:root {
  --bg: #f5f6fa;
  --card: #fff;
  --border: #e8ecf1;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo { font-size: 17px; font-weight: 700; color: var(--text); }
.site-logo:hover { text-decoration: none; }
.site-logo span { color: var(--primary); }
.site-nav { display: flex; gap: 18px; font-size: 14px; }
.site-nav a { color: var(--text-secondary); }
.site-nav a:hover, .site-nav a.active { color: var(--primary); text-decoration: none; }

/* 主体 */
.container { max-width: 960px; margin: 0 auto; padding: 24px 20px 48px; }
.hero { text-align: center; padding: 48px 0 32px; }
.hero h1 { font-size: 30px; font-weight: 800; letter-spacing: -.01em; }
.hero p { color: var(--text-secondary); font-size: 15px; margin-top: 10px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.card .sub { color: var(--text-secondary); font-size: 13px; margin-bottom: 16px; }

/* 工具卡列表 */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.tool-card:hover { border-color: var(--primary); box-shadow: 0 4px 16px rgba(79, 70, 229, .08); text-decoration: none; }
.tool-card .icon { font-size: 26px; }
.tool-card h3 { font-size: 16px; font-weight: 700; margin: 10px 0 6px; }
.tool-card p { font-size: 13px; color: var(--text-secondary); }
.tool-card .badge {
  display: inline-block; margin-top: 12px; font-size: 11px;
  padding: 2px 10px; border-radius: 10px;
  background: #eef2ff; color: var(--primary);
}
.tool-card .badge.soon { background: #f1f3f5; color: var(--text-secondary); }
.tool-card.disabled { opacity: .65; cursor: default; }
.tool-card.disabled:hover { border-color: var(--border); box-shadow: none; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; }
.field .hint { font-weight: 400; color: var(--text-secondary); font-size: 12px; }
.field input, .field select {
  width: 100%; padding: 9px 12px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 8px;
  outline: none; background: #fff; color: var(--text);
  transition: border-color .15s;
}
.field input:focus, .field select:focus { border-color: var(--primary); }
.field .unit { position: relative; }
.field .unit::after {
  content: attr(data-unit);
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font-size: 12px; color: var(--text-secondary); pointer-events: none;
}
.field .unit input { padding-right: 44px; }

.form-actions { display: flex; gap: 10px; margin-top: 18px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 9px 22px; font-size: 14px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--card);
  color: var(--text); cursor: pointer;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }

/* 结果区 */
.result { display: none; }
.result.show { display: block; }
.result-summary { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.score-ring {
  width: 120px; height: 120px; border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  flex-shrink: 0; border: 6px solid var(--primary);
}
.score-ring .num { font-size: 34px; font-weight: 800; line-height: 1; }
.score-ring .label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }
.score-ring.good { border-color: var(--success); }
.score-ring.mid { border-color: var(--warning); }
.score-ring.bad { border-color: var(--danger); }
.grade-text .grade { font-size: 22px; font-weight: 800; }
.grade-text .desc { font-size: 13px; color: var(--text-secondary); margin-top: 6px; max-width: 420px; }

.chart-box { position: relative; height: 320px; margin-top: 8px; }

table.result-table { width: 100%; border-collapse: collapse; margin-top: 4px; }
.result-table th, .result-table td { padding: 9px 10px; text-align: left; font-size: 13px; border-bottom: 1px solid var(--border); }
.result-table th { color: var(--text-secondary); font-weight: 600; font-size: 12px; background: #fafbfc; }
.result-table tr:last-child td { border-bottom: none; }
.result-table .dim-name { font-weight: 600; white-space: nowrap; }
.result-table .dim-score { font-weight: 700; white-space: nowrap; }
.tag { display: inline-block; font-size: 11px; padding: 2px 9px; border-radius: 10px; white-space: nowrap; }
.tag.good { background: #ecfdf5; color: #059669; }
.tag.mid { background: #fffbeb; color: #d97706; }
.tag.bad { background: #fef2f2; color: #dc2626; }
.advice-cell { color: var(--text-secondary); }

/* 说明文段 */
.prose h2 { font-size: 18px; font-weight: 700; margin: 22px 0 8px; }
.prose h3 { font-size: 15px; font-weight: 700; margin: 16px 0 6px; }
.prose p, .prose li { font-size: 14px; color: #374151; margin-bottom: 8px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose table { width: 100%; border-collapse: collapse; margin: 10px 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 7px 10px; font-size: 13px; text-align: left; }
.prose th { background: #fafbfc; }

/* 占位页 */
.placeholder { text-align: center; padding: 60px 20px; }
.placeholder .icon { font-size: 44px; }
.placeholder h1 { font-size: 24px; margin: 14px 0 8px; }
.placeholder p { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--text-secondary);
}

@media (max-width: 640px) {
  .site-header .inner { padding: 10px 14px; }
  .site-nav { gap: 12px; font-size: 13px; }
  .container { padding: 16px 12px 40px; }
  .hero { padding: 28px 0 20px; }
  .hero h1 { font-size: 23px; }
  .card { padding: 14px; border-radius: 10px; }
  .form-grid { grid-template-columns: 1fr; gap: 12px; }
  .field input, .field select { font-size: 16px; }
  .chart-box { height: 280px; }
  .result-summary { gap: 16px; }
  .result-table thead { display: none; }
  .result-table tr { display: block; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; margin-bottom: 8px; }
  .result-table td { display: flex; justify-content: space-between; gap: 12px; border: none; padding: 3px 0; }
  .result-table td::before { content: attr(data-label); color: var(--text-secondary); font-size: 11px; flex-shrink: 0; }
  .result-table .advice-cell { display: block; }
  .result-table .advice-cell::before { display: block; margin-bottom: 2px; }
  .btn { width: 100%; }
  .form-actions .btn { flex: 1; }
}