:root {
  --fg: #1f1f1f;
  --muted: #787774;
  --line: #e9e9e7;
  --bg: #ffffff;
  --soft: #f7f7f5;
  --accent: #1f1f1f;
  --case: #2f5d50;
  --case-soft: #eef4f1;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--fg); background: var(--bg); line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* 顶部 */
.top { border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 600; font-size: 15px; letter-spacing: .2px; }
.brand span { color: var(--muted); font-weight: 400; margin-left: 6px; }
.top-link { font-size: 13px; color: var(--muted); }
.top-link:hover { color: var(--fg); }

.hero { padding: 48px 0 24px; }
.hero h1 { font-size: 32px; margin: 0 0 8px; font-weight: 700; letter-spacing: -.5px; }
.hero p { margin: 0; color: var(--muted); font-size: 15px; }

/* 分区切换 */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-top: 28px; }
.tab {
  padding: 10px 16px; font-size: 15px; color: var(--muted); cursor: pointer;
  border: none; background: none; border-bottom: 2px solid transparent; margin-bottom: -1px; font-family: inherit;
}
.tab b { font-weight: 500; }
.tab .n { font-size: 12px; margin-left: 6px; background: var(--soft); padding: 1px 7px; border-radius: 10px; }
.tab.on { color: var(--fg); border-bottom-color: var(--fg); }
.tab.case.on { color: var(--case); border-bottom-color: var(--case); }

.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 20px 0 8px; }
.search {
  flex: 1 1 220px; max-width: 320px; padding: 8px 12px; font-size: 14px; font-family: inherit;
  border: 1px solid var(--line); border-radius: 6px; outline: none; background: var(--soft);
}
.search:focus { border-color: #c7c7c5; background: #fff; }
.chip {
  font-size: 13px; padding: 5px 12px; border-radius: 16px; border: 1px solid var(--line);
  background: #fff; cursor: pointer; color: var(--muted); font-family: inherit;
}
.chip.on { background: var(--fg); color: #fff; border-color: var(--fg); }

.group-title { font-size: 13px; color: var(--muted); font-weight: 500; margin: 28px 0 12px; letter-spacing: .5px; }

/* 卡片 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.card { display: block; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; transition: box-shadow .15s, transform .15s; background: #fff; }
.card:hover { box-shadow: 0 6px 20px rgba(0,0,0,.07); transform: translateY(-2px); }
.card .cover { aspect-ratio: 16 / 9; background: var(--soft); border-bottom: 1px solid var(--line); overflow: hidden; }
.card .cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card .body { padding: 12px 14px 14px; }
.card h3 { font-size: 15px; margin: 0 0 6px; font-weight: 600; line-height: 1.45; }
.card .meta { font-size: 12px; color: var(--muted); }

/* 病历资料分区 */
.case-intro {
  margin-top: 20px; padding: 16px 18px; background: var(--case-soft); border-radius: 8px;
  color: var(--case); font-size: 14px;
}
.case-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; margin-top: 20px; }
.case-item { display: flex; gap: 14px; align-items: center; padding: 12px; border: 1px solid var(--line); border-radius: 8px; transition: border-color .15s, background .15s; }
.case-item:hover { border-color: var(--case); background: var(--case-soft); }
.case-item .no { flex: none; width: 34px; height: 34px; border-radius: 50%; background: var(--case); color: #fff; display: grid; place-items: center; font-size: 14px; font-weight: 600; }
.case-item img { flex: none; width: 112px; aspect-ratio: 16/9; object-fit: cover; border-radius: 4px; border: 1px solid var(--line); }
.case-item h3 { margin: 0; font-size: 15px; font-weight: 600; }
.case-item .meta { font-size: 12px; color: var(--muted); }

.empty { color: var(--muted); padding: 40px 0; text-align: center; }

footer { margin-top: 64px; border-top: 1px solid var(--line); padding: 24px 0 40px; font-size: 12px; color: var(--muted); text-align: center; line-height: 1.9; }
footer .icp:hover { color: var(--fg); text-decoration: underline; }

/* 阅读页 */
.vbar { position: sticky; top: 0; z-index: 5; background: rgba(255,255,255,.94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.vbar .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
.vbar .back { font-size: 14px; color: var(--muted); white-space: nowrap; }
.vbar .back:hover { color: var(--fg); }
.vbar .t { flex: 1; min-width: 0; font-size: 15px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vbar .pg { font-size: 13px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.btn { font-size: 13px; padding: 6px 12px; border-radius: 6px; border: 1px solid var(--fg); background: var(--fg); color: #fff; white-space: nowrap; }
.btn:hover { opacity: .85; }
.slides { max-width: 1040px; margin: 24px auto; padding: 0 16px; }
.slide { margin: 0 0 18px; background: var(--soft); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; aspect-ratio: 16 / 9; }
.slide img { width: 100%; height: 100%; object-fit: contain; display: block; background: #fff; }
.vhead { max-width: 1040px; margin: 28px auto 0; padding: 0 16px; }
.vhead h1 { font-size: 22px; margin: 0 0 4px; }
.vhead p { margin: 0; color: var(--muted); font-size: 13px; }

@media (max-width: 640px) {
  .hero { padding: 32px 0 12px; }
  .hero h1 { font-size: 24px; }
  .brand span { display: none; }
  .grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .card h3 { font-size: 14px; }
  .case-list { grid-template-columns: 1fr; }
  .case-item img { width: 88px; }
  .vbar .back span { display: none; }
  .slides { padding: 0 8px; margin-top: 12px; }
  .slide { margin-bottom: 10px; }
}