:root {
  color-scheme: light;
  --sans: Inter, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --bg: #f6f8fc;
  --panel: #ffffff;
  --ink: #101b2d;
  --muted: #5c6a86;
  --line: #e3e8f1;
  --blue: #315efb;
  --blue-dark: #244de0;
  --green: #14865d;
  --dark: #0b1220;
  --dark-2: #101c33;
  --dark-line: #1f2d48;
  --dark-text: #e7eefb;
  --dark-muted: #9aa9c6;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 15px; line-height: 1.6; font-synthesis: none;
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

a { color: inherit; }
p { margin: 0 0 14px; }
h1, h2, h3 { margin: 0; line-height: 1.22; letter-spacing: -.6px; font-weight: 760; }
h1 { font-size: clamp(34px, 5.1vw, 58px); }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: 17px; letter-spacing: -.2px; }
code, pre { font-family: var(--mono); }
:focus-visible { outline: 3px solid #315efb80; outline-offset: 2px; }

.shell { width: min(1180px, 100% - 44px); margin-inline: auto; }
.shell.narrow { width: min(880px, 100% - 44px); }
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 30; padding: 10px 14px;
  border-radius: 8px; background: var(--blue); color: #fff; font-weight: 650; transition: top .15s;
}
.skip-link:focus { top: 12px; }

/* ---------- 按钮 ---------- */
.btn-solid, .btn-outline, .btn-ghost, .btn-light {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 10px; padding: 9px 15px; font-size: 14px; font-weight: 660;
  text-decoration: none; white-space: nowrap; cursor: pointer; font-family: inherit;
  border: 1px solid transparent; transition: background-color .15s, border-color .15s, color .15s;
}
.btn-solid { background: var(--blue); border-color: #244de0; color: #fff; box-shadow: 0 6px 18px #315efb30; }
.btn-solid:hover { background: var(--blue-dark); }
.btn-outline { background: #fff; border-color: #d5dcea; color: #22304c; }
.btn-outline:hover { border-color: var(--blue); color: var(--blue-dark); background: #f5f8ff; }
.btn-light { background: #fff; border-color: #fff; color: #0d1729; }
.btn-light:hover { background: #e6ecfb; }
.btn-ghost { background: transparent; border-color: #2c3c5d; color: #cdd9f0; }
.btn-ghost:hover { border-color: #47608f; background: #16233b; color: #fff; }
.lg { padding: 13px 22px; font-size: 15px; border-radius: 12px; }
.block { width: 100%; margin-top: 6px; }

/* ---------- 顶部导航（深色，与 hero 连成一片） ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 20; color: var(--dark-text);
  background: #0b1220ee; -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-line);
}
.nav-inner { display: flex; align-items: center; gap: 18px; min-height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-mark {
  display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px;
  background: var(--blue); color: #fff; font-weight: 800; font-size: 16px;
}
.logo-word { display: inline-flex; align-items: baseline; gap: 7px; font-weight: 800; letter-spacing: 1.4px; font-size: 14px; }
.logo-word em { font-style: normal; font-weight: 600; letter-spacing: .4px; font-size: 11px; color: var(--dark-muted); }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: 12px; }
.nav-links a {
  padding: 8px 11px; border-radius: 8px; color: #bdcbe6; font-size: 14px; font-weight: 600; text-decoration: none;
}
.nav-links a:hover { color: #fff; background: #18263f; }
.nav-links a.active { color: #fff; background: #1c2b47; }
.nav-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.nav-burger {
  display: none; align-items: center; justify-content: center; width: 40px; height: 36px;
  border: 1px solid #2c3c5d; border-radius: 9px; background: transparent; color: #dbe6fb; font-size: 17px;
}

/* ---------- Hero（铺满首屏，内容垂直居中，深色区正好在第一屏结束） ---------- */
.hero {
  position: relative; overflow: hidden; color: var(--dark-text);
  display: flex; align-items: center;
  /* 64px = 顶部导航高度；dvh 优先，不支持时回退 vh */
  min-height: calc(100vh - 64px); min-height: calc(100dvh - 64px);
  padding: clamp(28px, 4vw, 56px) 0;
  background: linear-gradient(180deg, #0b1220 0%, #101c33 55%, #0c1626 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: linear-gradient(#ffffff09 1px, transparent 1px), linear-gradient(90deg, #ffffff09 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(120% 80% at 20% 0%, #000 35%, transparent 78%);
  mask-image: radial-gradient(120% 80% at 20% 0%, #000 35%, transparent 78%);
}
.hero-grid {
  position: relative; display: grid; gap: clamp(28px, 4vw, 56px); align-items: center;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px; margin: 0 0 18px; color: #7ea2ff;
  font-family: var(--mono); font-size: 11.5px; font-weight: 700; letter-spacing: 1.6px; text-transform: uppercase;
}
.eyebrow.center { display: block; text-align: center; justify-content: center; color: var(--blue); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #38d39f; box-shadow: 0 0 0 4px #38d39f26; }
.dot.wait { background: #f5b544; box-shadow: 0 0 0 4px #f5b54426; }
.dot.bad { background: #ff6b7a; box-shadow: 0 0 0 4px #ff6b7a26; }
.hero h1 { color: #f2f6ff; }
.accent { color: #9fbaff; }
.lede { max-width: 62ch; margin-bottom: 26px; color: #c3d0e8; font-size: clamp(15px, 1.4vw, 17px); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; padding: 0; list-style: none; }
.chips li {
  padding: 6px 11px; border: 1px solid #263a5c; border-radius: 999px; color: #a9bde0;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .3px; background: #ffffff08;
}

/* ---------- 终端卡片 ---------- */
.terminal {
  border: 1px solid #223550; border-radius: 16px; background: #09101f;
  box-shadow: 0 30px 70px #01060f80; overflow: hidden;
}
.term-top { display: flex; align-items: center; gap: 12px; padding: 11px 15px; border-bottom: 1px solid #1a2740; background: #0c1424; }
.term-dots { display: inline-flex; gap: 6px; }
.term-dots i { width: 10px; height: 10px; border-radius: 50%; background: #2a3a58; }
.term-dots i:nth-child(1) { background: #ff5f57; }
.term-dots i:nth-child(2) { background: #febc2e; }
.term-dots i:nth-child(3) { background: #28c840; }
.term-name { font-family: var(--mono); font-size: 11.5px; letter-spacing: .8px; text-transform: uppercase; color: #8fa4c8; }
.terminal pre { margin: 0; padding: 18px; overflow-x: auto; font-size: 12.8px; line-height: 1.75; color: #cddcf7; }
.terminal .ok { color: #5dd39a; }
.term-foot {
  display: flex; align-items: flex-start; gap: 8px; margin: 0; padding: 13px 16px;
  border-top: 1px solid #1a2740; background: #0b1322; font-size: 12.8px; color: #9db0d0;
}
.term-foot .tick { color: #5dd39a; font-weight: 800; }

/* 代码块内部的 <code> 永远继承 pre 的深底浅字。绝不能用 `.step code` 这类后代选择器
   给它加浅色背景，否则会给每行文字片段画出白条，看起来像整块被选中。 */
.step pre code, .terminal pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }

/* ---------- 通用分区 ---------- */
.band { padding: clamp(56px, 8vw, 104px) 0; scroll-margin-top: 76px; }
.band.alt { background: #eef2f9; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.band > .shell > h2, .band > .shell.narrow > h2 { text-align: center; }
.sub { max-width: 76ch; margin: 14px auto 44px; text-align: center; color: var(--muted); font-size: 15.5px; }
.footnote { margin-top: 34px; color: var(--muted); font-size: 13px; text-align: center; }
.footnote.mono { font-family: var(--mono); font-size: 12.2px; letter-spacing: .2px; }

/* ---------- 工作原理三步 ---------- */
.steps { display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.step {
  position: relative; padding: 26px 24px 22px; border: 1px solid var(--line); border-radius: 18px;
  background: var(--panel); box-shadow: 0 12px 40px #1c2a4610;
}
.step-num {
  position: absolute; top: 14px; right: 18px; margin: 0; color: #c9d4ea;
  font-family: var(--mono); font-size: 34px; font-weight: 700; letter-spacing: 1px;
}
.step h3 { margin-bottom: 10px; max-width: 84%; font-size: 18px; }
.step p { color: var(--muted); font-size: 14px; }
/* 行内代码：用 :not(pre) > code 精确排除代码块内部的 <code> */
.step :not(pre) > code, .card :not(pre) > code, .faq-list :not(pre) > code {
  padding: .1em .4em; border: 1px solid #e0e7f3; border-radius: 5px;
  background: #f7f9fd; color: #26395f; font-size: .88em;
}
.step pre {
  margin: 16px -6px 0; padding: 15px 16px; overflow-x: auto; border-radius: 12px;
  background: #0b1220; color: #cddcf7; font-size: 12.2px; line-height: 1.72;
}

/* ---------- SDK 能力卡片 ---------- */
.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card {
  padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel);
  box-shadow: 0 10px 30px #1c2a460c;
}
.card h3 { margin-bottom: 9px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.scope {
  display: grid; gap: 14px; margin-top: 26px; padding: 24px; border: 1px dashed #c4d0e6;
  border-radius: 16px; background: #fbfcff;
}
.scope h3 { color: #23324e; }
.scope ul { margin: 0; padding-left: 20px; color: var(--muted); font-size: 14px; }
.scope li { margin-bottom: 6px; }
.scope a { justify-self: start; }

/* ---------- API 表 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); box-shadow: 0 12px 40px #1c2a4610; }
.api-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 14px; }
.api-table th, .api-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.api-table thead th {
  background: #f2f5fb; color: #43526f; font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 1.1px; text-transform: uppercase; font-weight: 700;
}
.api-table tbody tr:last-child td { border-bottom: 0; }
.api-table tbody tr:hover { background: #f7f9fe; }
.api-table code { font-size: 12.6px; color: #1d2f57; }
.api-table td:nth-child(4) { color: var(--muted); font-size: 13px; white-space: nowrap; }
.verb {
  display: inline-block; padding: 2px 8px; border-radius: 6px; font-family: var(--mono);
  font-size: 11.5px; font-weight: 700; letter-spacing: .6px;
}
.verb.get { background: #e4f6ee; color: #0f6d4b; }
.verb.post { background: #e8eeff; color: #2445c9; }

/* ---------- 价格 ---------- */
.plans { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); align-items: start; }
.plan {
  position: relative; padding: 26px 24px; border: 1px solid var(--line); border-radius: 18px;
  background: var(--panel); box-shadow: 0 12px 40px #1c2a4610;
}
.plan.featured { border-color: #b9c8ff; box-shadow: 0 20px 54px #315efb22; }
.plan-badge {
  position: absolute; top: -12px; left: 24px; margin: 0; padding: 3px 10px; border-radius: 999px;
  background: var(--blue); color: #fff; font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1px;
}
.plan-name { margin: 0 0 6px; color: #3b4a68; font-family: var(--mono); font-size: 12px; font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase; }
.plan-price { margin: 0 0 18px; color: var(--ink); font-size: 40px; font-weight: 780; letter-spacing: -1.4px; }
.plan-price.small { font-size: 24px; letter-spacing: -.6px; }
.plan-price .cur { font-size: 20px; font-weight: 700; vertical-align: 8px; margin-right: 2px; }
.plan-price .per { font-size: 13.5px; font-weight: 600; color: var(--muted); letter-spacing: 0; margin-left: 6px; }
.plan-list { margin: 0 0 20px; padding: 0; list-style: none; color: var(--muted); font-size: 14px; }
.plan-list li { position: relative; padding: 7px 0 7px 24px; border-top: 1px solid #eef1f7; }
.plan-list li::before { content: "✓"; position: absolute; left: 2px; top: 7px; color: var(--green); font-weight: 800; }

/* ---------- 常见问题 ---------- */
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary {
  display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 4px;
  cursor: pointer; font-size: 16px; font-weight: 680; color: #1d2a44; list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; flex: 0 0 auto; width: 26px; height: 26px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--blue); font-size: 17px; font-weight: 700;
}
.faq-list details[open] summary::after { content: "−"; background: #eef2f9; }
.faq-list details p { max-width: 78ch; margin: 0 0 20px; padding-right: 40px; color: var(--muted); font-size: 14.5px; }

/* ---------- 结尾 CTA ---------- */
.cta-band { padding: clamp(52px, 7vw, 86px) 0; background: linear-gradient(120deg, #0b1220, #17263f 60%, #123); color: var(--dark-text); }
.cta-inner { display: grid; gap: 12px; justify-items: center; text-align: center; }
.cta-inner p { max-width: 68ch; margin: 0 0 14px; color: #bccbe6; }

/* ---------- 页脚 ---------- */
.site-footer { padding: 60px 0 26px; background: var(--dark); color: var(--dark-muted); font-size: 14px; }
.footer-grid { display: grid; gap: 34px; grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); padding-bottom: 34px; border-bottom: 1px solid var(--dark-line); }
.footer-logo { margin-bottom: 14px; color: var(--dark-text); }
.footer-brand p { max-width: 44ch; }
.status { display: inline-flex; align-items: center; gap: 9px; margin: 4px 0 0; font-family: var(--mono); font-size: 12.5px; }
/* 状态行依赖脚本查询 /api/health，没有 JS 时不显示，避免停在一句假的“正在检查”。 */
html:not(.js) .status { display: none; }
.footer-col { display: grid; gap: 9px; align-content: start; }
.footer-col h3 { margin-bottom: 6px; color: #dce6f8; font-family: var(--mono); font-size: 11.5px; font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase; }
.footer-col a { color: var(--dark-muted); text-decoration: none; }
.footer-col a:hover { color: #fff; text-decoration: underline; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding-top: 20px; font-size: 13px; }
.footer-bottom p { margin: 0; }

/* ---------- 响应式与无 JS 降级 ---------- */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  html.js .nav-burger { display: inline-flex; }
  html.js .nav-links {
    position: absolute; left: 0; right: 0; top: 64px; display: none; flex-direction: column;
    align-items: stretch; gap: 2px; margin: 0; padding: 10px 16px 16px;
    border-bottom: 1px solid var(--dark-line); background: #0b1220f7;
  }
  html.js .site-nav.open .nav-links { display: flex; }
  html.js .nav-links a { padding: 12px 11px; font-size: 15px; }
}
@media (max-width: 640px) {
  .hero { min-height: auto; }
  .shell, .shell.narrow { width: min(1180px, 100% - 30px); }
  .hide-sm { display: none; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .faq-list details p { padding-right: 0; }
  .step-num { font-size: 26px; }
  .step h3 { max-width: 88%; }
}