:root{--blue:#0096fa;--blue-dark:#0073c2;--blue-soft:#e8f5ff;--bg:#f5f9fc;--fg:#1f2329;--muted:#5b6470;--card:#fff;--line:#dbe7f0;--warn:#b54708;--warnbg:#fff7ed}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
.topbar{background:var(--blue);color:#fff}
header,main,footer{max-width:860px;margin:0 auto;padding:0 16px}
header{padding-top:14px;padding-bottom:14px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
header a.brand{font-weight:700;color:#fff;text-decoration:none;font-size:18px}
nav a{margin-left:14px;color:#fff;opacity:.9;text-decoration:none;font-size:15px}nav a:hover{opacity:1;text-decoration:underline}
h1{font-size:28px;line-height:1.35;margin:28px 0 8px}h2{font-size:21px;margin:36px 0 10px;padding-left:10px;border-left:4px solid var(--blue)}h3{font-size:17px;margin:20px 0 6px}
.lead{color:var(--muted)}
.card{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:14px 0}
.note{background:var(--warnbg);border-left:4px solid var(--warn);padding:12px 16px;border-radius:6px;margin:16px 0}
.promo{background:var(--blue-soft);border:1px solid #b9e0fd;border-radius:12px;padding:18px 20px;margin:20px 0}
.promo h3{margin:0 0 6px;color:var(--blue-dark)}.promo p{margin:6px 0}
.promo .small{font-size:13px;color:var(--muted)}
.btn{display:inline-block;background:var(--blue);color:#fff!important;text-decoration:none;font-weight:700;padding:10px 22px;border-radius:999px;margin:8px 0 4px}
.btn:hover{background:var(--blue-dark)}
table{table-layout:fixed;width:100%;border-collapse:collapse;font-size:15px}th,td{overflow-wrap:anywhere;border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}th{color:var(--blue-dark)}
code{word-break:break-all;background:#eef4f9;padding:1px 5px;border-radius:4px}a{color:var(--blue)}
footer{color:var(--muted);font-size:14px;border-top:1px solid var(--line);margin-top:48px;padding-top:16px;padding-bottom:32px}