:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #ec4899;
      --accent: #f59e0b;
      --cyan: #06b6d4;
      --dark: #0f172a;
      --text: #1e293b;
      --muted: #64748b;
      --bg: #fafaf9;
      --card-bg: #ffffff;
      --border: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.06), 0 8px 10px -6px rgba(0,0,0,0.04);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.12);
      --doodle-border: 2px solid #1e293b;
      --doodle-shadow: 4px 4px 0px #1e293b;
    }
    * {
      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);
      color: var(--text);
      line-height: 1.6;
      background-image: radial-gradient(#e2e8f0 1px, transparent 1px);
      background-size: 24px 24px;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section-padding {
      padding: 72px 0;
    }
    .section-title-wrap {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.875rem;
      font-weight: 700;
      background: #fef08a;
      border: var(--doodle-border);
      box-shadow: 2px 2px 0px #1e293b;
      border-radius: 20px;
      margin-bottom: 12px;
      color: var(--dark);
      transform: rotate(-1.5deg);
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--muted);
      margin-top: 10px;
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 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: var(--doodle-border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-area img {
      height: 42px;
      width: auto;
    }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 900;
      color: var(--dark);
    }
    .logo-text span {
      color: var(--primary);
      display: inline-block;
      border-bottom: 3px solid var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li {
      margin: 0 10px;
    }
    .nav-links a {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--primary);
      background: #eff6ff;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      background: var(--primary);
      color: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      cursor: pointer;
      transition: transform 0.15s ease, box-shadow 0.15s ease;
    }
    .btn-main:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px #1e293b;
      color: #ffffff;
    }
    .btn-main:active {
      transform: translate(2px, 2px);
      box-shadow: 2px 2px 0px #1e293b;
    }
    .btn-accent {
      background: #facc15;
      color: var(--dark);
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--dark);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, #f8fafc 0%, #ede9fe 100%);
      border-bottom: var(--doodle-border);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 18px;
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: 3px 3px 0px #1e293b;
      border-radius: 30px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
      transform: rotate(0.8deg);
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: #334155;
      margin-bottom: 32px;
      line-height: 1.8;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-cta .btn-main {
      padding: 14px 36px;
      font-size: 1.1rem;
    }
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }
    .model-pill {
      background: #ffffff;
      border: 1.5px solid #1e293b;
      padding: 4px 12px;
      border-radius: 12px;
      font-size: 0.8rem;
      font-weight: 600;
      box-shadow: 2px 2px 0px #1e293b;
      color: #334155;
    }

    /* 数据指标 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }
    .metric-card {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      text-align: center;
      transition: transform 0.2s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
    }
    .metric-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
    }
    .metric-label {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark);
      margin-top: 4px;
    }

    /* 服务能力卡片 */
    .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;
    }
    .service-card {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.2s ease;
      position: relative;
      overflow: hidden;
    }
    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 6px;
      background: var(--primary);
    }
    .service-card:nth-child(2n)::before {
      background: var(--secondary);
    }
    .service-card:nth-child(3n)::before {
      background: var(--accent);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 6px 6px 0px #1e293b;
    }
    .service-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
      display: inline-block;
      width: 54px;
      height: 54px;
      line-height: 54px;
      text-align: center;
      background: #eff6ff;
      border: var(--doodle-border);
      border-radius: 12px;
    }
    .service-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .service-text {
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .feature-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .feature-tag-list span {
      background: #f1f5f9;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 6px;
      color: #475569;
    }

    /* 素材图片图文混排 */
    .media-block {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 36px;
    }
    .media-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .media-img-wrapper {
      border: var(--doodle-border);
      box-shadow: 4px 4px 0px #1e293b;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #f8fafc;
    }
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .banner-item {
      border: var(--doodle-border);
      box-shadow: 3px 3px 0px #1e293b;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
    }

    /* 流程步骤 */
    .step-item {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-badge {
      display: inline-block;
      width: 38px;
      height: 38px;
      line-height: 38px;
      text-align: center;
      background: #fef08a;
      border: var(--doodle-border);
      border-radius: 50%;
      font-weight: 900;
      font-size: 1.1rem;
      margin-bottom: 12px;
    }

    /* 对比评测 */
    .eval-highlight {
      background: #ecfdf5;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 28px;
    }
    .eval-score {
      font-size: 2.8rem;
      font-weight: 900;
      color: #059669;
    }
    .table-container {
      overflow-x: auto;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      background: #ffffff;
    }
    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 0.95rem;
    }
    th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--dark);
      border-bottom: 2px solid var(--dark);
    }
    tr:last-child td {
      border-bottom: none;
    }
    .col-highlight {
      background: #f0fdf4;
      font-weight: 700;
      color: #15803d;
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #dbeafe;
      border: var(--doodle-border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
    }
    .user-meta h4 {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--dark);
    }
    .user-meta p {
      font-size: 0.8rem;
      color: var(--muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 800;
      font-size: 1.05rem;
      color: var(--dark);
      background: #ffffff;
    }
    .faq-question:hover {
      background: #fafafa;
    }
    .faq-icon {
      font-size: 1.2rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }
    .faq-answer {
      display: none;
      padding: 0 24px 18px;
      color: #475569;
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px dashed var(--border);
    }
    .faq-item.active .faq-answer {
      display: block;
      padding-top: 14px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }
    .contact-card, .form-card {
      background: #ffffff;
      border: var(--doodle-border);
      box-shadow: var(--doodle-shadow);
      border-radius: var(--radius-lg);
      padding: 36px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 6px;
      font-size: 0.95rem;
      color: var(--dark);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: var(--doodle-border);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      background: #f8fafc;
      color: var(--dark);
    }
    .form-control:focus {
      outline: none;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .qr-box {
      border: var(--doodle-border);
      padding: 12px;
      background: #ffffff;
      display: inline-block;
      border-radius: var(--radius-sm);
      box-shadow: 3px 3px 0px #1e293b;
      margin-top: 16px;
      max-width: 160px;
    }

    /* 文章列表 & 友情链接 */
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }
    .article-link-item {
      background: #eff6ff;
      border: 1.5px solid #1e293b;
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e40af;
    }
    .article-link-item:hover {
      background: #dbeafe;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .friend-links a {
      background: #ffffff;
      border: 1.5px solid #1e293b;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark);
    }
    .friend-links a:hover {
      background: #fef08a;
    }

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      background: #facc15;
      border: var(--doodle-border);
      box-shadow: 3px 3px 0px #1e293b;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      transition: transform 0.15s ease;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: var(--doodle-border);
      padding: 48px 0 24px;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 36px;
    }
    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 16px;
      border-left: 4px solid var(--primary);
      padding-left: 8px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 8px;
    }
    .footer-col ul a {
      font-size: 0.9rem;
      color: #475569;
    }
    .footer-col ul a:hover {
      color: var(--primary);
    }
    .copyright-area {
      border-top: 1px dashed var(--border);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--muted);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.4rem; }
      .metrics-bar { grid-template-columns: repeat(2, 1fr); margin-top: 20px; }
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .banner-gallery { grid-template-columns: repeat(2, 1fr); }
      .media-grid, .contact-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: var(--doodle-border);
        padding: 16px 0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        margin: 6px 0;
        text-align: center;
      }
      .mobile-menu-btn { display: block; }
      .hero-title { font-size: 1.8rem; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .banner-gallery { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .eval-highlight { flex-direction: column; gap: 16px; text-align: center; }
    }