:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --accent: #f97316;
      --accent-glow: #ffedd5;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --brand-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #6366f1 100%);
      --bright-gradient: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(2,132,199,0.08);
      --shadow-lg: 0 10px 25px rgba(2,132,199,0.12);
      --container-max: 1200px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.08) 0px, transparent 50%), radial-gradient(at 100% 100%, rgba(249, 115, 22, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--primary-hover);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .logo-box {
      max-height: 42px;
      display: flex;
      align-items: center;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 10px 14px;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      border-radius: 6px;
      transition: background 0.2s, color 0.2s;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(2, 132, 199, 0.06);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 20px;
      border-radius: 8px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--brand-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
      transform: translateY(-2px);
      color: #ffffff;
    }

    .btn-accent {
      background: #f97316;
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
    }

    .btn-accent:hover {
      background: #ea580c;
      transform: translateY(-2px);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary) !important;
    }

    .btn-outline:hover {
      background: rgba(2, 132, 199, 0.05);
      border-color: var(--primary-hover);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 72px 0 60px;
      background: linear-gradient(180deg, #ffffff 0%, rgba(239, 246, 255, 0.6) 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }

    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      color: #0369a1;
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
    }

    .hero-title span {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

    .hero-cta-box {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-official-btn {
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: 10px;
      background: #0284c7;
      color: #ffffff !important;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(2, 132, 199, 0.35);
      border: 2px solid #38bdf8;
    }

    .hero-official-btn:hover {
      background: #0369a1;
      transform: translateY(-2px);
      box-shadow: 0 10px 28px rgba(2, 132, 199, 0.45);
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      padding-top: 32px;
      border-top: 1px solid rgba(226, 232, 240, 0.8);
    }

    .feature-point {
      padding: 16px;
      background: #ffffff;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: left;
    }

    .feature-point-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .feature-point-title::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
    }

    .feature-point-text {
      font-size: 0.84rem;
      color: var(--text-muted);
    }

    /* 通用章节样式 */
    .section-padding {
      padding: 68px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.06em;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 卡片网格 */
    .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;
    }

    .card {
      background: var(--bg-card);
      border-radius: 12px;
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #93c5fd;
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .card-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台介绍特别板块 */
    .about-box {
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid #dbeafe;
      padding: 40px;
      box-shadow: var(--shadow-md);
      position: relative;
      overflow: hidden;
    }

    .about-box::after {
      content: "";
      position: absolute;
      top: 0;
      right: 0;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(56,189,248,0.15) 0%, transparent 70%);
      pointer-events: none;
    }

    .about-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 32px;
    }

    .highlight-item {
      background: #f8fafc;
      padding: 20px;
      border-radius: 10px;
      border-left: 4px solid var(--primary);
    }

    .highlight-item h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .highlight-item p {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 对比评测表格板块 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #eff6ff 0%, #fff7ed 100%);
      border: 1px solid #fed7aa;
      border-radius: 12px;
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      margin-bottom: 32px;
      text-align: center;
    }

    .score-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #9a3412;
    }

    .score-stars {
      color: #ea580c;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin: 4px 0;
    }

    .score-number {
      font-size: 2.4rem;
      font-weight: 900;
      color: #c2410c;
      line-height: 1;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .eval-table th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 700;
    }

    .eval-table tr:last-child td {
      border-bottom: none;
    }

    .eval-table .highlight-col {
      background: #f0fdf4;
      font-weight: 700;
      color: #15803d;
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--brand-gradient);
      color: #ffffff;
      border-radius: 50%;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
    }

    /* 案例展示画廊 */
    .media-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .media-card {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-img-wrap {
      width: 100%;
      height: 220px;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .media-img-wrap:hover img {
      transform: scale(1.05);
    }

    .media-info {
      padding: 16px;
    }

    .media-info h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.84rem;
      color: var(--text-muted);
    }

    /* 客户评论卡片 */
    .review-card {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      font-style: italic;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }

    .user-avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      color: var(--text-main);
      font-weight: 700;
    }

    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.02rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #f8fafc;
      color: var(--primary);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed #f1f5f9;
      background: #fafbfc;
    }

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

    /* 需求匹配与联系我们表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 40px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #f8fafc;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
      background: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-panel {
      background: #f8fafc;
      border-radius: 12px;
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-meta-item {
      margin-bottom: 18px;
    }

    .contact-meta-item strong {
      display: block;
      color: var(--text-main);
      font-size: 0.95rem;
      margin-bottom: 4px;
    }

    .contact-meta-item p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .qr-box {
      margin-top: 16px;
      padding: 16px;
      background: #ffffff;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      display: inline-flex;
      align-items: center;
      gap: 16px;
    }

    .qr-img {
      width: 100px;
      height: 100px;
      object-fit: cover;
      border-radius: 6px;
    }

    /* 资讯与友情链接板块 */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-chip {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      font-size: 0.88rem;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: var(--shadow-sm);
    }

    .article-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      color: var(--text-muted);
      font-size: 0.88rem;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 24px;
    }

    .footer-brand h3 {
      color: var(--text-main);
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    .footer-links-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .footer-links-group a {
      color: var(--text-muted);
      font-size: 0.88rem;
    }

    .footer-links-group a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动客服与返回顶部 */
    .float-widget {
      position: fixed;
      right: 24px;
      bottom: 32px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-features-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-highlights {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 64px;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid #f1f5f9;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .grid-3, .grid-2, .media-gallery {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .hero-features-bar {
        grid-template-columns: 1fr;
      }
      .steps-row {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        gap: 16px;
      }
    }