:root{--bg:#f7f8fb;--fg:#1f2937;--muted:#6b7280;--line:#e5e7eb;--card:#fff;--brand:#2563eb;--brand-d:#1d4ed8;--dark:#0b1020;--code:#f1f5f9}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Noto Sans CJK SC",sans-serif}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:.9em}
code{background:var(--code);padding:.1em .35em;border-radius:4px}
pre{background:#0f172a;color:#e2e8f0;padding:16px;border-radius:10px;overflow:auto;line-height:1.6}
pre code{background:none;padding:0;color:inherit}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
.topbar{background:var(--dark);color:#fff;position:sticky;top:0;z-index:10}
.topbar-inner{max-width:1080px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{color:#fff;font-weight:700;font-size:18px}.brand:hover{text-decoration:none}
.brand-mark{color:#60a5fa;margin-right:6px}.brand-dot{color:#60a5fa}.brand-sub{color:#94a3b8;font-weight:400;font-size:14px;margin-left:6px}
.topbar-links{display:flex;gap:16px;align-items:center;font-size:14px}.topbar-links a{color:#cbd5e1}
.btn{display:inline-block;background:var(--brand);color:#fff!important;padding:8px 16px;border-radius:8px;font-weight:600}.btn:hover{background:var(--brand-d);text-decoration:none}
.breadcrumb{font-size:14px;color:var(--muted);margin:20px 0 0}.breadcrumb span[aria-hidden]{margin:0 8px}
.article,.hero{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px 32px;margin:16px 0 32px}
.eyebrow{color:var(--brand);font-size:14px;font-weight:600;margin:0}
h1{font-size:30px;line-height:1.35;margin:8px 0 12px}
h2{font-size:23px;line-height:1.4;margin:40px 0 14px;padding-top:12px;border-top:1px solid var(--line)}
h3{font-size:19px;margin:28px 0 10px}
.meta{color:var(--muted);font-size:14px;margin:0 0 8px}
blockquote{margin:16px 0;padding:10px 16px;border-left:4px solid var(--brand);background:#eff6ff;color:#374151;border-radius:0 8px 8px 0}
blockquote p{margin:4px 0}
hr{border:0;border-top:1px solid var(--line);margin:28px 0}
.table-scroll{overflow-x:auto;margin:16px 0}
table{border-collapse:collapse;width:100%;font-size:14.5px;line-height:1.6}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
th{background:#f3f4f6}
.cta{margin:36px 0 0;padding:20px;border-radius:12px;background:linear-gradient(135deg,#eff6ff,#e0e7ff);border:1px solid #c7d2fe}
.cta p{margin:0 0 12px}
.lead{font-size:16.5px;color:#374151}
.vendor-nav{font-size:14px;color:var(--muted)}
.vendor h2{border:0;margin:28px 0 12px;padding:0}
.cards{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card a{display:flex;flex-direction:column;gap:6px;height:100%;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;color:var(--fg);transition:border-color .15s,box-shadow .15s}
.card a:hover{text-decoration:none;border-color:var(--brand);box-shadow:0 4px 16px rgba(37,99,235,.12)}
.card-title{font-weight:700;font-size:18px}.card code{align-self:flex-start;font-size:13px}
.card-desc{color:#4b5563;font-size:14.5px;line-height:1.65;flex:1}.card-more{color:var(--brand);font-size:14px;font-weight:600}
.site-footer{border-top:1px solid var(--line);padding:24px 0 40px;font-size:14px}
.muted{color:var(--muted)}
@media (max-width:640px){.article,.hero{padding:20px 18px;border-radius:10px}h1{font-size:24px}h2{font-size:20px}.brand-sub{display:none}}