/* 协议页共用样式：以可读性为第一目标，不做花哨动效 */
:root {
  --ink: #16221C;
  --ink2: #4A5A53;
  --ink3: #7A8A83;
  --line: #E4EBE7;
  --brand: #0E9F6E;
  --bg: #FFFFFF;
  --soft: #F6FAF8;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.top-in {
  max-width: 780px; margin: 0 auto; padding: 12px 22px;
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--ink3);
}
.top-in b { color: var(--ink); font-size: 14px; font-weight: 650; }
.top-in .sp { flex: 1; }

main { max-width: 780px; margin: 0 auto; padding: 34px 22px 72px; }

h1 { font-size: 26px; letter-spacing: -.6px; margin: 6px 0 6px; font-weight: 740; }
.meta {
  font-size: 12.5px; color: var(--ink3);
  padding-bottom: 20px; border-bottom: 1px solid var(--line); margin-bottom: 26px;
}
.meta span + span::before { content: "·"; margin: 0 8px; color: #C8D4CE; }

h2 {
  font-size: 17px; font-weight: 700; margin: 32px 0 10px;
  letter-spacing: -.2px;
}
h3 { font-size: 15px; font-weight: 650; margin: 20px 0 6px; color: var(--ink); }
p { margin: 0 0 12px; color: var(--ink2); }
ol, ul { margin: 0 0 14px; padding-left: 22px; color: var(--ink2); }
li { margin-bottom: 7px; }
li > ul, li > ol { margin-top: 7px; }
strong { color: var(--ink); font-weight: 650; }

table { width: 100%; border-collapse: collapse; margin: 6px 0 16px; font-size: 13.5px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink3); font-weight: 600; font-size: 12.5px; background: var(--soft); }

.note {
  background: var(--soft); border-left: 3px solid var(--brand);
  padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 0 0 18px;
  font-size: 13.5px; color: var(--ink2);
}
.note p:last-child { margin-bottom: 0; }

.toc { background: var(--soft); border-radius: 12px; padding: 16px 20px; margin-bottom: 8px; }
.toc div { font-size: 12.5px; color: var(--ink3); margin-bottom: 8px; letter-spacing: .4px; }
.toc a { display: inline-block; margin: 0 14px 4px 0; font-size: 13.5px; }

footer.doc {
  max-width: 780px; margin: 0 auto; padding: 22px 22px 60px;
  border-top: 1px solid var(--line);
  font-size: 12.5px; color: var(--ink3); line-height: 1.9;
}
footer.doc b { color: var(--ink2); font-weight: 600; }

@media (max-width: 520px) {
  body { font-size: 14.5px; }
  h1 { font-size: 22px; }
  main { padding: 26px 18px 56px; }
  .top-in { padding: 11px 18px; }
}