*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    body {
      font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
      background: #f8fafc;
      color: #1e293b;
      line-height: 1.8;
    }
    a { text-decoration: none; color: inherit; }

    /* ===== NAVBAR ===== */
    .navbar {
      background: #fff;
      border-bottom: 1px solid #e8edf3;
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .nav-inner {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo { display: flex; align-items: center; gap: 4px; }
    .logo-icon {
      background: linear-gradient(135deg, #1a56db, #3b82f6);
      color: #fff;
      font-weight: 700;
      font-size: 16px;
      padding: 4px 8px;
      border-radius: 6px;
    }
    .logo-text { font-size: 17px; font-weight: 600; color: #1e293b; }
    .nav-links { display: flex; gap: 28px; font-size: 16px; color: #475569; }
    .nav-links a:hover { color: #1a56db; }
    .btn-nav {
      background: #1a56db;
      color: #fff;
      padding: 8px 20px;
      border-radius: 8px;
      font-size: 14px;
      transition: background .2s;
    }
    .btn-nav:hover { background: #1447c0; }

    /* ===== HERO ===== */
    .page-hero {
      background: linear-gradient(135deg, #1e3a8a, #1a56db);
      color: #fff;
      padding: 56px 24px 48px;
      text-align: center;
    }
    .page-hero h1 { font-size: 32px; font-weight: 700; margin-bottom: 10px; }
    .page-hero p  { font-size: 14px; opacity: .8; }
    .hero-search {
      max-width: 480px;
      margin: 24px auto 0;
      position: relative;
    }
    .hero-search input {
      width: 100%;
      padding: 12px 20px 12px 44px;
      border: none;
      border-radius: 50px;
      font-size: 14px;
      font-family: inherit;
      outline: none;
      box-shadow: 0 4px 16px rgba(0,0,0,.15);
    }
    .hero-search .search-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      font-size: 18px;
      opacity: .5;
    }

    /* ===== SECTION ===== */
    .section { padding: 56px 24px; }
    .container { max-width: 960px; margin: 0 auto; }
    .section-title {
      font-size: 26px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 8px;
    }
    .section-sub {
      text-align: center;
      color: #64748b;
      font-size: 14px;
      margin-bottom: 40px;
    }

    /* ===== CATEGORY TABS ===== */
    .faq-tabs {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .faq-tab {
      padding: 8px 20px;
      border-radius: 50px;
      font-size: 14px;
      border: 1px solid #d1d9e6;
      background: #fff;
      color: #475569;
      cursor: pointer;
      transition: all .2s;
    }
    .faq-tab:hover { border-color: #1a56db; color: #1a56db; }
    .faq-tab.active {
      background: #1a56db;
      color: #fff;
      border-color: #1a56db;
    }

    /* ===== FAQ LIST ===== */
    .faq-group { margin-bottom: 16px; }
    .faq-group-title {
      font-size: 15px;
      font-weight: 700;
      color: #1a56db;
      margin-bottom: 12px;
      padding-left: 12px;
      border-left: 3px solid #1a56db;
    }

    .faq-item {
      background: #fff;
      border: 1px solid #e8edf3;
      border-radius: 12px;
      margin-bottom: 10px;
      overflow: hidden;
      transition: border-color .2s, box-shadow .2s;
    }
    .faq-item:hover { border-color: #bfdbfe; }
    .faq-item.open { border-color: #1a56db; box-shadow: 0 4px 16px rgba(26,86,219,.08); }

    .faq-q {
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      gap: 12px;
    }
    .faq-q .q-text {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
      font-weight: 600;
      color: #1e293b;
      flex: 1;
    }
    .faq-q .q-num {
      background: #eff6ff;
      color: #1a56db;
      font-size: 12px;
      font-weight: 700;
      width: 24px; height: 24px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .faq-item.open .q-num { background: #1a56db; color: #fff; }
    .faq-q .arrow {
      font-size: 18px;
      color: #94a3b8;
      transition: transform .25s;
      flex-shrink: 0;
    }
    .faq-item.open .arrow { transform: rotate(180deg); color: #1a56db; }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height .3s ease;
    }
    .faq-item.open .faq-a { max-height: 600px; }
    .faq-a-inner {
      padding: 0 20px 20px 54px;
      font-size: 14px;
      color: #475569;
      line-height: 1.8;
    }
    .faq-a-inner p { margin-bottom: 8px; }
    .faq-a-inner p:last-child { margin-bottom: 0; }
    .faq-a-inner ul {
      padding-left: 18px;
      margin-bottom: 8px;
    }
    .faq-a-inner li { margin-bottom: 4px; }

    /* 答案中的高亮 */
    .highlight { color: #1a56db; font-weight: 600; }
    .price-tag {
      background: #fff7ed;
      color: #ea580c;
      font-weight: 600;
      padding: 1px 6px;
      border-radius: 4px;
      font-size: 13px;
    }

    /* ===== HOT TOPICS ===== */
    .hot-section { background: #fff; }
    .hot-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .hot-card {
      border: 1px solid #e8edf3;
      border-radius: 12px;
      padding: 20px;
      cursor: pointer;
      transition: all .2s;
    }
    .hot-card:hover { border-color: #1a56db; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(26,86,219,.08); }
    .hot-card .hc-icon { font-size: 28px; margin-bottom: 8px; }
    .hot-card h4 { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
    .hot-card p { font-size: 12px; color: #64748b; }

    /* ===== NO RESULT ===== */
    .no-result {
      text-align: center;
      padding: 48px 20px;
      display: none;
    }
    .no-result.show { display: block; }
    .no-result .nr-icon { font-size: 48px; margin-bottom: 14px; }
    .no-result h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
    .no-result p { font-size: 14px; color: #64748b; margin-bottom: 20px; }
    .no-result .btn-primary {
      background: #1a56db;
      color: #fff;
      padding: 10px 28px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      border: none;
      cursor: pointer;
    }

    /* ===== ASK US ===== */
    .ask-section {
      background: linear-gradient(135deg, #eff6ff, #dbeafe);
      border: 1px solid #bfdbfe;
      border-radius: 16px;
      padding: 40px;
      text-align: center;
    }
    .ask-section h2 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
    .ask-section p  { font-size: 14px; color: #64748b; margin-bottom: 24px; }
    .ask-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
    .ask-btn {
      background: #1a56db;
      color: #fff;
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background .2s;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .ask-btn:hover { background: #1447c0; }
    .ask-btn.outline {
      background: #fff;
      color: #1a56db;
      border: 2px solid #1a56db;
    }
    .ask-btn.outline:hover { background: #1a56db; color: #fff; }

    /* ===== FOOTER ===== */
    footer {
      background: #0f172a;
      color: #94a3b8;
      text-align: center;
      padding: 28px 24px;
      font-size: 13px;
    }
    footer a { color: #64748b; }
    footer a:hover { color: #fff; }

    /* ===== FLOAT ===== */
    .float-btns {
      position: fixed;
      right: 20px; bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 200;
    }
    .float-btn {
      width: 46px; height: 46px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(0,0,0,.15);
      cursor: pointer;
      border: none;
      transition: transform .2s;
    }
    .float-btn:hover { transform: scale(1.1); }
    .float-btn.phone { background: #16a34a; color: #fff; }
    .float-btn.top   { background: #fff; color: #475569; border: 1px solid #e8edf3; }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hot-grid { grid-template-columns: 1fr; }
      .ask-section { padding: 28px 20px; }
      .page-hero h1 { font-size: 24px; }
    }
    @media (max-width: 480px) {
      .faq-tabs { gap: 6px; }
      .faq-tab { padding: 6px 14px; font-size: 13px; }
    }