/*! MOV 开发者中心首页 · Graphite Minimal（UPG-195）
 * token 源 = 设计师/设计/开发者中心-stitch/DESIGN.md（colors/typography/rounded/spacing·与官网同族）
 * 零外链：无 CDN、无字体外链（系统字体栈回退）、图标=内联 SVG
 */
:root {
  --surface: #f9f9f9;
  --surface-bright: #ffffff;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f3f3f3;
  --surface-container: #eeeeee;
  --surface-container-high: #e8e8e8;
  --surface-container-highest: #e2e2e2;
  --on-surface: #1a1c1c;
  --on-surface-variant: #444748;
  --outline: #747878;
  --ink-muted: #6a6d6d;   /* UPG-192：小字浅灰须过 WCAG AA（axe 0 违例）——#747878 对比 4.47/4.24 不达标 */
  --outline-variant: #c4c7c7;
  --primary: #000000;
  --on-primary: #ffffff;
  --primary-container: #1a1c1c;
  --success: #0a7d33;
  --gutter: 24px;
  --maxw: 1080px;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-full: 999px;
  --font-head: "Space Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: "Plus Jakarta Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-float: 0 8px 24px rgba(0, 0, 0, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 26px;
  -webkit-font-smoothing: antialiased;
}

/* ── 顶栏 ───────────────────────────────────────────── */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(249, 249, 249, .8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--outline-variant);
}

.header-inner {
  height: 56px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--on-surface); }
.brand-mark {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--primary-container); color: var(--on-primary);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head); font-weight: 700; font-size: 20px; line-height: 1;
}
.brand-word { font-family: var(--font-head); font-weight: 600; font-size: 20px; letter-spacing: -.01em; }

.nav { display: none; gap: 32px; }
@media (min-width: 768px) { .nav { display: flex; } }
.nav a { color: var(--on-surface-variant); text-decoration: none; font-size: 15px; line-height: 26px; }
.nav a:hover { color: var(--on-surface); }

.header-actions { display: flex; align-items: center; gap: 16px; }

.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 16px; border-radius: var(--radius-btn);
  background: var(--primary); color: var(--on-primary);
  font-family: var(--font-body); font-size: 14px; font-weight: 500; line-height: 20px;
  text-decoration: none; white-space: nowrap;
}
.btn-primary:hover { background: var(--primary-container); }
.btn-primary[aria-disabled="true"] { opacity: .55; pointer-events: none; }

.avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--primary-container); color: var(--on-primary);
  display: flex; align-items: center; justify-content: center;
}

/* ── 主区 ───────────────────────────────────────────── */
.stage {
  flex: 1;
  padding: 56px var(--gutter) 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pair-card {
  width: 100%;
  max-width: 448px;
  margin: 48px auto;
  padding: 48px;
  background: var(--surface-container-lowest);
  border: 1px solid rgba(196, 199, 199, .3);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 4px 12px; border-radius: var(--radius-full);
  background: var(--surface-container-high); color: var(--on-surface-variant);
  font-size: 12px; font-weight: 500; line-height: 16px;
}
.pill[hidden] { display: none; }
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); flex: none; }

.pair-title {
  margin: 0;
  font-family: var(--font-head); font-size: 24px; font-weight: 700; line-height: 32px;
  color: var(--on-surface);
}

.pair-desc { margin: 0; color: var(--on-surface-variant); font-size: 15px; line-height: 26px; }

.qr-frame {
  width: 224px; height: 224px;
  margin: 8px 0;
  padding: 16px;
  background: var(--surface-bright);
  border: 1px solid rgba(196, 199, 199, .3);
  border-radius: 8px;
  box-shadow: var(--shadow-float);
  display: flex; align-items: center; justify-content: center;
}

.qr-box { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.qr-box svg { width: auto; height: auto; max-width: 100%; max-height: 100%; display: block; }  /* UPG-192：整数像素渲染（可扫性） */

.qr-retry {
  border: 1px solid var(--outline); background: transparent; color: var(--on-surface-variant);
  border-radius: var(--radius-btn); padding: 10px 14px; cursor: pointer;
  font-family: var(--font-body); font-size: 13px; line-height: 20px;
}
.qr-retry[hidden] { display: none; }

.qr-state { color: var(--on-surface-variant); font-size: 14px; font-weight: 500; }

.pair-link {
  color: var(--on-surface); font-size: 13px; font-weight: 700; line-height: 20px;
  text-decoration: none;
}
.pair-link:hover { text-decoration: underline; }

.pair-version { margin: 0; color: var(--ink-muted); font-size: 12px; font-weight: 500; line-height: 16px; }
.pair-version[hidden] { display: none; }

/* ── 页脚（备案悬挂） ───────────────────────────────── */
.site-foot {
  min-height: 40px;
  padding: 0 var(--gutter);
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px;
  color: var(--ink-muted); font-size: 12px; line-height: 16px;
}
.site-foot a { color: var(--ink-muted); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }
.site-foot .beian { height: 14px; vertical-align: middle; margin-right: 3px; }

@media (max-width: 520px) {
  .pair-card { padding: 32px 24px; margin: 32px auto; }
  .qr-frame { width: 200px; height: 200px; }
  .nav { display: none; }
}

/* ── UPG-195 开发者中心首页组件（真文案/真页脚·零外链） ───────────── */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 32px var(--gutter) 8px; }
.crumb { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.crumb .tag { padding: 3px 10px; border-radius: var(--radius-md); background: var(--surface-container-high); color: var(--on-surface-variant); font-size: 11px; font-weight: 600; letter-spacing: .06em; }
.crumb .path { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; color: var(--ink-muted); }

.h1 { margin: 14px 0 10px; font-family: var(--font-head); font-size: 32px; font-weight: 700; line-height: 40px; letter-spacing: -.01em; }
.lead { margin: 0; max-width: 720px; color: var(--on-surface-variant); font-size: 16px; line-height: 26px; }

.cta-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin: 24px 0 8px; }
.cta-note { display: inline-flex; align-items: center; gap: 8px; color: var(--on-surface); font-size: 14px; font-weight: 500; text-decoration: none; }
.cta-note:hover { text-decoration: underline; }
.cta-note svg { color: var(--on-surface-variant); }

.rules { margin: 32px 0 8px; padding: 28px; border: 1px solid var(--outline-variant); border-radius: 14px; background: var(--surface-container-lowest); }
.rules h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 22px; font-family: var(--font-head); font-size: 20px; font-weight: 700; line-height: 28px; }
.rules h2 svg { color: var(--warn, #713f12); flex: none; }
.rules-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
@media (max-width: 900px) { .rules-grid { grid-template-columns: 1fr; } }
.rule-cap { font-size: 11px; font-weight: 600; letter-spacing: .08em; color: var(--ink-muted); margin-bottom: 8px; }
.rule-text { margin: 0; color: var(--on-surface-variant); font-size: 14px; line-height: 24px; }
.rule-text b { color: var(--on-surface); }

.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin: 40px 0 16px; }
.sec-head h2 { margin: 0; font-family: var(--font-head); font-size: 24px; font-weight: 700; line-height: 32px; }
.sec-head .note { color: var(--ink-muted); font-size: 12px; font-weight: 500; letter-spacing: .06em; }

.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 720px) { .cards { grid-template-columns: 1fr; } }
.doc-card { display: flex; flex-direction: column; gap: 10px; padding: 24px; border: 1px solid var(--outline-variant); border-radius: 14px; background: var(--surface-container-lowest); text-decoration: none; color: var(--on-surface); }
.doc-card:hover { background: var(--surface-container-low); }
.doc-card-top { display: flex; align-items: center; justify-content: space-between; }
.doc-card-no { font-size: 12px; font-weight: 600; letter-spacing: .08em; color: var(--ink-muted); }
.doc-card-top svg { color: var(--on-surface-variant); }
.doc-card h3 { margin: 0; font-family: var(--font-head); font-size: 18px; font-weight: 700; line-height: 26px; }
.doc-card p { margin: 0; color: var(--on-surface-variant); font-size: 14px; line-height: 22px; }
.doc-card .more { margin-top: 4px; font-size: 13px; font-weight: 700; }

.llms { margin: 40px 0 56px; padding: 28px; border: 1px solid var(--outline-variant); border-radius: 14px; background: var(--surface-container-lowest); display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.llms .cap { font-size: 11px; font-weight: 600; letter-spacing: .08em; color: var(--ink-muted); }
.llms h2 { margin: 8px 0 10px; font-family: var(--font-head); font-size: 22px; font-weight: 700; line-height: 30px; }
.llms p { margin: 0; color: var(--on-surface-variant); font-size: 14px; line-height: 24px; }
.llms code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; background: var(--surface-container); padding: 2px 6px; border-radius: 6px; }

.site-foot { border-top: 1px solid var(--outline-variant); margin-top: 8px; }
.site-foot .foot-in { max-width: var(--maxw); margin: 0 auto; padding: 20px var(--gutter); display: flex; flex-direction: column; gap: 6px; color: var(--ink-muted); font-size: 13px; line-height: 20px; }
.site-foot a { color: var(--ink-muted); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }
.site-foot .beian { height: 13px; vertical-align: middle; margin-right: 3px; }
.site-foot .sync { font-size: 12px; }