/* ============ ICD-10-CM Wiki · Apple 极简风 ============ */
:root {
  --text: #1d1d1f;
  --text-2: #6e6e73;
  --text-3: #86868b;
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-card: #fbfbfd;
  --border: #d2d2d7;
  --border-soft: #e8e8ed;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --green: #34c759;
  --orange: #ff9500;
  --red: #ff3b30;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 12px rgba(0,0,0,0.04);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 17px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.47;
  letter-spacing: -0.01em;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 22px; }

/* ===== Header ===== */
.site-header {
  background: rgba(255,255,255,0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 14px; padding-bottom: 14px; }
.site-header .logo { font-size: 21px; font-weight: 600; color: var(--text); letter-spacing: -0.02em; font-family: "SF Mono", "Courier New", monospace; }
.site-header .logo:hover { text-decoration: none; }
.site-nav { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.site-nav a { font-size: 14px; color: var(--text-2); text-decoration: none; padding: 6px 12px; border-radius: 980px; transition: all 0.2s; }
.site-nav a:hover { color: var(--accent); background: rgba(0,113,227,0.08); text-decoration: none; }
.site-nav a.nav-active { color: #fff; background: var(--accent); font-weight: 500; }

/* ===== Main ===== */
main.container { padding: 32px 22px 80px; min-height: calc(100vh - 200px); }

/* ===== Hero / Search ===== */
.hero { text-align: center; padding: 40px 0 32px; }
.hero-title { font-size: 48px; font-weight: 600; letter-spacing: -0.03em; color: var(--text); margin-bottom: 10px; line-height: 1.1; }
.hero-sub { font-size: 19px; color: var(--text-2); margin-bottom: 28px; max-width: 720px; margin-left: auto; margin-right: auto; }
.search-box { max-width: 560px; margin: 0 auto; display: flex; gap: 8px; }
.search-box input { flex: 1; padding: 14px 20px; font-size: 17px; border: 1px solid var(--border); border-radius: 980px; outline: none; background: var(--bg-alt); color: var(--text); transition: all 0.2s; }
.search-box input:focus { background: #fff; border-color: var(--accent); box-shadow: 0 0 0 4px rgba(0,113,227,0.1); }
.search-box button { padding: 0 22px; background: var(--accent); color: #fff; border: none; border-radius: 980px; font-size: 17px; cursor: pointer; transition: background 0.2s; }
.search-box button:hover { background: var(--accent-hover); }

/* ===== Home sections ===== */
.home-section { margin-top: 56px; }
.home-section h2 { font-size: 22px; font-weight: 600; margin-bottom: 4px; letter-spacing: -0.02em; color: var(--text); }
.section-hint { font-size: 14px; color: var(--text-3); font-weight: 400; margin-left: 8px; }
.section-desc { font-size: 16px; color: var(--text-2); line-height: 1.6; margin-top: 12px; }
.section-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; margin-top: 18px; }
.section-card { background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 18px 20px; text-decoration: none; color: var(--text); transition: all 0.25s ease; display: flex; flex-direction: column; gap: 6px; }
.section-card:hover { background: #fff; border-color: var(--border); box-shadow: var(--shadow-hover); transform: translateY(-2px); text-decoration: none; }
.section-card .section-code { font-size: 12px; color: var(--text-3); font-weight: 500; letter-spacing: 0.02em; font-family: "SF Mono", monospace; }
.section-card .section-name { font-size: 15px; font-weight: 500; color: var(--text); line-height: 1.3; }
.section-card .section-count { font-size: 12px; color: var(--text-3); margin-top: 4px; }

/* ===== Chapter grid ===== */
.chapter-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px; margin-top: 20px; }
.chapter-item { display: flex; align-items: flex-start; gap: 12px; padding: 14px 18px; background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: var(--radius); text-decoration: none; color: var(--text); font-size: 14px; line-height: 1.4; transition: all 0.2s; }
.chapter-item:hover { background: #fff; border-color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.chapter-item .chapter-code { font-family: "SF Mono", "Courier New", monospace; font-weight: 600; color: var(--accent); flex-shrink: 0; font-size: 13px; }
.chapter-item .chapter-name { color: var(--text-2); font-size: 14px; line-height: 1.4; }

/* ===== Breadcrumb ===== */
.breadcrumb { font-size: 13px; color: var(--text-3); margin-bottom: 28px; padding: 8px 0; }
.breadcrumb a { color: var(--accent); }
.breadcrumb .sep { margin: 0 6px; color: var(--text-3); }

/* ===== Detail page ===== */
.detail-wrap { max-width: 860px; margin: 0 auto; }
.code-header { text-align: center; padding: 28px 0 32px; }
.code-big { display: inline-block; font-family: "SF Mono", "Courier New", monospace; font-size: 40px; font-weight: 500; color: var(--text); letter-spacing: -0.02em; line-height: 1; }
.code-header h1 { font-size: 28px; font-weight: 600; margin: 14px 0 6px; color: var(--text); letter-spacing: -0.02em; }
.status-tag { display: inline-block; font-size: 12px; padding: 3px 10px; border-radius: 980px; font-weight: 500; margin-left: 6px; vertical-align: middle; }
.update-time { display: inline-block; font-size: 12px; color: var(--text-3); margin-left: 10px; vertical-align: middle; }

.info-section { margin-bottom: 16px; background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 22px 26px; }
.info-section:hover { border-color: var(--border); }
.section-title { font-size: 17px; font-weight: 600; margin: 0 0 18px 0; color: var(--text); letter-spacing: -0.01em; }
.kv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px 20px; }
.kv-item { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; background: #fff; border-radius: var(--radius-sm); font-size: 14px; border: 1px solid var(--border-soft); }
.kv-k { color: var(--text-3); font-size: 13px; }
.kv-v { color: var(--text); font-weight: 500; text-align: right; word-break: break-word; }
.kv-v.code { font-family: "SF Mono", "Courier New", monospace; font-size: 13px; }

/* ===== Section page ===== */
.section-page h1 { font-size: 32px; font-weight: 600; letter-spacing: -0.02em; margin-bottom: 6px; }
.section-page .section-desc { font-size: 17px; color: var(--text-2); margin-bottom: 32px; }

/* ===== Search results ===== */
.search-meta { font-size: 13px; color: var(--text-3); margin: 24px 0 16px; }
.result-card { display: block; padding: 18px 22px; background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: var(--radius); margin-bottom: 8px; text-decoration: none; color: var(--text); transition: all 0.2s; }
.result-card:hover { background: #fff; border-color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.result-card .r-code { font-family: "SF Mono", "Courier New", monospace; font-size: 17px; font-weight: 500; color: var(--accent); margin-bottom: 4px; display: block; }
.result-card .r-name { font-size: 16px; font-weight: 500; color: var(--text); margin-bottom: 6px; display: block; }
.result-card .r-meta { font-size: 13px; color: var(--text-3); display: block; }
.result-card .r-meta strong { color: var(--text-2); font-weight: 500; margin-right: 14px; }

.empty-box { margin-top: 20px; padding: 22px 26px; background: var(--bg-card); border: 1px solid var(--border-soft); border-radius: var(--radius); color: var(--text-2); font-size: 15px; line-height: 1.8; }
.empty-box ul { padding-left: 22px; }

/* ===== Footer ===== */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border-soft); padding: 28px 0; text-align: center; color: var(--text-3); font-size: 13px; }
.footer-sub { margin-top: 4px; font-size: 12px; color: var(--text-3); }

/* ===== Responsive ===== */
@media (max-width: 734px) {
  .hero-title { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .code-big { font-size: 28px; }
  .code-header h1 { font-size: 20px; }
  .info-section { padding: 18px 20px; }
  .kv-grid { grid-template-columns: 1fr; }
  .section-grid { grid-template-columns: 1fr; }
}