:root {
  --ink: #1c1c1e;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #4a6fa5;
  --bg: #ffffff;
  --soft: #f5f5f7;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
header.site {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}
.brand {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 6px;
  text-decoration: none;
  color: var(--ink);
}
nav { margin-top: 6px; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-right: 22px;
  font-size: 15px;
}
nav a:hover { color: var(--ink); }
.hero { padding: 72px 0 48px; }
.hero h1 {
  font-size: 34px;
  line-height: 1.4;
  margin: 0 0 16px;
  font-weight: 700;
}
.hero p { color: var(--muted); font-size: 17px; margin: 0 0 28px; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 16px;
}
.btn:hover { background: #000; }
section.block { padding: 36px 0; }
section.block h2 { font-size: 22px; margin: 0 0 18px; }
table.docs {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
table.docs th, table.docs td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.docs th { color: var(--muted); font-weight: 500; font-size: 13px; }
table.docs a { color: var(--accent); text-decoration: none; }
table.docs a:hover { text-decoration: underline; }
.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--muted);
  background: var(--soft);
  border-radius: 4px;
  padding: 2px 8px;
  margin-right: 6px;
}
.note {
  background: var(--soft);
  border-radius: 8px;
  padding: 16px 18px;
  font-size: 14px;
  color: var(--muted);
  margin: 28px 0;
}
footer.site {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}
footer.site a { color: var(--muted); }
img.preview {
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 12px 0;
}

/* ---------- 移动端适配 ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.doc-actions { display: flex; flex-direction: column; gap: 10px; }
a.action-btn {
  display: block;
  text-align: center;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 18px;
  font-size: 15px;
  background: #fff;
  min-width: 130px;
}
a.action-btn:active { background: var(--soft); }

/* ---------- 图片画廊 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 230px));
  justify-content: center;
  gap: 20px;
  margin: 10px 0 6px;
}
.gallery.small {
  grid-template-columns: repeat(4, minmax(0, 150px));
  justify-content: center;
}
.gallery figure { margin: 0; }
.gallery img {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--line); border-radius: 8px; background: #fff;
}
.gallery figcaption { font-size: 14px; color: var(--ink); margin-top: 8px; text-align: center; }
.gallery figcaption span { color: var(--muted); font-size: 13px; }
.gallery figcaption a { color: var(--accent); text-decoration: none; font-size: 13px; }

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .brand { font-size: 22px; letter-spacing: 4px; }
  nav a {
    display: inline-block;
    margin-right: 14px;
    padding: 8px 2px;
    font-size: 15px;
  }
  .hero { padding: 44px 0 30px; }
  .hero h1 { font-size: 25px; }
  .hero p { font-size: 15px; }
  .btn {
    display: block;
    text-align: center;
    padding: 14px 20px;
    font-size: 16px;
  }
  section.block h2 { font-size: 19px; }
  table.docs { min-width: 600px; font-size: 14px; }
  table.docs th, table.docs td { padding: 10px 8px; }
  .preview-bar { flex-direction: column; align-items: stretch; }
  .preview-bar h2 { font-size: 17px; }
  figure.page { margin-bottom: 14px; }
  .gallery { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .gallery.small { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}