/* ============================================================
   GEO Optimizer 文档页设计系统 —— Engineering Field Manual
   浅色阅读模式：冷调纸白 + 墨蓝 + 信号绿，等宽编号注记，
   左侧目录滚动跟随，深色代码面板。全本地化，无外部依赖。
   ============================================================ */
:root {
  --paper: #f2f5f8;
  --card: #ffffff;
  --ink: #0f1d33;
  --body-c: #3d4c66;
  --muted: #7488a6;
  --faint: #9dafc8;
  --line: #dde5ee;
  --line-soft: #e8eef5;
  --accent: #0a8f66;
  --accent-strong: #067a55;
  --accent-soft: #e3f4ec;
  --accent-line: #bfe4d4;
  --navy: #0d1a2e;
  --navy-2: #0a1424;
  --code-txt: #c6d4ea;
  --amber: #a35d08;
  --amber-soft: #fdf1df;
  --amber-line: #f0d5ac;
  --red: #c03a3a;
  --red-soft: #fbeaea;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas,
    "Courier New", monospace;
  --shadow-card: 0 1px 2px rgba(15, 29, 51, 0.05), 0 8px 28px rgba(15, 29, 51, 0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--body-c);
  font-size: 15px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
::selection { background: rgba(10, 143, 102, 0.18); }

a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---- 阅读进度条 ---- */
.read-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #2ec98f);
  z-index: 100;
  transition: width .1s linear;
}

/* ---- 背景纹理 ---- */
.doc-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(820px 400px at 88% -6%, rgba(10, 143, 102, 0.055), transparent 60%),
    radial-gradient(700px 420px at -8% 22%, rgba(37, 99, 195, 0.05), transparent 60%),
    var(--paper);
}
.doc-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 29, 51, 0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 29, 51, 0.024) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(#000 0%, transparent 420px);
  -webkit-mask-image: linear-gradient(#000 0%, transparent 420px);
}

/* ---- 顶栏 ---- */
.doc-topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 58px;
  padding: 0 clamp(16px, 3.5vw, 40px);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.doc-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 15px;
  color: var(--ink);
  white-space: nowrap;
}
.doc-brand:hover { text-decoration: none; }
.doc-brand .glyph {
  width: 22px; height: 22px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  position: relative;
  flex: none;
}
.doc-brand .glyph::before {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--accent);
}
.doc-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}
.doc-crumb .sep { color: var(--faint); }
.doc-crumb b { color: var(--accent-strong); font-weight: 600; }
.doc-topbar .spacer { flex: 1; }
.doc-topbar .t-link {
  font-size: 13.5px;
  color: var(--body-c);
  padding: 6px 12px;
  border-radius: 7px;
  transition: background .2s, color .2s;
}
.doc-topbar .t-link:hover { background: var(--accent-soft); color: var(--accent-strong); text-decoration: none; }
.doc-topbar .t-btn {
  font-size: 13px;
  font-weight: 600;
  padding: 7px 18px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff !important;
  transition: background .2s, transform .2s;
}
.doc-topbar .t-btn:hover { background: var(--accent-strong); text-decoration: none; transform: translateY(-1px); }
.lang-mini { display: flex; gap: 2px; font-family: var(--font-mono); font-size: 12px; }
.lang-mini a {
  padding: 4px 8px;
  border-radius: 5px;
  color: var(--muted);
  border: 1px solid transparent;
}
.lang-mini a:hover { text-decoration: none; color: var(--ink); }
.lang-mini a.on { color: var(--accent-strong); border-color: var(--accent-line); background: var(--accent-soft); }

/* ---- 主体两栏 ---- */
.doc-shell {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(16px, 3.5vw, 40px);
}

/* ---- 左侧目录 ---- */
.doc-toc {
  position: sticky;
  top: 58px;
  align-self: start;
  height: calc(100vh - 58px);
  overflow-y: auto;
  padding: 34px 0 40px;
  scrollbar-width: thin;
}
.toc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--faint);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.toc-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.doc-toc ul { list-style: none; }
.doc-toc > ul > li { margin-bottom: 4px; }
.doc-toc a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 12px 7px 14px;
  border-left: 2px solid transparent;
  border-radius: 0 7px 7px 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
  transition: all .2s;
}
.doc-toc a:hover { color: var(--ink); background: rgba(15, 29, 51, 0.035); text-decoration: none; }
.doc-toc a .n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--faint);
  flex: none;
  transition: color .2s;
}
.doc-toc a.on {
  color: var(--accent-strong);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--accent-soft);
}
.doc-toc a.on .n { color: var(--accent); }
.doc-toc .sub a { padding-left: 34px; font-size: 12.5px; padding-top: 5px; padding-bottom: 5px; }
.toc-cta {
  margin-top: 26px;
  padding: 16px 15px;
  border: 1px dashed var(--accent-line);
  border-radius: 11px;
  background: rgba(227, 244, 236, 0.4);
}
.toc-cta p { font-size: 12.5px; color: var(--muted); line-height: 1.65; margin-bottom: 10px; }
.toc-cta a { font-size: 13px; font-weight: 700; }

/* ---- 文章主体 ---- */
.doc-main { padding: 44px 0 90px; min-width: 0; }

/* 页头 */
.doc-header { margin-bottom: 46px; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.doc-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.doc-kicker::before { content: ""; width: 30px; height: 2px; background: var(--accent); }
.doc-header h1 {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.doc-lede { font-size: 16px; color: var(--muted); max-width: 640px; }
.doc-meta {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--faint);
  letter-spacing: .05em;
}
.doc-meta b { color: var(--muted); font-weight: 600; }

/* 章节 */
.doc-sec { margin-bottom: 58px; scroll-margin-top: 84px; }
.sec-anchor { display: block; position: relative; }
.doc-sec > h2 {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-size: 24px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
  scroll-margin-top: 84px;
}
.doc-sec > h2 .no {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .06em;
}
.doc-sec h3 {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ink);
  margin: 32px 0 13px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  scroll-margin-top: 84px;
}
.doc-sec h3::before {
  content: "§";
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 14px;
}
.doc-sec h4 {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
  margin: 22px 0 10px;
}
.doc-sec p { margin-bottom: 13px; max-width: 760px; }
.doc-sec ul, .doc-sec ol { padding-left: 22px; margin-bottom: 14px; max-width: 760px; }
.doc-sec li { margin-bottom: 6px; }
.doc-sec li::marker { color: var(--accent); font-weight: 700; }
.doc-sec strong { color: var(--ink); }
.doc-sec hr { border: none; border-top: 1px dashed var(--line); margin: 34px 0; }

/* 行内代码 / kbd */
.doc-sec code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: rgba(15, 29, 51, 0.055);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1.5px 6px;
  color: #175a44;
  white-space: nowrap;
}

/* 表格 */
.tbl-wrap { overflow-x: auto; margin: 16px 0 20px; border-radius: 11px; border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow-card); }
.doc-sec table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.doc-sec th {
  text-align: left;
  padding: 11px 16px;
  background: #f6f9fb;
  color: var(--muted);
  font-size: 11.5px;
  font-family: var(--font-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.doc-sec td { padding: 11px 16px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.doc-sec tr:last-child td { border-bottom: none; }
.doc-sec tbody tr { transition: background .15s; }
.doc-sec tbody tr:hover { background: #f4faf7; }
.doc-sec td code { white-space: normal; }

/* HTTP 方法徽标 */
.mth {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .07em;
  padding: 2.5px 9px;
  border-radius: 5px;
}
.mth.get { background: #e7f0fd; color: #245bb3; }
.mth.post { background: var(--accent-soft); color: var(--accent-strong); }

/* 状态徽标 */
.st-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 99px;
}
.st-badge.ok { background: var(--accent-soft); color: var(--accent-strong); }
.st-badge.warn { background: var(--amber-soft); color: var(--amber); }
.st-badge.err { background: var(--red-soft); color: var(--red); }

/* ---- 代码面板 ---- */
.code-panel {
  margin: 16px 0 20px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--navy);
  border: 1px solid #1d3050;
  box-shadow: 0 10px 30px rgba(13, 26, 46, 0.18);
}
.code-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.035);
  border-bottom: 1px solid rgba(126, 168, 224, 0.14);
}
.code-head .dots { display: flex; gap: 5px; }
.code-head .dots i { width: 9px; height: 9px; border-radius: 50%; background: #2a3d5e; }
.code-head .lang-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #6b82a8;
  margin-left: 4px;
}
.code-head .fname {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: #8ca1c0;
}
.code-copy {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #8ca1c0;
  background: transparent;
  border: 1px solid rgba(126, 168, 224, 0.25);
  border-radius: 6px;
  padding: 3.5px 11px;
  cursor: pointer;
  transition: all .2s;
}
.code-copy:hover { color: #00e5a0; border-color: rgba(0, 229, 160, 0.5); background: rgba(0, 229, 160, 0.08); }
.code-copy.done { color: #00e5a0; border-color: rgba(0, 229, 160, 0.5); }
.code-panel pre {
  padding: 17px 19px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.8px;
  line-height: 1.9;
  color: var(--code-txt);
  scrollbar-width: thin;
}
.code-panel .c { color: #54688c; }
.code-panel .k { color: #7fd6b2; }
.code-panel .s { color: #ffce8a; }
.code-panel .n { color: #9ec1ff; }
.code-panel .p { color: #6b82a8; }

/* ---- 提示框 ---- */
.callout {
  display: flex;
  gap: 13px;
  padding: 15px 18px;
  border-radius: 10px;
  margin: 16px 0 20px;
  font-size: 13.8px;
  line-height: 1.75;
  border: 1px solid;
}
.callout .ico { flex: none; font-family: var(--font-mono); font-weight: 800; font-size: 13px; width: 24px; height: 24px; border-radius: 7px; display: flex; align-items: center; justify-content: center; }
.callout.tip { background: var(--accent-soft); border-color: var(--accent-line); color: #14563f; }
.callout.tip .ico { background: var(--accent); color: #fff; }
.callout.warn { background: var(--amber-soft); border-color: var(--amber-line); color: #6e4109; }
.callout.warn .ico { background: var(--amber); color: #fff; }
.callout.info { background: #e9f1fc; border-color: #c6dbf5; color: #1d4a86; }
.callout.info .ico { background: #2f6fca; color: #fff; }

/* ---- 步骤卡片 ---- */
.steps { display: grid; gap: 0; margin: 18px 0 22px; counter-reset: stp; }
.step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 18px;
  position: relative;
  padding-bottom: 24px;
  counter-increment: stp;
}
.step:last-child { padding-bottom: 0; }
.step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 46px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--accent-line), var(--line-soft));
}
.step:last-child::before { display: none; }
.step .no {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--card);
  border: 1.5px solid var(--accent-line);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-card);
  transition: all .25s;
}
.step:hover .no { background: var(--accent); border-color: var(--accent); color: #fff; transform: scale(1.06); }
.step h4 { font-size: 15.5px; font-weight: 700; color: var(--ink); margin: 10px 0 5px; }
.step p { font-size: 13.8px; color: var(--muted); margin: 0; }

/* ---- 能力卡片网格（平台简介） ---- */
.cap-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 18px 0 22px; }
.cap {
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--card);
  padding: 16px 18px;
  transition: all .25s;
  box-shadow: var(--shadow-card);
}
.cap:hover { border-color: var(--accent-line); transform: translateY(-3px); box-shadow: 0 12px 30px rgba(10, 143, 102, 0.1); }
.cap b { display: block; font-size: 14px; color: var(--ink); margin-bottom: 4px; }
.cap b i { font-style: normal; margin-right: 7px; }
.cap span { font-size: 12.8px; color: var(--muted); line-height: 1.65; }

/* ---- FAQ 手风琴 ---- */
.faq { margin: 16px 0; border: 1px solid var(--line); border-radius: 11px; background: var(--card); overflow: hidden; transition: border-color .25s, box-shadow .25s; }
.faq + .faq { margin-top: 10px; }
.faq[open] { border-color: var(--accent-line); box-shadow: 0 8px 24px rgba(10, 143, 102, 0.08); }
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 15px 19px;
  font-weight: 700;
  font-size: 14.5px;
  color: var(--ink);
  transition: color .2s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent-strong); }
.faq summary::before {
  content: "Q";
  flex: none;
  width: 26px; height: 26px;
  border-radius: 7px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.faq summary::after {
  content: "+";
  margin-left: auto;
  font-size: 19px;
  font-weight: 400;
  color: var(--faint);
  transition: transform .3s, color .3s;
}
.faq[open] summary::after { transform: rotate(45deg); color: var(--accent); }
.faq .ans { padding: 0 19px 17px 58px; font-size: 13.8px; color: var(--muted); animation: ans-pop .3s ease; }
@keyframes ans-pop { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: none; } }

/* ---- 端点行（API 文档） ---- */
.ep-list { display: grid; gap: 9px; margin: 16px 0 22px; }
.ep-row {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  padding: 11px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--body-c);
  transition: all .2s;
  box-shadow: var(--shadow-card);
}
.ep-row:hover { border-color: var(--accent-line); transform: translateX(5px); }
.ep-row .path { color: var(--ink); font-weight: 600; }
.ep-row .desc { margin-left: auto; font-family: var(--font-body); font-size: 12.5px; color: var(--muted); }

/* ---- 状态流转图 ---- */
.flow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 16px 0 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.flow .node {
  padding: 6px 15px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--body-c);
  font-weight: 600;
  transition: all .2s;
}
.flow .node:hover { border-color: var(--accent-line); color: var(--accent-strong); transform: translateY(-2px); }
.flow .node.end-ok { border-color: var(--accent-line); background: var(--accent-soft); color: var(--accent-strong); }
.flow .node.end-bad { border-color: #ecc8c8; background: var(--red-soft); color: var(--red); }
.flow .arr { color: var(--faint); }

/* ---- 滚动浮现 ---- */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.rv.in { opacity: 1; transform: none; }

/* ---- 页脚 ---- */
.doc-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 30px clamp(16px, 3.5vw, 40px);
  margin-top: 20px;
}
.doc-footer .inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--faint);
  letter-spacing: .04em;
}
.doc-footer a { color: var(--muted); }

/* ---- 响应式 ---- */
@media (max-width: 920px) {
  .doc-shell { grid-template-columns: 1fr; }
  .doc-toc {
    position: static;
    height: auto;
    padding: 22px 0 0;
    overflow: visible;
  }
  .doc-toc ul { display: flex; flex-wrap: wrap; gap: 7px; }
  .doc-toc > ul > li { margin: 0; }
  .doc-toc a { border-left: none; border: 1px solid var(--line); border-radius: 99px; padding: 6px 14px; background: var(--card); }
  .doc-toc a.on { border-color: var(--accent-line); }
  .doc-toc .sub { display: none; }
  .toc-cta { display: none; }
  .cap-grid { grid-template-columns: 1fr; }
  .ep-row .desc { display: none; }
  .doc-crumb { display: none; }
}