:root {
  --ink: #16202b;
  --muted: #5c6b7a;
  --line: #e2e8ef;
  --brand: #0b4f75;
  --brand-2: #0e7fa8;
  --bg: #f6f8fa;
  --card: #fff;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 34, 51, .06), 0 6px 20px rgba(16, 34, 51, .05);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--brand-2); text-decoration: none; }
a:hover { color: var(--brand); text-decoration: underline; }

.wrap { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--brand);
  color: #fff; padding: 10px 16px; z-index: 99;
}
.skip:focus { left: 0; }

/* header */
.site-head {
  background: linear-gradient(180deg, #0b4f75 0%, #0a466a 100%);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.head-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 62px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.brand:hover { text-decoration: none; color: #fff; }
.brand-mark {
  width: 26px; height: 26px; flex: 0 0 auto; border-radius: 6px;
  background: #fff;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M21 16v-2l-8-5V3.5a1.5 1.5 0 0 0-3 0V9l-8 5v2l8-2.5V19l-2 1.5V22l3.5-1 3.5 1v-1.5L13 19v-5.5z'/></svg>") center/contain no-repeat;
  mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M21 16v-2l-8-5V3.5a1.5 1.5 0 0 0-3 0V9l-8 5v2l8-2.5V19l-2 1.5V22l3.5-1 3.5 1v-1.5L13 19v-5.5z'/></svg>") center/contain no-repeat;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 18px; letter-spacing: .5px; }
.brand-text small { font-size: 12px; opacity: .72; }

.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: rgba(255, 255, 255, .82); padding: 6px 12px; border-radius: 6px; font-size: 15px;
}
.site-nav a:hover { background: rgba(255, 255, 255, .12); color: #fff; text-decoration: none; }
.site-nav a.on { background: rgba(255, 255, 255, .18); color: #fff; }

/* breadcrumb */
.crumb { padding: 14px 0 0; font-size: 13px; color: var(--muted); }
.crumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.crumb li + li::before { content: "/"; margin-right: 6px; color: #b9c4cf; }
.crumb a { color: var(--muted); }
.crumb span[aria-current] { color: var(--ink); }

/* main */
main { padding: 18px 0 56px; }

h1 { font-size: clamp(22px, 4vw, 30px); line-height: 1.35; margin: 8px 0 6px; letter-spacing: -.3px; }
h2 { font-size: 19px; margin: 34px 0 12px; padding-left: 10px; border-left: 3px solid var(--brand-2); line-height: 1.4; }
h3 { font-size: 16px; margin: 22px 0 8px; }
p { margin: 10px 0; }

.lead { color: #33414f; font-size: 16.5px; }

.tagrow { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: #eaf3f8; color: var(--brand); border: 1px solid #d3e6f0;
  border-radius: 999px; padding: 3px 11px; font-size: 13px; font-weight: 600;
}
.tag.code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .5px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow); margin: 16px 0;
}

.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(148px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 16px 0; }
.fact { background: #fff; padding: 13px 15px; }
.fact dt { font-size: 12.5px; color: var(--muted); margin: 0 0 3px; }
.fact dd { margin: 0; font-size: 16px; font-weight: 650; letter-spacing: -.2px; word-break: break-word; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 420px; }
thead th { background: #f0f4f8; text-align: left; font-weight: 650; font-size: 13.5px; color: #42505f; padding: 10px 14px; white-space: nowrap; }
tbody td { padding: 10px 14px; border-top: 1px solid var(--line); }
tbody tr:hover { background: #fafcfe; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 10px; margin: 14px 0; }
.grid a {
  display: block; background: #fff; border: 1px solid var(--line); border-radius: 8px;
  padding: 11px 13px; color: var(--ink); transition: border-color .15s, transform .15s;
}
.grid a:hover { border-color: var(--brand-2); text-decoration: none; transform: translateY(-1px); }
.grid a b { display: block; font-size: 15px; font-weight: 650; }
.grid a span { font-size: 12.5px; color: var(--muted); }

.chip-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.chip-list a { background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 5px 11px; font-size: 14px; color: #2b3947; }
.chip-list a:hover { border-color: var(--brand-2); text-decoration: none; }
.chip-list a .cd { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; color: var(--muted); margin-left: 5px; }

.note { background: #fbfcfe; border: 1px solid var(--line); border-left: 3px solid #c9d6e2; border-radius: 6px; padding: 12px 16px; font-size: 14px; color: #45535f; }
.muted { color: var(--muted); font-size: 13.5px; }

/* footer */
.site-foot { background: #0e2233; color: #a9bccd; padding: 26px 0 34px; font-size: 13.5px; }
.site-foot p { margin: 5px 0; }
.site-foot a { color: #7fc4e6; }
.site-foot .muted { color: #7e93a6; }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .head-inner { min-height: 56px; padding-top: 8px; padding-bottom: 8px; }
  .brand-text small { display: none; }
  .site-nav a { padding: 5px 9px; font-size: 14px; }
  .card { padding: 14px 16px; }
  h2 { margin-top: 26px; }
}