* { scrollbar-width: thin; scrollbar-color: #334155 #0f172a; }
    ::-webkit-scrollbar { width: 8px; }
    ::-webkit-scrollbar-track { background: #0f172a; }
    ::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }
    body { font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; }
    .glass { background: rgba(30,41,59,0.7); backdrop-filter: blur(12px); border: 1px solid rgba(255,255,255,0.08); }
    .glow-text { text-shadow: 0 0 30px rgba(14,165,233,0.4); }
    .score-ring { transition: stroke-dashoffset 1s ease-in-out; }
    .tab-active { border-bottom: 2px solid #0ea5e9; color: #0ea5e9; }
    .data-row:hover { background: rgba(14,165,233,0.05); }
    @keyframes pulse-slow {
      0%,100% { opacity: 1; }
      50% { opacity: 0.6; }
    }
    .animate-pulse-slow { animation: pulse-slow 3s infinite; }
    @keyframes slideUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .slide-up { animation: slideUp 0.5s ease-out forwards; }
    #map { height: 320px; border-radius: 12px; }
    .risk-low { color: #22c55e; }
    .risk-medium { color: #f59e0b; }
    .risk-high { color: #ef4444; }
    .progress-bg { background: #334155; border-radius: 999px; overflow: hidden; }
    .progress-fill { height: 100%; border-radius: 999px; transition: width 1s ease; }
    .help-popover {
      position: relative;
      display: inline-flex;
      align-items: center;
      vertical-align: middle;
      color: #94a3b8;
    }
    .help-popover summary {
      width: 1.1rem;
      height: 1.1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid #475569;
      border-radius: 999px;
      background: rgba(15, 23, 42, 0.75);
      color: #bae6fd;
      cursor: pointer;
      font-size: 0.72rem;
      font-weight: 700;
      line-height: 1;
      list-style: none;
    }
    .help-popover summary::-webkit-details-marker { display: none; }
    .help-popover__content {
      display: none;
      position: absolute;
      left: 0;
      top: calc(100% + 0.5rem);
      z-index: 80;
      width: min(18rem, calc(100vw - 2rem));
      padding: 0.75rem;
      border: 1px solid rgba(14, 165, 233, 0.35);
      border-radius: 0.5rem;
      background: #020617;
      box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
      color: #cbd5e1;
      text-align: left;
    }
    .help-popover__content strong {
      display: block;
      margin-bottom: 0.25rem;
      color: #f8fafc;
      font-size: 0.82rem;
    }
    .help-popover__content p {
      margin: 0 0 0.5rem;
      font-size: 0.78rem;
      line-height: 1.5;
    }
    .help-popover__content a,
    .faq-related a,
    .faq-toc a {
      color: #38bdf8;
      text-decoration: none;
    }
    .help-popover__content a:hover,
    .faq-related a:hover,
    .faq-toc a:hover {
      text-decoration: underline;
    }
    .help-popover[open] .help-popover__content,
    .help-popover:hover .help-popover__content,
    .help-popover:focus-within .help-popover__content {
      display: block;
    }
    .faq-article section:target {
      border-color: rgba(14, 165, 233, 0.65);
      box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.2);
    }
    .faq-toc {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .faq-toc a {
      display: inline-flex;
      align-items: center;
      min-height: 2rem;
      padding: 0.35rem 0.65rem;
      border: 1px solid #334155;
      border-radius: 0.5rem;
      background: rgba(15, 23, 42, 0.75);
      color: #cbd5e1;
      font-size: 0.82rem;
    }
    .faq-section-title {
      margin-bottom: 0.75rem;
      color: #f8fafc;
      font-size: 1.1rem;
      font-weight: 700;
    }
    .faq-article p {
      color: #cbd5e1;
      font-size: 0.92rem;
      line-height: 1.8;
    }
    .faq-related {
      margin-top: 0.75rem;
      font-size: 0.86rem;
    }
    .faq-table {
      width: 100%;
      min-width: 44rem;
      border-collapse: collapse;
      font-size: 0.86rem;
    }
    .faq-table th,
    .faq-table td {
      padding: 0.75rem;
      border-bottom: 1px solid #334155;
      text-align: left;
      vertical-align: top;
    }
    .faq-table th {
      color: #e2e8f0;
      background: rgba(15, 23, 42, 0.9);
    }
    .faq-table td {
      color: #cbd5e1;
    }
    /* 可访问性：键盘焦点轮廓 */
    button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible, [role="tab"]:focus-visible {
      outline: 3px solid #0ea5e9;
      outline-offset: 2px;
      border-radius: 4px;
    }
    /* 可访问性：屏幕阅读器专用隐藏文本 */
    .sr-only {
      position: absolute;
      width: 1px; height: 1px;
      padding: 0; margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }