/* ============================================================
   Doc2Markdown API — 商业官网样式
   design-system: stripe（tokens 依据 stripe/DESIGN.md）
   布局骨架: saas-landing 六段式 + 痛点/数据/对比扩展段
   ============================================================ */

:root {
  /* stripe tokens */
  --bg: #ffffff;
  --surface: #f6f9fc;
  --ink: #061b31;          /* deep navy 标题色 */
  --ink-soft: #273951;     /* label 深板岩 */
  --body-c: #64748d;       /* slate 正文 */
  --border: #e5edf5;
  --accent: #533afd;       /* stripe purple */
  --accent-dark: #4434d4;
  --accent-soft: rgba(83, 58, 253, 0.06);
  --ok: #108c3d;
  --ok-bg: rgba(21, 190, 83, 0.14);
  --err: #df1b41;
  --err-bg: rgba(223, 27, 65, 0.1);

  --shadow-blue: 0 30px 45px -30px rgba(50, 50, 93, 0.25), 0 18px 36px -18px rgba(0, 0, 0, 0.1);
  --shadow-ambient: 0 15px 35px rgba(23, 23, 23, 0.08);
  --font-sans: "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Source Code Pro", ui-monospace, SFMono-Regular, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
b { color: var(--ink); }

section { padding: 84px 0; }
section.soft { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

/* ---------- 文字层级 ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 14px;
}
.sec-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.sec-head h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
}
.sec-head p { color: var(--body-c); font-size: 16px; max-width: 52ch; margin: 0 auto; }

/* ---------- 导航 ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; color: var(--ink); letter-spacing: -0.01em; }
.logo {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-size: 15px;
}
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; color: var(--ink-soft); }
.nav-links a { transition: color 120ms ease; }
.nav-links a:hover { color: var(--ink); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-sans); font-weight: 500; font-size: 15px;
  border: 0; cursor: pointer; border-radius: 6px;
  padding: 10px 20px; letter-spacing: 0.02em;
  transition: background 120ms ease, opacity 120ms ease, transform 120ms ease;
}
.btn-pri { background: var(--accent); color: #fff; }
.btn-pri:hover { background: var(--accent-dark); }
.btn-pri:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--border); }
.btn-ghost:hover { background: #fff; border-color: #c9d6e6; box-shadow: 0 2px 6px rgba(23,23,23,0.05); }
.btn-invert { background: #fff; color: var(--accent); }
.btn-invert:hover { opacity: 0.92; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 84px; text-align: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--border); background: #fff;
  padding: 6px 14px; border-radius: 999px; font-size: 13px; color: var(--ink-soft);
  margin-bottom: 26px;
}
.badge b { color: var(--accent); }
.badge-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); display: inline-block; }
.hero h1 {
  font-size: clamp(34px, 5.6vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 700;
  color: var(--ink);
  margin: 0 auto 22px;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.hero p.sub { max-width: 640px; margin: 0 auto; color: var(--body-c); font-size: 18px; line-height: 1.6; }
.hero-cta { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.mini { margin-top: 16px; font-size: 13px; color: var(--body-c); }

/* Hero 多语言示例块 */
.hero-ex { max-width: 80%; margin: 48px auto 0; text-align: left; }

/* ---------- 痛点段 ---------- */
.pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px 56px; max-width: 980px; margin: 0 auto; }
.pain .num { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--accent); display: block; margin-bottom: 10px; }
.pain h3 { font-size: 19px; color: var(--ink); font-weight: 700; letter-spacing: -0.01em; margin-bottom: 10px; }
.pain p { color: var(--body-c); font-size: 15px; line-height: 1.65; }
.pain .fix {
  display: flex; gap: 10px; align-items: flex-start;
  margin-top: 14px; padding: 12px 14px;
  background: var(--accent-soft); border-radius: 8px; font-size: 14px; color: var(--ink-soft);
}
.pain .fix svg { width: 16px; height: 16px; color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.pain .fix b { color: var(--accent); }

/* ---------- 特性段（非对称网格） ---------- */
.feature-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px 56px; max-width: 980px; margin: 0 auto; }
.feature .num { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--accent); display: block; margin-bottom: 10px; }
.feature h3 { font-size: 21px; color: var(--ink); font-weight: 700; letter-spacing: -0.01em; margin-bottom: 10px; }
.feature p { color: var(--body-c); font-size: 15px; line-height: 1.65; max-width: 46ch; }
.feature p b { color: var(--ink); }
.feature p code { font-family: var(--font-mono); font-size: 13px; background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; color: var(--ink); }
.feature.span-2 { grid-column: span 2; }
.feature .num::after { content: ""; }

/* ---------- 实测数据段 ---------- */
.bench {
  max-width: 820px; margin: 0 auto;
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 28px 28px 22px; box-shadow: var(--shadow-ambient);
}
.bench-head { display: grid; grid-template-columns: 110px 1fr 1fr; gap: 18px; font-size: 12.5px; color: var(--body-c); margin-bottom: 18px; }
.bench-tag { display: inline-block; font-size: 10.5px; border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; margin-left: 4px; color: var(--body-c); background: var(--surface); }
.bench-tag.dark { background: var(--ink); color: #fff; border-color: var(--ink); }
.bench-row { display: grid; grid-template-columns: 110px 1fr 1fr; gap: 18px; align-items: center; padding: 12px 0; border-top: 1px solid var(--border); }
.bench-label { font-size: 14px; color: var(--ink); font-weight: 500; }
.bench-cell { display: flex; align-items: center; gap: 12px; }
.bar { height: 12px; border-radius: 3px; width: var(--w); min-width: 4px; }
.bar.old { background: #c9d6e6; }
.bar.new { background: var(--accent); }
.bar-val { font-family: var(--font-mono); font-size: 13px; color: var(--body-c); width: 60px;}
.bar-val.strong { color: var(--ink); font-weight: 600; }
.bench-note { margin-top: 16px; font-size: 12.5px; color: var(--body-c); border-top: 1px solid var(--border); padding-top: 12px; }

/* ---------- 对比表 ---------- */
.table-scroll { overflow-x: auto; }
.cmp-table { width: 100%; max-width: 980px; margin: 0 auto; border-collapse: separate; border-spacing: 0; background: #fff; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; box-shadow: var(--shadow-ambient); }
.cmp-table th, .cmp-table td { padding: 15px 20px; text-align: left; font-size: 14.5px; border-top: 1px solid var(--border); }
.cmp-table thead th { border-top: 0; background: var(--surface); font-size: 13px; color: var(--ink); font-weight: 700; letter-spacing: 0.02em; }
.cmp-table tbody td:first-child { color: var(--ink); font-weight: 500; width: 15%; }
.cmp-table td.hl { background: var(--accent-soft); color: var(--ink); font-weight: 500; }
.cmp-table thead th.hl { background: var(--accent); color: #fff; }
.cmp-table td:not(.hl) { color: var(--body-c); }

/* ---------- 格式 chips + 视觉识别 ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 860px; margin: 0 auto; }
.chip { border: 1px solid var(--border); background: #fff; border-radius: 6px; padding: 9px 16px; font-size: 14px; color: var(--ink-soft); }
.chip b { color: var(--ink); font-family: var(--font-mono); font-weight: 600; font-size: 13px; }
.vision { margin-top: 72px; }
.vision-head { text-align: center; margin-bottom: 32px; }
.vision-head h3 { font-size: 22px; color: var(--ink); letter-spacing: -0.01em; }
.vision-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.vision-card { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 20px; box-shadow: 0 2px 6px rgba(23,23,23,0.04); }
.vision-card h4 { font-size: 15px; color: var(--ink); margin-bottom: 8px; }
.vision-card p { font-size: 13.5px; color: var(--body-c); line-height: 1.6; }

/* ---------- 三步上手 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 860px; margin: 0 auto; }
.step { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 26px; position: relative; }
.step-n { font-size: 15px; font-weight: 600; color: var(--accent); font-style: normal; font-family: var(--font-mono); }
.step h3 { font-size: 17px; color: var(--ink); margin: 10px 0 8px; }
.step p { font-size: 14px; color: var(--body-c); }

/* ---------- 接入示例（Hero 内） ---------- */
.ex-tabs {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 0 0 16px;
}
.ex-tabs span {
  padding: 8px 18px; border-radius: 6px; cursor: pointer; font-size: 14px;
  color: var(--ink-soft); border: 1px solid var(--border); background: #fff;
  transition: all 120ms ease; font-family: var(--font-mono);
}
.ex-tabs span:hover { border-color: #c9d6e6; color: var(--ink); }
.ex-tabs span.on { background: var(--ink); color: #fff; border-color: var(--ink); font-weight: 500; }
.ex-code {
  background: #0d253d;
  border-radius: 10px; box-shadow: var(--shadow-blue); overflow: hidden;
}
.ex-code-head { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.ex-dot { width: 10px; height: 10px; border-radius: 50%; }
.ex-file { margin-left: 8px; font-family: var(--font-mono); font-size: 12px; color: #7d93ac; }
.ex-copy {
  margin-left: auto; background: rgba(255,255,255,0.08); color: #dbe7f5;
  border: 1px solid rgba(255,255,255,0.15); border-radius: 6px;
  padding: 4px 14px; font-size: 12.5px; cursor: pointer; transition: all 120ms ease;
}
.ex-copy:hover { background: rgba(255,255,255,0.16); }
.ex-pre {
  margin: 0; padding: 20px 22px; overflow: auto; max-height: 480px;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.7; color: #dbe7f5;
}
.ex-note { margin: 14px 0 0; font-size: 13px; color: var(--body-c); }
.ex-note code { font-family: var(--font-mono); font-size: 12px; background: #fff; border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; color: var(--ink); }

/* ---------- 定价 ---------- */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; max-width: 1080px; margin: 0 auto; }
.plan {
  position: relative; background: #fff; border: 1px solid var(--border);
  border-radius: 10px; padding: 26px 22px; text-align: center;
  display: flex; flex-direction: column; box-shadow: 0 2px 6px rgba(23,23,23,0.04);
}
.plan.featured { border: 2px solid var(--accent); box-shadow: var(--shadow-blue); }
.plan .flag {
  display: inline-block; align-self: center; font-size: 11px; border-radius: 999px;
  padding: 3px 10px; margin-bottom: 14px; letter-spacing: 0.04em;
  background: var(--surface); border: 1px solid var(--border); color: var(--body-c);
}
.plan .flag-hot { background: var(--accent); color: #fff; border-color: var(--accent); }
.plan .pts { font-size: 24px; font-weight: 700; color: var(--ink); letter-spacing: -0.01em; }
.plan .pts small { font-size: 13px; color: var(--body-c); font-weight: 400; }
.plan .price { font-size: 30px; font-weight: 700; color: var(--ink); margin-top: 4px; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.plan .unit { font-size: 12.5px; color: var(--accent); margin: 6px 0 4px; font-weight: 500; }
.plan .note { color: var(--body-c); font-size: 13px; margin: 8px 0 18px; flex: 1; }
.plan .btn { width: 100%; }
.pricing-foot { text-align: center; margin-top: 28px; font-size: 13px; color: var(--body-c); max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; display: grid; gap: 12px; }
details { border: 1px solid var(--border); border-radius: 8px; background: #fff; padding: 16px 20px; }
details[open] { box-shadow: 0 2px 8px rgba(23,23,23,0.05); }
summary { cursor: pointer; font-weight: 500; font-size: 15px; color: var(--ink); }
summary::marker { color: var(--accent); }
details p { margin-top: 10px; color: var(--body-c); font-size: 14px; line-height: 1.7; }

/* ---------- 底部 CTA ---------- */
.closing { background: var(--accent); color: #fff; text-align: center; padding: 100px 0; }
.closing h2 {
  font-size: clamp(28px, 4.2vw, 44px); line-height: 1.15; letter-spacing: -0.02em;
  font-weight: 700; margin-bottom: 16px; color: #fff;
}
.closing p { opacity: 0.88; max-width: 46ch; margin: 0 auto 32px; font-size: 16px; }

/* ---------- 页脚 ---------- */
footer { padding: 34px 0; border-top: 1px solid var(--border); background: #fff; }
.foot-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.foot-brand { color: var(--body-c); font-size: 13px; }
footer .links { display: flex; gap: 24px; }
footer .links a { color: var(--body-c); font-size: 13px; transition: color 120ms ease; }
footer .links a:hover { color: var(--ink); }

/* ---------- 注册弹窗 ---------- */
.mask { position: fixed; inset: 0; background: rgba(6, 27, 49, 0.5); backdrop-filter: blur(4px); display: none; align-items: center; justify-content: center; z-index: 99; padding: 20px; }
.mask.open { display: flex; }
.modal { width: 100%; max-width: 400px; background: #fff; border-radius: 12px; padding: 26px; box-shadow: var(--shadow-blue); }
.modal h3 { font-size: 19px; color: var(--ink); margin-bottom: 14px; letter-spacing: -0.01em; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--ink-soft); margin-bottom: 6px; }
.row { display: flex; gap: 10px; }
.inp {
  flex: 1; background: #fff; border: 1px solid var(--border); border-radius: 6px; color: var(--ink);
  padding: 11px 13px; font-size: 15px; outline: none; transition: border-color 120ms ease; width: 100%;
}
.inp:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(83, 58, 253, 0.12); }
.inp::placeholder { color: #9aabc0; }
.btn-code { white-space: nowrap; background: #fff; border: 1px solid var(--border); color: var(--accent); border-radius: 6px; padding: 0 14px; cursor: pointer; font-size: 13.5px; }
.btn-code:disabled { color: #9aabc0; cursor: not-allowed; }
.msg { font-size: 13px; border-radius: 6px; padding: 10px 12px; display: none; margin-bottom: 12px; }
.msg.show { display: block; }
.msg.err { background: var(--err-bg); border: 1px solid rgba(223, 27, 65, 0.35); color: var(--err); }
.msg.ok { background: var(--ok-bg); border: 1px solid rgba(21, 190, 83, 0.4); color: var(--ok); }
.modal .btn { width: 100%; margin-top: 4px; }
.close { float: right; background: none; border: 0; color: var(--body-c); font-size: 22px; cursor: pointer; line-height: 1; }
.small { font-size: 12px; color: var(--body-c); margin-top: 12px; text-align: center; }
.auth-tabs { display: flex; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 4px; margin-bottom: 14px; }
.auth-tabs span { flex: 1; text-align: center; padding: 8px 0; cursor: pointer; color: var(--body-c); border-radius: 6px; font-size: 14px; }
.auth-tabs span.on { background: var(--accent); color: #fff; font-weight: 500; }
#toast { position: fixed; left: 50%; bottom: 36px; transform: translateX(-50%) translateY(8px); background: var(--ink); color: #fff; padding: 10px 20px; border-radius: 8px; font-size: 14px; opacity: 0; pointer-events: none; transition: 0.2s; z-index: 120; box-shadow: var(--shadow-blue); }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 响应式 ---------- */
.m-only { display: none; }
@media (max-width: 960px) {
  .plans { grid-template-columns: repeat(2, 1fr); }
  .vision-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 780px) {
  section { padding: 60px 0; }
  .nav-links { display: none; }
  .hero { padding: 64px 0 56px; }
  .pain-grid, .feature-grid { grid-template-columns: 1fr; }
  .feature.span-2 { grid-column: span 1; }
  .bench-head { grid-template-columns: 84px 1fr 1fr; }
  .bench-row { grid-template-columns: 84px 1fr 1fr; }
  .m-only { display: inline; }
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .plans { grid-template-columns: 1fr; }
  .vision-grid { grid-template-columns: 1fr; }
  .bench-head { grid-template-columns: 70px 1fr 1fr; }
  .bench-row { grid-template-columns: 70px 1fr 1fr; }
  .bench-label { font-size: 12.5px; }
}