:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --color-primary: #2563eb;
      --color-accent-orange: #ff5400;
      --color-accent-cyan: #00d2b4;
      --color-accent-purple: #7928ca;
      --color-accent-yellow: #ffb703;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 16px 28px -6px rgba(37, 99, 235, 0.12), 0 8px 12px -4px rgba(15, 23, 42, 0.04);
      --radius: 12px;
      --transition: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      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: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.03) 0%, transparent 40%),
                  radial-gradient(circle at 90% 90%, rgba(255, 84, 0, 0.03) 0%, transparent 40%),
                  var(--bg-main);
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 800;
      font-size: 1.25rem;
    }

    .brand-logo img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 600;
      padding: 8px 14px;
      border-radius: 6px;
      transition: var(--transition);
      display: inline-block;
    }

    .nav-links a:hover {
      color: var(--color-primary);
      background-color: rgba(37, 99, 235, 0.08);
    }

    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 8px;
      text-decoration: none;
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition);
    }

    .btn-contrast-orange {
      background: linear-gradient(135deg, #ff5400, #ff8c00);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 84, 0, 0.35);
    }

    .btn-contrast-orange:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 84, 0, 0.45);
    }

    .btn-contrast-blue {
      background: linear-gradient(135deg, #2563eb, #1d4ed8);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

    .btn-contrast-blue:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .btn-outline:hover {
      border-color: var(--color-primary);
      color: var(--color-primary);
      background: rgba(37, 99, 235, 0.04);
    }

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

    /* 首屏 Hero - 无图片设计，撞色视觉 */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(241, 245, 249, 0.6) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.3rem;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content h1 span.gradient-text {
      background: linear-gradient(90deg, #2563eb, #ff5400);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 24px;
    }

    .badge-tag {
      font-size: 0.82rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      background: #eef2ff;
      color: #3730a3;
      border: 1px solid #c7d2fe;
    }

    .badge-tag.orange {
      background: #fff7ed;
      color: #9a3412;
      border-color: #fed7aa;
    }

    .badge-tag.cyan {
      background: #ecfdf5;
      color: #065f46;
      border-color: #a7f3d0;
    }

    .hero-cta {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }

    .hero-visual-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      box-shadow: var(--shadow-lg);
      position: relative;
      overflow: hidden;
    }

    .hero-visual-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 6px;
      background: linear-gradient(90deg, #2563eb, #ff5400, #00d2b4);
    }

    .code-simulation {
      background: #0f172a;
      border-radius: 10px;
      padding: 16px;
      color: #38bdf8;
      font-family: monospace;
      font-size: 0.85rem;
      line-height: 1.5;
      margin-bottom: 16px;
    }

    .code-keyword { color: #f43f5e; }
    .code-string { color: #4ade80; }
    .code-param { color: #fbbf24; }

    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .matrix-item {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: 8px;
      text-align: center;
    }

    .matrix-val {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--color-primary);
    }

    .matrix-label {
      font-size: 0.78rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 通用Section */
    .section-py {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-sub {
      font-size: 0.9rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--color-accent-orange);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .card-tag {
      display: inline-block;
      align-self: flex-start;
      padding: 3px 10px;
      border-radius: 6px;
      font-size: 0.75rem;
      font-weight: 700;
      margin-bottom: 12px;
      background: #eff6ff;
      color: #1d4ed8;
    }

    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 平台支持模型流光墙 */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      color: #1e293b;
      box-shadow: 0 2px 4px rgba(0,0,0,0.03);
      transition: var(--transition);
    }

    .model-pill:hover {
      border-color: var(--color-primary);
      background: #eff6ff;
      color: var(--color-primary);
      transform: scale(1.05);
    }

    /* 对比评测表格与卡片 */
    .evaluation-box {
      background: #ffffff;
      border: 2px solid #2563eb;
      border-radius: 16px;
      padding: 30px;
      box-shadow: var(--shadow-lg);
      margin-bottom: 40px;
    }

    .eval-header {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 20px;
      margin-bottom: 24px;
      gap: 20px;
    }

    .score-badge {
      display: flex;
      align-items: center;
      gap: 16px;
      background: #fff7ed;
      padding: 12px 24px;
      border-radius: 12px;
      border: 1px solid #fdba74;
    }

    .score-val {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--color-accent-orange);
    }

    .score-stars {
      color: #eab308;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .eval-table th, .eval-table td {
      padding: 16px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .eval-table tr:hover td {
      background: #f1f5f9;
    }

    .eval-highlight {
      font-weight: 700;
      color: var(--color-primary);
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

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

    .step-number {
      width: 44px;
      height: 44px;
      line-height: 44px;
      border-radius: 50%;
      background: var(--color-primary);
      color: #ffffff;
      font-weight: 800;
      margin: 0 auto 16px;
      font-size: 1.1rem;
    }

    /* 案例图片展示容器 */
    .case-gallery {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-top: 30px;
    }

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

    .media-card .img-box {
      width: 100%;
      background: #e2e8f0;
    }

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-info {
      padding: 18px;
    }

    .media-info h4 {
      font-size: 1.1rem;
      margin-bottom: 6px;
      color: var(--text-main);
    }

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

    /* 评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      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: 14px;
    }

    .review-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2563eb, #ff5400);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .review-meta h4 {
      font-size: 0.98rem;
      color: var(--text-main);
    }

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

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

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 20px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 20px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
      background: #fafafa;
    }

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

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-lg);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1.5px solid var(--border-color);
      border-radius: 8px;
      background: #f8fafc;
      outline: none;
      transition: var(--transition);
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: var(--color-primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 20px;
    }

    .qr-card-box {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .qr-card-box img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      display: block;
    }

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

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

    /* 资讯列表与友链 */
    .article-links, .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-links a, .friendly-links a {
      text-decoration: none;
      font-size: 0.9rem;
      color: var(--color-primary);
      background: #eff6ff;
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid #bfdbfe;
      transition: var(--transition);
    }

    .article-links a:hover, .friendly-links a:hover {
      background: var(--color-primary);
      color: #ffffff;
    }

    /* 页脚统一规范 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #f8fafc;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.8;
      margin-bottom: 10px;
    }

    .footer-col a {
      color: #cbd5e1;
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-col a:hover {
      color: var(--color-accent-orange);
    }

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 2px solid #2563eb;
      border-radius: 50px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      box-shadow: var(--shadow-lg);
      text-decoration: none;
      color: #0f172a;
      font-weight: 700;
      font-size: 0.9rem;
      transition: var(--transition);
    }

    .float-kefu:hover {
      transform: scale(1.05);
      background: #2563eb;
      color: #ffffff;
    }

    .float-kefu-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #22c55e;
      animation: pulse 1.5s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
      70% { box-shadow: 0 0 0 10px rgba(34, 197, 94, 0); }
      100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
    }

    /* 响应式断点适配 */
    @media (max-width: 992px) {
      .hero-wrapper {
        grid-template-columns: 1fr;
      }
      .case-gallery {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 2px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.5rem;
      }
    }