:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1d2433;
  --muted: #667085;
  --accent: #5b5ce2;
  --border: #e5e9f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 32px auto;
  padding: 48px 56px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 14px 40px rgba(29, 36, 51, 0.06);
}

h1 { margin: 0 0 8px; font-size: 32px; line-height: 1.3; }
h2 { margin: 34px 0 12px; font-size: 21px; line-height: 1.45; }
h3 { margin: 24px 0 8px; font-size: 17px; }
p, li { font-size: 15px; }
ul, ol { padding-left: 1.5em; }
a { color: var(--accent); overflow-wrap: anywhere; }

.meta {
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 14px;
}

.notice {
  padding: 14px 16px;
  background: #f1f1ff;
  border-left: 4px solid var(--accent);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

th, td {
  padding: 12px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th { background: #f8f9fc; }

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  main { margin: 0; width: 100%; padding: 28px 20px; border: 0; border-radius: 0; }
  h1 { font-size: 27px; }
  table { display: block; overflow-x: auto; }
}