:root {
  --ink: #2a2140;
  --muted: #6b5d7a;
  --line: #ffb3c7;
  --paper: #ffe9d6;
  --card: #fff8f0;
  --navy: #3554d4;
  --seal: #ff3d73;
  --brass: #ffc53d;
  --ok: #12c48a;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--ink);
  line-height: 1.65;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, #ffd0e6 0%, transparent 34%),
    radial-gradient(circle at 92% 10%, #c8e4ff 0%, transparent 38%),
    radial-gradient(circle at 50% 100%, #ffe7a3 0%, transparent 30%),
    var(--paper);
}

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

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  background: linear-gradient(90deg, #3d4ea8, #5b8def);
  color: #fff8f2;
}
.top a { color: #fff8f2; text-decoration: none; }
.brand small {
  display: block;
  letter-spacing: 0.16em;
  font-size: 12px;
  opacity: 0.85;
}
.brand strong { font-size: 18px; }
.top nav { display: flex; gap: 16px; font-size: 14px; }

.wrap { max-width: 980px; margin: 0 auto; padding: 28px 20px 48px; }
.crumb { color: var(--muted); font-size: 14px; }
.kicker {
  margin: 0 0 8px;
  letter-spacing: 0.14em;
  font-size: 13px;
  color: var(--navy);
  font-weight: 700;
}
h1 { font-size: 30px; margin: 0 0 10px; line-height: 1.3; }
h2 { font-size: 22px; margin: 0 0 6px; }
h3 { font-size: 18px; margin: 0 0 6px; }
.hero p, .lead { color: var(--muted); max-width: 42em; }
.note {
  background: #fff3d6;
  border: 1px solid #ffd48a;
  border-radius: 12px;
  padding: 10px 14px;
  color: #6a4b12;
  font-size: 14px;
}

.projects { display: grid; gap: 22px; margin-top: 28px; }
.project {
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 20px;
  padding: 22px 22px 10px;
}
.project > header { margin-bottom: 8px; }
.project .lead { margin-top: 0; }
.cards { display: grid; gap: 14px; margin: 16px 0; }
@media (min-width: 720px) {
  .cards.three { grid-template-columns: repeat(3, 1fr); }
  .cards.two { grid-template-columns: repeat(2, 1fr); }
}

.card, .doc {
  display: block;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
  color: inherit;
  text-decoration: none;
}
a.card:hover, a.sub:hover { border-color: var(--navy); text-decoration: none; }
.card strong { display: block; color: var(--navy); font-size: 17px; margin-bottom: 6px; }
.card p, .sub p { margin: 0; color: var(--muted); font-size: 14px; }

.sub {
  display: block;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
  color: inherit;
}
.sub .tag {
  display: inline-block;
  background: #e4f1ff;
  color: var(--navy);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 8px;
}

.layer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 8px;
}
.layer-nav a {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--ink);
  font-size: 13px;
}
.layer-nav a:hover { border-color: var(--navy); color: var(--navy); text-decoration: none; }

.layer { margin: 28px 0; }
.layer header { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 12px; }
.layer .no {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--navy);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  flex: 0 0 auto;
}
.layer header p { margin: 0; color: var(--muted); }
.docs { display: grid; gap: 12px; }
@media (min-width: 720px) {
  .docs { grid-template-columns: repeat(2, 1fr); }
}

.doc-top { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.tag {
  display: inline-block;
  background: #e4f1ff;
  color: var(--navy);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
}
.tag.sample { background: #fff3d6; color: #8a5a10; }
.meta, .docno { margin: 0 0 6px; color: var(--muted); font-size: 13px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

.btn, .btn-line {
  display: inline-block;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.btn { background: var(--navy); color: #fff; }
.btn-line { background: #fff; color: var(--navy); border: 1.5px solid var(--navy); }
.btn:hover, .btn-line:hover { text-decoration: none; opacity: 0.92; }

.foot {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 8px 16px 28px;
}
.foot a { color: var(--muted); }