/* xdfair 文档站增量样式（实施清单 §6.15 / D6）。
   只放文档站页面需要的类；主色/铜色/纸色统一从现役 site.css 的 .op-body 变量派生。
   不改 site.css，不引入 Web Font / 第三方 CSS / 远程图片。 */

:root {
  --doc-paper: #f6f1e6;
  --doc-paper-2: #efe8d9;
  --doc-ink: #17212e;
  --doc-muted: #5d6573;
  --doc-line: #d8cfbf;
  --doc-copper: #9a5522;
  --doc-code: #101a28;
  --doc-code-ink: #e8eef6;
  --doc-ok: #2f6b46;
  --doc-danger: #8a2f2f;
  --doc-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.xd-docs-body {
  color-scheme: dark;
  background-color: #0e2a47;
}

.xd-shell {
  width: min(100% - 48px, 1180px);
  margin: 0 auto;
  padding: 20px 0 48px;
}

.xd-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(226, 238, 250, 0.52);
}

.xd-nav-brand {
  font-family: var(--doc-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: #eaf2fa;
  text-decoration: none;
}

.xd-nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.xd-nav-links a {
  font-size: 13px;
  color: #93aac6;
  text-decoration: none;
}

.xd-nav-links a:hover,
.xd-nav-links a[aria-current="page"] {
  color: #eaf2fa;
}

.xd-nav-links a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: #e1904a;
  text-underline-offset: 6px;
}

.xd-nav-cta {
  color: #08182b !important;
  background: #e1904a;
  padding: 6px 12px;
  font-weight: 700;
}

.xd-nav-cta:hover {
  filter: brightness(1.06);
}

.xd-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding: 38px 0 30px;
}

.xd-hero-eyebrow {
  margin: 0 0 10px;
  font-family: var(--doc-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: #e1904a;
  text-transform: uppercase;
}

.xd-hero h1 {
  margin: 0;
  font-size: clamp(34px, 4.2vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: #eaf2fa;
}

.xd-hero-lead {
  margin: 14px 0 0;
  max-width: 720px;
  color: #93aac6;
  font-size: 16px;
  line-height: 1.7;
}

.xd-hero-stamp {
  align-self: start;
  min-width: 178px;
  border: 1px solid rgba(226, 238, 250, 0.52);
  padding: 12px 14px;
  font-family: var(--doc-mono);
  font-size: 11px;
  line-height: 1.9;
  color: #93aac6;
  letter-spacing: 0.04em;
}

.xd-hero-stamp strong {
  display: block;
  color: #eaf2fa;
  font-weight: 600;
}

.xd-hero-stamp .copper {
  color: #e1904a;
}

.xd-trust {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(226, 238, 250, 0.52);
  max-width: 640px;
  color: #eaf2fa;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.xd-trust::before {
  content: "TRUST · ";
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #e1904a;
}

.xd-paper {
  position: relative;
  min-width: 0;
  background: var(--doc-paper);
  color: var(--doc-ink);
  border: 1px solid rgba(226, 238, 250, 0.28);
  box-shadow: 0 30px 60px -44px rgba(0, 0, 0, 0.85);
  padding: clamp(22px, 4vw, 46px);
}

.xd-paper::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(23, 33, 46, 0.08);
  pointer-events: none;
}

.xd-paper a {
  color: var(--doc-copper);
}

.xd-paper .mono {
  font-family: var(--doc-mono);
}

.xd-paper h1,
.xd-paper h2,
.xd-paper h3,
.xd-paper h4 {
  color: var(--doc-ink);
}

.xd-paper h2 {
  margin: 38px 0 12px;
  font-size: 24px;
  line-height: 1.3;
}

.xd-paper h3 {
  margin: 28px 0 10px;
  font-size: 18px;
}

.xd-paper p,
.xd-paper li {
  font-size: 15px;
  line-height: 1.8;
}

.xd-paper ul,
.xd-paper ol {
  padding-left: 22px;
}

.xd-paper blockquote {
  margin: 24px 0 30px;
  padding: 16px 20px;
  border-left: 3px solid var(--doc-copper);
  background: var(--doc-paper-2);
}

.xd-paper blockquote > :first-child {
  margin-top: 0;
}

.xd-paper blockquote > :last-child {
  margin-bottom: 0;
}

.xd-paper .citation {
  margin: 24px 0 30px;
  padding: 16px 20px;
  border-left: 3px solid var(--doc-copper);
  background: var(--doc-paper-2);
  font-size: 14px;
  line-height: 1.75;
}

.xd-paper .citation p {
  margin: 0;
}

.xd-paper .answer-first {
  margin: 24px 0 0;
  font-size: 17px;
  line-height: 1.75;
}

.xd-table-wrap {
  overflow-x: auto;
  max-width: 100%;
  margin: 16px 0 24px;
  border: 1px solid var(--doc-line);
}

.xd-paper table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 560px;
}

.xd-paper th,
.xd-paper td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--doc-line);
  text-align: left;
  vertical-align: top;
}

.xd-paper th {
  background: var(--doc-paper-2);
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--doc-muted);
}

.xd-code-card {
  margin: 16px 0 24px;
  max-width: 100%;
  min-width: 0;
  background: var(--doc-code);
  color: var(--doc-code-ink);
  border: 1px solid rgba(23, 33, 46, 0.5);
}

.xd-code-card pre {
  margin: 0;
  max-width: 100%;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--doc-mono);
  font-size: 12.5px;
  line-height: 1.7;
}

.xd-code-card code {
  font-family: inherit;
}

.xd-paper code {
  font-family: var(--doc-mono);
  font-size: 0.92em;
  background: rgba(23, 33, 46, 0.07);
  padding: 1px 4px;
  word-break: break-word;
}

.xd-code-card code {
  background: transparent;
  padding: 0;
  word-break: normal;
}

.xd-paths {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 34px;
}

.xd-path {
  border-top: 2px solid var(--doc-ink);
  padding: 14px 2px 0;
}

.xd-path .no {
  font-family: var(--doc-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--doc-copper);
}

.xd-path h2 {
  margin: 8px 0 6px;
  font-size: 19px;
  line-height: 1.3;
}

.xd-path p {
  margin: 0;
  color: var(--doc-muted);
  font-size: 13px;
  line-height: 1.65;
}

.xd-doc-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 44px;
  align-items: start;
}

.xd-doc-groups > .xd-group:nth-child(1) { grid-column: 1; grid-row: 1; }
.xd-doc-groups > .xd-group:nth-child(2) { grid-column: 2; grid-row: 1; }
.xd-doc-groups > .xd-group:nth-child(3) { grid-column: 1; grid-row: 2; }
.xd-doc-groups > .xd-group:nth-child(4) { grid-column: 2; grid-row: 2; }

.xd-group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--doc-line);
  padding-bottom: 8px;
  margin-bottom: 4px;
}

.xd-group-head h2 {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--doc-muted);
}

.xd-group-head span {
  font-family: var(--doc-mono);
  font-size: 10px;
  color: var(--doc-copper);
}

.xd-doc-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 13px 2px;
  border-bottom: 1px solid rgba(23, 33, 46, 0.08);
  text-decoration: none;
  color: inherit;
}

.xd-doc-row:hover {
  background: rgba(154, 85, 34, 0.06);
}

.xd-doc-row .no {
  font-family: var(--doc-mono);
  font-size: 12px;
  color: var(--doc-copper);
}

.xd-doc-row .title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
}

.xd-doc-row .summary {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  font-weight: 400;
  color: var(--doc-muted);
  line-height: 1.55;
}

.xd-doc-row .meta {
  font-family: var(--doc-mono);
  font-size: 10px;
  color: var(--doc-muted);
  white-space: nowrap;
}

.xd-paper-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--doc-line);
}

.xd-paper-cta .primary,
.xd-paper-cta .secondary {
  display: inline-block;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--doc-ink);
}

.xd-paper-cta .primary {
  background: var(--doc-ink);
  color: var(--doc-paper);
}

.xd-paper-cta .secondary {
  background: transparent;
  color: var(--doc-ink);
}

.xd-doc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 28px;
  align-items: start;
}

.xd-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: 18px;
  font-family: var(--doc-mono);
  font-size: 11px;
  color: #93aac6;
}

.xd-breadcrumb a {
  color: #93aac6;
  text-decoration: none;
}

.xd-breadcrumb a:hover {
  color: #eaf2fa;
}

.xd-breadcrumb .sep {
  color: rgba(226, 238, 250, 0.3);
}

.xd-article-head {
  padding-bottom: 20px;
  border-bottom: 2px solid var(--doc-ink);
}

.xd-article-head .kicker {
  margin: 22px 0 8px;
  font-family: var(--doc-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--doc-copper);
}

.xd-article-head h1 {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.16;
  color: var(--doc-ink);
}

.xd-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 16px;
  font-family: var(--doc-mono);
  font-size: 11px;
  color: var(--doc-muted);
}

.xd-toc {
  position: sticky;
  top: 24px;
  border: 1px solid rgba(226, 238, 250, 0.52);
  padding: 16px 16px 18px;
  background: rgba(8, 24, 43, 0.32);
}

.xd-toc h2 {
  margin: 0 0 10px;
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #e1904a;
  text-transform: uppercase;
}

.xd-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.xd-toc li {
  counter-increment: toc;
  margin: 0;
}

.xd-toc a {
  display: block;
  padding: 7px 0;
  border-bottom: 1px solid rgba(226, 238, 250, 0.12);
  color: #93aac6;
  font-size: 12.5px;
  line-height: 1.4;
  text-decoration: none;
}

.xd-toc a::before {
  content: counter(toc, decimal-leading-zero) " · ";
  font-family: var(--doc-mono);
  color: rgba(226, 238, 250, 0.3);
}

.xd-toc a:hover {
  color: #eaf2fa;
}

.xd-doc-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--doc-line);
  font-size: 12px;
  color: var(--doc-muted);
}

.xd-doc-foot .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.xd-doc-foot a {
  text-decoration: none;
  border: 1px solid var(--doc-line);
  padding: 7px 11px;
  font-size: 12px;
  color: var(--doc-ink);
}

/* 文档页「复制给 AI」：无 JS 时按钮不出现（脚本只绑定已存在的按钮），
   页面与 .md 下载链接保持可用。 */
.xd-doc-foot .copy-ai {
  border: 1px solid var(--doc-copper);
  background: var(--doc-copper);
  padding: 7px 11px;
  font: inherit;
  font-size: 12px;
  color: var(--doc-paper);
  cursor: pointer;
}

.xd-doc-foot .copy-ai[hidden] {
  display: none;
}

.xd-doc-foot .copy-ai:hover {
  filter: brightness(1.08);
}

.xd-doc-foot .copy-ai:focus-visible {
  outline: 2px solid var(--doc-ink);
  outline-offset: 2px;
}

.xd-doc-foot .copy-ai[data-state="done"] {
  border-color: var(--doc-ok);
  background: var(--doc-ok);
}

.xd-doc-foot .copy-ai[data-state="error"] {
  border-color: var(--doc-danger);
  background: var(--doc-danger);
}

.xd-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.xd-pager a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--doc-line);
  text-decoration: none;
  color: var(--doc-ink);
}

.xd-pager .dir {
  display: block;
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--doc-muted);
}

.xd-pager .name {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 600;
}

.xd-dl-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 30px;
}

/* 分发通道状态（§12.4-5）：公开仓滞后时必须如实可见，不写成「已同源」。 */
.xd-channel {
  margin: 0 0 22px;
  padding: 12px 14px;
  border-left: 3px solid var(--doc-copper);
  background: rgba(154, 85, 34, 0.07);
  color: var(--doc-ink);
  font-size: 13px;
  line-height: 1.7;
}

.xd-channel strong {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--doc-copper);
}

.xd-pkg {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--doc-line);
  background: rgba(255, 255, 255, 0.22);
  padding: 20px 18px 18px;
}

.xd-pkg .no {
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--doc-copper);
}

.xd-pkg h2 {
  margin: 8px 0 4px;
  font-size: 20px;
}

.xd-pkg .desc {
  margin: 0 0 16px;
  color: var(--doc-muted);
  font-size: 12.5px;
  line-height: 1.6;
}

.xd-pkg dl {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 10px;
  margin: 0 0 16px;
  font-size: 11px;
}

.xd-pkg dt {
  color: var(--doc-muted);
}

.xd-pkg dd {
  margin: 0;
  font-family: var(--doc-mono);
  font-size: 10.5px;
  word-break: break-all;
}

.xd-pkg .buttons {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

.xd-pkg .buttons a {
  flex: 1;
  text-align: center;
  border: 1px solid var(--doc-ink);
  padding: 8px 6px;
  font-family: var(--doc-mono);
  font-size: 10.5px;
  text-decoration: none;
  color: var(--doc-ink);
}

.xd-pkg .buttons a:first-child {
  background: var(--doc-ink);
  color: var(--doc-paper);
}

.xd-content h1 {
  margin: 0 0 14px;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.16;
}

.xd-content > :first-child {
  margin-top: 0;
}

.xd-footer {
  display: grid;
  gap: 20px;
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(226, 238, 250, 0.52);
  color: #93aac6;
  font-size: 11px;
}

.xd-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.xd-footer h2 {
  margin: 0 0 8px;
  font-family: var(--doc-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: #e1904a;
  text-transform: uppercase;
}

.xd-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.xd-footer li {
  margin: 4px 0;
}

.xd-footer a {
  color: #93aac6;
  text-decoration: none;
}

.xd-footer a:hover {
  color: #eaf2fa;
}

.xd-footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(226, 238, 250, 0.2);
}

.xd-footer-legal a {
  margin-right: 14px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #e1904a;
  color: #08182b;
  padding: 8px 12px;
  z-index: 10;
}

.skip-link:focus {
  left: 12px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .xd-hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .xd-hero-stamp {
    justify-self: start;
  }

  .xd-paths,
  .xd-dl-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .xd-doc-groups {
    grid-template-columns: minmax(0, 1fr);
  }

  .xd-doc-groups > .xd-group:nth-child(n) {
    grid-column: auto;
    grid-row: auto;
  }

  .xd-doc-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .xd-toc {
    position: static;
    order: -1;
  }

  .xd-footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .xd-shell {
    width: min(100% - 32px, 1180px);
    padding-top: 14px;
  }

  .xd-nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .xd-nav-links {
    gap: 12px 16px;
  }

  .xd-hero {
    padding: 26px 0 22px;
  }

  .xd-paper {
    padding: 20px 16px 26px;
  }

  .xd-paper::before {
    inset: 5px;
  }

  .xd-doc-row {
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .xd-doc-row .meta {
    grid-column: 2;
    margin-top: 2px;
  }

  .xd-pager {
    grid-template-columns: minmax(0, 1fr);
  }

  .xd-footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* --- FAQ / details --- */
.xd-faq {
  border-bottom: 1px solid var(--doc-line);
  padding: 14px 0;
}

.xd-faq summary {
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--doc-ink);
}

.xd-faq summary::marker {
  color: var(--doc-copper);
}

.xd-faq-answer {
  padding: 8px 0 0 18px;
}

.xd-faq-answer > :first-child {
  margin-top: 0;
}

.xd-faq-answer > :last-child {
  margin-bottom: 0;
}