/*
 * SEO 内容页专用样式。
 * 作用域严格限定在 .seo-doc 内，仅补齐 portal.css 未覆盖的正文元素
 * （表格、三/四级标题、行内代码、引用、正文链接、面包屑）。
 * 默认复用 portal.css 变量；阅读页会固定浅色变量，避免系统深色偏好降低对比度。
 */

/* SEO content remains a light reading surface even when the OS prefers dark UI. */
.seo-doc {
  color-scheme: light;
  --panel: #ffffff;
  --panel-soft: #f4f8fb;
  --ink: #03050b;
  --muted: #53637b;
  --muted-2: #7f8da3;
  --line: rgba(123, 145, 170, 0.16);
  --line-strong: rgba(123, 145, 170, 0.26);
  --shadow-soft: 0 4px 12px rgba(16, 40, 84, 0.05);
}

.seo-doc-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 4px;
  color: var(--muted-2);
  font-size: 13px;
  line-height: 1.6;
}

.seo-doc-breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.seo-doc-breadcrumb a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.seo-doc-breadcrumb span[aria-hidden="true"] {
  color: var(--line-strong);
}

.seo-doc .legal-block h3 {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  font-weight: 850;
  line-height: 1.4;
}

.seo-doc .legal-block h4 {
  margin: 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.5;
}

.seo-doc .legal-block ol {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.seo-doc .legal-block ol li {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.seo-doc .legal-block a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.seo-doc .legal-block a:hover {
  text-decoration: underline;
}

.seo-doc .legal-block blockquote {
  margin: 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-wash);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.seo-doc .legal-block blockquote p {
  margin: 0;
}

.seo-doc .legal-block code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
}

.seo-doc-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.seo-doc-table-wrap table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14px;
}

.seo-doc-table-wrap th,
.seo-doc-table-wrap td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.seo-doc-table-wrap th {
  background: var(--panel-soft);
  color: var(--ink);
  font-weight: 850;
  white-space: nowrap;
}

.seo-doc-table-wrap td {
  color: var(--muted);
}

.seo-doc-table-wrap tr:last-child td {
  border-bottom: 0;
}

.seo-doc-hub-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.seo-doc-hub-card {
  display: grid;
  align-content: start;
  gap: 12px;
  min-height: 188px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(160deg, #ffffff 0%, #f4f8fb 100%);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.045);
  text-decoration: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.seo-doc-hub-card:hover {
  border-color: var(--accent);
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.1);
  transform: translateY(-2px);
}

.seo-doc-hub-card strong {
  color: var(--ink);
  font-size: 19px;
  font-weight: 850;
  line-height: 1.42;
  letter-spacing: -0.02em;
}

.seo-doc-hub-summary {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.seo-doc-hub-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.seo-doc-hub-meta b {
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--accent-wash);
  color: var(--accent);
  font-weight: 800;
}

.seo-doc .legal-card {
  width: min(100%, 900px);
  padding: clamp(24px, 5vw, 48px);
}

.seo-doc .legal-head {
  gap: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.seo-doc .legal-body {
  gap: 38px;
}

.seo-doc .legal-block {
  gap: 16px;
}

.seo-doc .legal-block h2 {
  margin-top: 12px;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.3;
}

.seo-doc .legal-block h3 {
  margin-top: 12px;
  font-size: 20px;
}

.seo-doc .legal-block h4 {
  margin-top: 8px;
  font-size: 16px;
}

.seo-doc .legal-block p,
.seo-doc .legal-block li {
  font-size: 16px;
  line-height: 1.9;
}

.seo-doc .legal-block ul,
.seo-doc .legal-block ol {
  gap: 12px;
}

.seo-doc .legal-block pre {
  margin: 4px 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f4f8f6;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
}

.seo-doc .legal-block pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

.seo-doc .legal-block img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 8px auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

@media (max-width: 680px) {
  .seo-doc-hub-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .seo-doc-hub-card {
    min-height: 0;
    padding: 20px;
  }

  .seo-doc .legal-body {
    gap: 30px;
  }

  .seo-doc .legal-block p,
  .seo-doc .legal-block li {
    font-size: 15px;
  }
}