:root {
      --primary: #4f46e5;
      --secondary: #06b6d4;
      --accent: #ec4899;
      --rainbow-1: #ef4444;
      --rainbow-2: #f97316;
      --rainbow-3: #eab308;
      --rainbow-4: #10b981;
      --rainbow-5: #06b6d4;
      --rainbow-6: #6366f1;
      --rainbow-7: #a855f7;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px -4px rgba(15,23,42,0.08);
      --shadow-rainbow: 0 10px 30px -8px rgba(79,70,229,0.18);
      --radius-lg: 16px;
      --radius-md: 10px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      padding: 0 20px;
      margin: 0 auto;
    }

    header.site-header {
      position: sticky;
      top: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      background: linear-gradient(90deg, #ef4444, #f97316, #10b981, #06b6d4, #6366f1);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.25s, background-color 0.25s;
      border-radius: 8px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: #eef2ff;
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn-rainbow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      color: #ffffff;
      text-decoration: none;
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 50%, #ec4899 100%);
      border-radius: 50px;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1.5px solid var(--border-color);
      border-radius: 50px;
      text-decoration: none;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f5f3ff;
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    main {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    section {
      width: 100%;
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      padding: 5px 14px;
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      border-radius: 20px;
      background: linear-gradient(90deg, rgba(239,68,68,0.12), rgba(6,182,212,0.12), rgba(168,85,247,0.12));
      color: var(--primary);
      margin-bottom: 12px;
      border: 1px solid rgba(79, 70, 229, 0.15);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 HERO (无图片) */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 50% 10%, rgba(99, 102, 241, 0.08) 0%, rgba(248, 250, 252, 1) 60%),
                  linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
      border-bottom: 1px solid #eef2f6;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 30px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      box-shadow: 0 2px 10px rgba(79, 70, 229, 0.08);
      margin-bottom: 24px;
      font-size: 0.9rem;
      color: #3730a3;
      font-weight: 600;
    }

    .hero-badge span.pulse-dot {
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 2.7rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 22px;
      max-width: 900px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      margin-top: 10px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 18px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.2s, box-shadow 0.2s;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #ef4444, #f59e0b, #10b981, #06b6d4, #6366f1);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .metric-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵 */
    .chips-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      padding: 8px 16px;
      background: #ffffff;
      border-radius: 40px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      border: 1px solid #e2e8f0;
      box-shadow: 0 1px 4px rgba(0,0,0,0.03);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: #6366f1;
      color: #4f46e5;
      background: #f5f3ff;
      transform: scale(1.04);
    }

    /* 卡片组通风格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-rainbow);
      border-color: #c7d2fe;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 评测与对比 */
    .eval-box {
      background: #ffffff;
      border-radius: 20px;
      padding: 40px;
      border: 1px solid #e0e7ff;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .score-badge {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(90deg, #4f46e5, #06b6d4);
      color: #ffffff;
      border-radius: 14px;
      padding: 20px 28px;
      margin-bottom: 30px;
    }

    .score-title {
      font-size: 1.3rem;
      font-weight: 700;
    }

    .score-num {
      font-size: 2.2rem;
      font-weight: 900;
      letter-spacing: -1px;
    }

    .table-wrap {
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #e2e8f0;
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

    .highlight-col {
      background: #f0f9ff;
      font-weight: 700;
      color: #0369a1;
    }

    /* 流程与网络 */
    .timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
    }

    .timeline-step {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ec4899, #6366f1);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
      font-weight: 800;
      font-size: 1rem;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 案例展示 */
    .media-box {
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }

    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s;
    }

    .media-box:hover img {
      transform: scale(1.02);
    }

    .media-caption {
      padding: 18px 20px;
    }

    .media-caption h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-caption p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .user-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #f59e0b, #ec4899);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .user-meta h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-body {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
    }

    /* FAQ */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: #6366f1;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.02rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--text-main);
      user-select: none;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-icon {
      font-weight: 700;
      font-size: 1.2rem;
      color: #6366f1;
      transition: transform 0.2s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      border-top: 1px dashed #f1f5f9;
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border-radius: 20px;
      padding: 40px;
      border: 1px solid #e0e7ff;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-control:focus {
      border-color: #6366f1;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    /* 资讯与百科 */
    .articles-box {
      background: #ffffff;
      border-radius: 16px;
      padding: 30px;
      border: 1px solid var(--border-color);
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-tag {
      display: inline-block;
      padding: 8px 16px;
      background: #f1f5f9;
      border-radius: 6px;
      font-size: 0.88rem;
      color: #334155;
      text-decoration: none;
      transition: all 0.2s;
    }

    .article-link-tag:hover {
      background: #4f46e5;
      color: #ffffff;
    }

    /* 联系我们与代理 */
    .contact-card {
      background: #ffffff;
      border-radius: 16px;
      padding: 30px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .contact-qr-img {
      width: 150px;
      height: 150px;
      margin-bottom: 16px;
      border-radius: 12px;
      padding: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .contact-qr-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    /* 页脚 */
    footer.site-footer {
      width: 100%;
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.92rem;
      margin-top: 60px;
      border-top: 4px solid;
      border-image: linear-gradient(90deg, #ef4444, #f59e0b, #10b981, #06b6d4, #6366f1, #a855f7) 1;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
      transition: background-color 0.2s, color 0.2s;
    }

    .friend-links a:hover {
      background: #334155;
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮客服面板 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      text-decoration: none;
      border: 1px solid #e2e8f0;
      cursor: pointer;
      position: relative;
      transition: transform 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    .float-qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      width: 150px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 6px;
    }

    .float-qr-pop span {
      font-size: 0.78rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .float-btn:hover .float-qr-pop {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-cta .btn-outline {
        display: none;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .grid-2, .hero-metrics, .timeline {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .score-badge {
        flex-direction: column;
        text-align: center;
        gap: 12px;
      }
    }