/* wuyoulianjie.xyz — 无忧链接使用中心，Modern Help Center 设计系统（v4，与homes共享设计语言，强调色不同）。
   深色科技底 + 靛蓝/青强调色，保留左侧目录分栏（唯一Help/Docs结构），但整体视觉与其余6站统一为科技感。 */

:root {
  --bg: #0a0d14;
  --bg-alt: #0d1119;
  --bg-panel: #10151f;
  --ink: #f2f5fa;
  --ink-soft: #9aa4b3;
  --ink-dim: #6b7484;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --glass: rgba(255, 255, 255, 0.035);
  --glass-hover: rgba(255, 255, 255, 0.06);
  --accent: #6366f1;
  --accent2: #22d3ee;
  --accent-rgb: 99, 102, 241;
  --accent2-rgb: 34, 211, 238;
  --ok: #34d399;
  --radius: 14px;
  --radius-sm: 8px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); line-height: 1.7; overflow-x: hidden; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header { background: rgba(10, 13, 20, 0.8); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; gap: 14px; padding: 14px 20px; max-width: 1200px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 700; font-size: 15px; }
.brand-mark { font-family: var(--mono); color: var(--accent2); font-size: 14px; }
.header-cta { margin-left: auto; }
.toc-toggle { display: none; background: var(--glass); border: 1px solid var(--border); border-radius: 8px; cursor: pointer; width: 34px; height: 34px; flex-direction: column; justify-content: center; align-items: center; gap: 4px; }
.toc-toggle span { display: block; width: 16px; height: 1.5px; background: var(--ink); }

.doc-shell { display: flex; max-width: 1200px; margin: 0 auto; align-items: flex-start; }
.doc-sidebar { width: 230px; flex-shrink: 0; padding: 24px 16px; position: sticky; top: 57px; height: calc(100vh - 57px); overflow-y: auto; border-right: 1px solid var(--border); }
.toc-group { margin-bottom: 22px; }
.toc-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--ink-dim); margin-bottom: 10px; font-weight: 700; font-family: var(--mono); }
.doc-sidebar a { display: block; padding: 7px 10px; border-radius: var(--radius-sm); font-size: 13.5px; color: var(--ink-soft); margin-bottom: 2px; }
.doc-sidebar a:hover { background: var(--glass); text-decoration: none; }
.doc-sidebar a.active { background: rgba(99, 102, 241, 0.14); color: #a5b4fc; font-weight: 700; }

.doc-main { flex: 1; min-width: 0; padding: 0 30px 60px; }
.breadcrumb { font-size: 12px; color: var(--ink-dim); padding: 18px 0 0; }
.breadcrumb a { color: var(--ink-dim); }

.page-wrap { max-width: 800px; padding: 16px 0 0; }

h1 { font-size: 28px; margin: 8px 0 16px; letter-spacing: -0.3px; }
h2 { font-size: 21px; margin: 32px 0 12px; }
h3 { font-size: 15px; margin: 18px 0 8px; font-family: var(--mono); color: var(--ink); }
p { font-size: 14.5px; margin: 0 0 14px; color: var(--ink-soft); }
p.lede { font-size: 16px; color: var(--ink-soft); }
ul, ol { margin: 0 0 16px 20px; color: var(--ink-soft); }
li { margin-bottom: 6px; }

code, .kbd { font-family: var(--mono); background: rgba(255,255,255,0.06); border-radius: 4px; padding: 1px 6px; font-size: 13px; color: var(--accent2); }

.btn-cta { display: inline-block; background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); color: #fff !important; padding: 11px 22px; border-radius: var(--radius-sm); font-weight: 700; font-size: 14px; text-decoration: none !important; box-shadow: 0 8px 22px rgba(var(--accent-rgb), 0.3); }
.btn-cta:hover { text-decoration: none; box-shadow: 0 10px 28px rgba(var(--accent-rgb), 0.4); }
.btn-cta-sm { padding: 8px 16px; font-size: 12.5px; }
.btn-secondary { display: inline-block; background: var(--glass); color: var(--ink) !important; padding: 10px 20px; border-radius: var(--radius-sm); font-weight: 700; font-size: 13.5px; border: 1px solid var(--border-strong); text-decoration: none !important; }
.btn-secondary:hover { border-color: rgba(255,255,255,0.3); text-decoration: none; }

.glass-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }

/* docs intro banner */
.docs-hero { position: relative; overflow: hidden; border-radius: var(--radius); padding: 34px 30px; margin: 20px 0 32px; background: linear-gradient(135deg, rgba(99,102,241,0.14) 0%, rgba(34,211,238,0.06) 100%); border: 1px solid var(--border-strong); }
.docs-hero .hero-eyebrow { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; letter-spacing: 1px; text-transform: uppercase; color: var(--accent2); font-weight: 700; margin-bottom: 12px; font-family: var(--mono); }
.docs-hero h1 { margin: 0 0 12px; }
.docs-hero p.lede { margin-bottom: 20px; }
.docs-hero-cta-row { display: flex; flex-wrap: wrap; gap: 10px; }

.quick-nav-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 0 0 32px; }
.quick-nav-card { display: block; background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-align: center; color: var(--ink); }
.quick-nav-card:hover { border-color: rgba(var(--accent-rgb), 0.4); text-decoration: none; }
.quick-nav-card .qn-icon { font-family: var(--mono); font-size: 18px; color: var(--accent2); display: block; margin-bottom: 8px; }
.quick-nav-card .qn-title { font-weight: 700; font-size: 13.5px; display: block; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 0 0 20px; }
.feature-card { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.feature-icon { width: 30px; height: 30px; border-radius: 6px; background: rgba(99,102,241,0.16); border: 1px solid rgba(99,102,241,0.3); color: #a5b4fc; display: flex; align-items: center; justify-content: center; font-family: var(--mono); font-size: 13px; margin-bottom: 10px; }
.feature-card h3 { margin: 0 0 6px; font-family: inherit; }
.feature-card p { font-size: 13px; color: var(--ink-soft); margin: 0; }

.step-block { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 14px; }
.step-block h3 { margin-top: 0; }
.step-block .step-n { display: inline-block; background: var(--accent); color: #fff; border-radius: 4px; padding: 1px 8px; font-family: var(--mono); font-size: 12px; margin-right: 8px; }

.device-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); margin: 12px 0 20px; }
table.device-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 480px; }
table.device-table th, table.device-table td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); color: var(--ink-soft); }
table.device-table th { background: var(--bg-alt); font-size: 12px; color: var(--ink-dim); }

.trouble-item { border-left: 3px solid var(--accent); padding: 4px 0 4px 14px; margin-bottom: 16px; background: var(--glass); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 16px 14px 16px; border-left-width: 3px; }
.trouble-item h3 { margin: 0 0 4px; font-family: inherit; font-weight: 700; }

.faq-list { max-width: 780px; }
.faq-item { background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px 18px; margin-bottom: 8px; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 14.5px; color: var(--ink); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--ink-dim); font-size: 16px; }
.faq-item[open] summary::after { content: "–"; }
.faq-a { margin-top: 8px; color: var(--ink-soft); font-size: 13.5px; }

.callout { background: var(--glass); border: 1px solid var(--border); border-left: 3px solid var(--ok); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 12px 16px; margin: 18px 0; font-size: 13.5px; color: var(--ink-soft); }

.inline-cta { margin: 24px 0; padding: 18px; background: var(--glass); border: 1px solid var(--border); border-radius: var(--radius); text-align: center; }
.inline-cta p { margin-bottom: 10px; font-weight: 600; font-size: 14px; color: var(--ink); }

.related-box { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; margin: 24px 0; background: var(--glass); }
.related-box h3 { margin: 0 0 8px; font-family: inherit; font-size: 13.5px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--ink-dim); }
.related-box ul { margin: 0; padding-left: 18px; }
.related-box li { margin-bottom: 4px; font-size: 13.5px; }

.site-footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 20px 0; font-size: 11px; color: var(--ink-dim); }
.footer-disclosure { max-width: 780px; }
.footer-matrix, .footer-friends { max-width: 780px; margin: 0 0 8px; }
.footer-matrix a, .footer-friends a { color: var(--ink-soft); }

@media (max-width: 900px) {
  .toc-toggle { display: flex; }
  .doc-sidebar { position: fixed; top: 57px; left: 0; bottom: 0; background: var(--bg); z-index: 45; transform: translateX(-100%); transition: transform 0.2s; width: 260px; }
  .doc-sidebar.is-open { transform: translateX(0); box-shadow: 4px 0 20px rgba(0,0,0,0.4); }
  .doc-main { padding: 0 18px 50px; }
  h1 { font-size: 22px; }
  .quick-nav-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
  .docs-hero { padding: 24px 20px; }
}