:root{--bg:#f6f8fb;--panel:#fff;--text:#172033;--muted:#5c6b7a;--line:#dbe4ee;--brand:#2468a2;--brand2:#184b78;--code:#111827;--note:#eef6fc;--warn:#fff8e6;--ok:#edf9f1;--danger:#fff0f0}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}
a{color:var(--brand)}code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}.topbar{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:12px 24px;gap:16px}.brand{font-weight:800;font-size:20px;text-decoration:none;color:var(--brand2);white-space:nowrap}.toplinks{display:flex;gap:14px;flex-wrap:wrap}.toplinks a{text-decoration:none;font-weight:600}.nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--brand2);border-radius:8px;padding:7px 11px;font-weight:700;cursor:pointer}.layout{max-width:1320px;margin:0 auto;display:grid;grid-template-columns:285px minmax(0,1fr);gap:28px;padding:28px 24px 60px}.sidebar{position:sticky;top:78px;align-self:start;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;max-height:calc(100vh - 100px);overflow:auto}.sidebar h3{margin:0 0 10px;font-size:15px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.sidebar a{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:#31465a;font-size:14px}.sidebar a:hover,.sidebar a.active{background:#eaf3fb;color:#154d79;font-weight:700}.side-group{margin:16px 8px 5px;padding-top:12px;border-top:1px solid var(--line);font-size:12px;font-weight:800;color:#738293;text-transform:uppercase;letter-spacing:.05em}.side-group:first-of-type{margin-top:10px}.content{min-width:0}.hero,.article{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:34px}.hero{background:linear-gradient(135deg,#fff,#edf6fd)}.hero h1,.article h1{margin-top:0;font-size:34px;line-height:1.25}.hero p.lead,.article .lead{font-size:18px;color:#3f5367}.article h2{margin-top:40px;padding-bottom:8px;border-bottom:1px solid var(--line);font-size:25px}.article h3{margin-top:28px;font-size:20px}.article p,.article li{font-size:16px}.article kbd{background:#eef2f6;border:1px solid #c8d2dc;border-bottom-width:2px;border-radius:5px;padding:1px 6px;font-family:inherit}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:22px 0}.card{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;text-decoration:none;color:inherit}.card:hover{border-color:#8fb7d6;box-shadow:0 5px 18px rgba(21,77,121,.08)}.card strong{display:block;color:var(--brand2);font-size:18px;margin-bottom:5px}.card span{color:var(--muted)}.codebox{position:relative;margin:16px 0 24px}.codebox pre{margin:0;background:var(--code);color:#e8eef7;border-radius:12px;padding:20px;overflow:auto;line-height:1.6;font-size:13px}.copy{position:absolute;right:10px;top:10px;border:1px solid #526075;background:#243047;color:#fff;border-radius:7px;padding:5px 10px;cursor:pointer;z-index:2}.note,.warning,.tip,.danger{padding:15px 18px;border-radius:10px;margin:18px 0}.note{background:var(--note);border-left:4px solid #3e82b8}.warning{background:var(--warn);border-left:4px solid #d39a21}.tip{background:var(--ok);border-left:4px solid #3c9960}.danger{background:var(--danger);border-left:4px solid #cf4b4b}.steps{counter-reset:step;list-style:none;padding:0}.steps>li{counter-increment:step;margin:18px 0;padding:18px 18px 18px 56px;background:#fff;border:1px solid var(--line);border-radius:12px;position:relative}.steps>li:before{content:counter(step);position:absolute;left:17px;top:17px;width:27px;height:27px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;margin:18px 0;background:#fff}th,td{border:1px solid var(--line);padding:11px 12px;text-align:left;vertical-align:top}th{background:#eef4f8}.pager{display:flex;justify-content:space-between;gap:15px;margin-top:30px}.pager a{background:#fff;border:1px solid var(--line);padding:10px 15px;border-radius:9px;text-decoration:none;font-weight:600}.demo-title{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.badge{font-size:12px;border-radius:999px;background:#eaf3fb;color:#15527e;padding:4px 9px;font-weight:700}.toc{columns:2;column-gap:28px}.toc a{display:block;margin:7px 0}.checklist li{margin:8px 0}.expected{background:#f1f5f9;border:1px solid var(--line);padding:12px 15px;border-radius:9px}.footer{text-align:center;color:var(--muted);padding:25px}.legacy-anchor{display:block;position:relative;top:-90px;visibility:hidden}
@media(max-width:900px){.layout{grid-template-columns:1fr}.sidebar{display:none;position:static;max-height:none}.sidebar.open{display:block}.nav-toggle{display:inline-block}.cards{grid-template-columns:1fr}.topbar{position:sticky}.toc{columns:1}}
@media(max-width:560px){.layout{padding:14px 12px 40px}.hero,.article{padding:22px 17px}.hero h1,.article h1{font-size:28px}.topbar{padding:10px 12px;align-items:flex-start;flex-wrap:wrap}.toplinks{font-size:13px;gap:9px}.pager{flex-direction:column}.copy{display:block;padding:4px 8px;font-size:12px}.codebox pre{padding:48px 16px 18px;font-size:12px}.sidebar{padding:14px}}