: 22em; }
.site-footer .brand { color: var(--ink); }
.footer-grid h4 {
  margin: 0 0 14px;
  font: 500 12px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.footer-grid ul { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.footer-grid a { text-decoration: none; }
.footer-grid a:hover { color: var(--ink); text-decoration: underline; }
.legal-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-3);
}

/* 文档和法律页 */
.page-head { padding: 72px 0 48px; border-bottom: 1px solid var(--line); }
.page-head h1 { margin: 14px 0 12px; font-size: clamp(36px, 4.6vw, 52px); }
.page-head p:not(.eyebrow):not(.meta) { margin: 0; max-width: 40em; font-size: 18px; color: var(--ink-2); }
.page-head .meta { margin-top: 16px; font: 13px/1.4 var(--mono); color: var(--ink-3); }

.doc-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 64px; align-items: start; }
.toc { position: sticky; top: 96px; padding-top: 52px; font-size: 14px; }
.toc h4 { margin: 0 0 12px; font: 500 12px/1.4 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.toc ul { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.toc a { color: var(--ink-2); text-decoration: none; }
.toc a:hover { color: var(--ink); }

.prose { max-width: 760px; padding: 40px 0 112px; }
.prose > :first-child { margin-top: 12px; }
.prose h2 { margin: 64px 0 16px; font-size: 28px; }
.prose h3 { margin: 36px 0 10px; font-size: 18px; font-weight: 600; letter-spacing: -0.01em; }
.prose p, .prose li { color: #2b2b28; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li + li { margin-top: 6px; }
.prose .code { margin: 20px 0; }
.prose table { min-width: 520px; font-size: 14.5px; }
.prose .table-wrap { margin: 20px 0; }
.prose td { padding: 14px 20px; }
.prose table.kv { min-width: 0; }
.prose table:not(.kv) code { white-space: nowrap; overflow-wrap: normal; }
.callout { margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--ink); background: var(--paper-2); }
.callout p { margin: 0; }

/* 404 */
.notfound { padding: 160px 0; text-align: center; }
.notfound svg { width: 56px; height: 56px; margin: 0 auto 32px; fill: currentColor; }
.notfound p:not(.eyebrow) { color: var(--ink-2); }

@media (max-width: 960px) {
  .doc-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .toc { display: none; }
}

@media (max-width: 860px) {
  .hero { padding: 64px 0; }
  .hero .wrap { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .section { padding: 72px 0; }
  .trio { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .wrap { padding-inline: 20px; }
  .site-header .wrap { gap: 16px; }
  .nav { gap: 18px; }
  .nav .wide { display: none; }
  .lede { font-size: 17px; }
  table.pricing { min-width: 0; }
  .pricing .col-dev { display: none; }
  .pricing th, .pricing td { padding: 14px 12px; }
  .actions .btn { flex: 1 1 auto; }
}