:root {
  --ink: #14181f;
  --muted: #5c6472;
  --line: #e3e7ee;
  --bg: #f6f7f9;
  --card: #ffffff;
  --accent: #185fa5;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 820px; margin: 0 auto; padding: 64px 24px 48px; }

.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.brand svg { flex: none; }
.brand span { font-size: 13px; color: var(--muted); letter-spacing: .1em; }

h1 { font-size: 30px; line-height: 1.35; font-weight: 600; letter-spacing: .01em; margin: 0 0 14px; }
h2 { font-size: 19px; font-weight: 600; margin: 42px 0 12px; }
h3 { font-size: 15px; font-weight: 600; margin: 0 0 6px; }
p { margin: 0 0 14px; }

.lede { font-size: 17px; color: var(--muted); margin: 0; max-width: 38em; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 40px 0 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px 18px; }
.card p { margin: 0; font-size: 14px; line-height: 1.65; color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 38px; }
.btn {
  display: inline-block; padding: 10px 18px; border: 1px solid var(--line);
  border-radius: 8px; background: var(--card); color: var(--ink);
  font-size: 14px; line-height: 1.4;
}
.btn:hover { text-decoration: none; border-color: #c9d0da; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #134d87; }

.hint { font-size: 14px; color: var(--muted); }
.warn { color: #b45309; }

.doc { margin-top: 4px; }
.doc h2 { font-size: 17px; margin: 32px 0 10px; }
.doc ul { margin: 0 0 14px; padding-left: 22px; }
.doc li { margin: 0 0 8px; font-size: 15px; line-height: 1.7; }
.doc .updated { font-size: 13px; color: var(--muted); margin-top: 36px; }
.doc .back { font-size: 14px; }

table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 0 0 16px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: #eef1f5; font-weight: 600; }

footer {
  max-width: 820px; margin: 0 auto; padding: 28px 24px 60px;
  border-top: 1px solid var(--line); font-size: 13px; color: var(--muted);
}
footer .meta { margin: 0 0 6px; }
footer a { color: var(--muted); }

@media (max-width: 680px) {
  .wrap { padding: 44px 20px 32px; }
  h1 { font-size: 24px; }
  .cards { grid-template-columns: 1fr; }
  footer { padding: 24px 20px 48px; }
}