/* 第3套 zh · 长栏杂志 · 先办公说明再下载 */
:root {
  --ink: #222;
  --teal: #0a6b66;
  --paper: #fbf8f1;
  --rule: #ddd4c2;
  --muted: #5d574c;
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --sans: "Microsoft YaHei", "PingFang SC", sans-serif;
  --col: 740px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.9;
}
a { color: var(--teal); }
.mast {
  background: #fff;
  border-bottom: 1px solid var(--ink);
  position: sticky; top: 0; z-index: 10;
}
.mast__in {
  width: min(920px, calc(100% - 28px));
  margin: 0 auto;
  padding: 14px 0;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.brand {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--ink);
  font-family: var(--serif); font-size: 22px; font-weight: 700;
}
.brand svg { width: 26px; height: 26px; color: var(--teal); }
.nav { display: flex; gap: 14px; align-items: center; }
.nav a {
  color: var(--ink); text-decoration: none;
  border-bottom: 1px solid transparent; padding-bottom: 2px;
  display: inline-flex; align-items: center; gap: 5px;
}
.nav a svg { width: 14px; height: 14px; }
.nav a[aria-current="page"] { border-bottom-color: var(--ink); font-weight: 700; }
.nav .top-dl {
  border: 1px solid var(--teal); color: #fff; background: var(--teal);
  padding: 6px 10px; text-decoration: none; font-size: 13px; font-weight: 700;
}
.folio { width: min(var(--col), calc(100% - 28px)); margin: 0 auto; padding: 32px 0 56px; }
.kicker { color: var(--teal); letter-spacing: 0.14em; font-size: 12px; margin: 0 0 8px; }
h1, h2, h3 { font-family: var(--serif); }
h1 { font-size: 34px; line-height: 1.35; margin: 0 0 16px; }
h2 { font-size: 26px; margin: 0 0 10px; }
h3 { font-size: 19px; margin: 18px 0 8px; }
.chapter { margin: 36px 0; padding-top: 16px; border-top: 1px solid var(--rule); }
blockquote.pull {
  margin: 18px 0;
  padding: 0 0 0 16px;
  border-left: 3px solid var(--teal);
  font-family: var(--serif);
  font-size: 20px;
}
.letter { background: #fff; border: 1px solid var(--rule); padding: 14px 16px; margin: 0 0 12px; }
.letter footer { font-size: 13px; color: var(--muted); }
table.plain { width: 100%; border-collapse: collapse; font-size: 15px; }
table.plain th, table.plain td { border-bottom: 1px solid var(--rule); padding: 9px 6px; text-align: left; vertical-align: top; }
.faq details { border-bottom: 1px solid var(--rule); padding: 6px 0; }
.faq summary { cursor: pointer; font-weight: 700; padding: 8px 0; }
.dl-box { background: #fff; border: 1px solid var(--ink); padding: 18px 18px 8px; margin: 16px 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.btn, .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 42px; padding: 0 14px;
  text-decoration: none; font-weight: 700;
  border: 1px solid var(--ink);
  transition: background 0.15s ease;
}
.btn { background: var(--teal); color: #fff; border-color: var(--teal); }
.btn:hover { background: #084844; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: #efe8d6; }
.btn svg, .btn-ghost svg { width: 16px; height: 16px; }
.colophon {
  width: min(920px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 36px;
  border-top: 2px solid var(--ink);
  font-size: 13px; color: var(--muted);
}
@media (max-width: 720px) {
  h1 { font-size: 26px; }
  .mast__in { flex-wrap: wrap; }
}