:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --accent: #0ea5e9;
      --accent-warm: #f59e0b;
      --success: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-card-soft: #f1f5f9;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.08);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-xl: 24px;
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      padding: 10px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
      transform: translateY(-1px);
    }

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

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

    .btn-accent {
      background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
      color: #ffffff;
    }

    .btn-accent:hover {
      background: #d97706;
      transform: translateY(-1px);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      padding: 6px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero - 无图片设计，高亮度鲜活科技风 */
    .hero-section {
      position: relative;
      padding: 80px 0 70px;
      background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-glow-1 {
      position: absolute;
      top: -100px;
      right: 5%;
      width: 450px;
      height: 450px;
      background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, rgba(255, 255, 255, 0) 70%);
      pointer-events: none;
      z-index: 1;
    }

    .hero-glow-2 {
      position: absolute;
      bottom: -60px;
      left: 0;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
      pointer-events: none;
      z-index: 1;
    }

    .hero-container {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      border-radius: 999px;
      margin-bottom: 24px;
      animation: pulseLight 3s infinite;
    }

    .badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
    }

    .hero-badge-text {
      font-size: 13px;
      font-weight: 600;
      color: #0369a1;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 40px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-btn-primary {
      padding: 14px 34px;
      font-size: 17px;
      border-radius: var(--radius-md);
    }

    .hero-btn-secondary {
      padding: 14px 28px;
      font-size: 17px;
      border-radius: var(--radius-md);
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      text-align: left;
    }

    .metric-card {
      background: #ffffff;
      padding: 20px 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-focus);
    }

    .metric-val {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-name {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
    }

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

    .section-alt {
      background-color: #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 46px;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 10px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-intro {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵胶囊云 */
    .model-capsule-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-capsule {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: 999px;
      border: 1px solid var(--border-color);
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-capsule:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }

    /* 网格卡片系统 */
    .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;
      padding: 28px 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      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: var(--border-focus);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .card-meta-list {
      list-style: none;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .card-meta-item {
      font-size: 13px;
      color: var(--text-light);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .card-meta-item::before {
      content: "";
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background-color: var(--primary);
    }

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

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

    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }

    .step-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 评测与对比板块 */
    .eval-highlight-box {
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: var(--radius-xl);
      padding: 36px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .eval-score-area {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .eval-score-num {
      font-size: 54px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .eval-score-detail {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 18px;
      letter-spacing: 2px;
    }

    .eval-recommend-text {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .eval-summary-text {
      max-width: 580px;
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 720px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .td-highlight {
      background: #eff6ff;
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例展示区（带图） */
    .case-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .case-img-wrap {
      width: 100%;
      height: 220px;
      background: #e2e8f0;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      margin-bottom: 8px;
      display: inline-block;
    }

    .case-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .case-summary {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 横版素材宣传图展示模块 */
    .banner-media-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 36px;
    }

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

    .banner-media-item img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      padding: 24px;
      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-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .user-name-title {
      display: flex;
      flex-direction: column;
    }

    .user-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-role {
      font-size: 12px;
      color: var(--text-light);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: normal;
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      background: #ffffff;
    }

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

    .faq-toggle-icon {
      font-size: 18px;
      color: var(--text-light);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fcfdfe;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 需求匹配表单与联系我们 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }

    .contact-side-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .contact-method-list {
      list-style: none;
      margin: 24px 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-method-item {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .contact-method-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-light);
    }

    .contact-method-val {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .kefu-qr-box {
      margin-top: 20px;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .kefu-qr-box img {
      max-width: 140px;
      margin: 0 auto 10px;
      border-radius: var(--radius-sm);
    }

    .form-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 15px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      background: #ffffff;
      color: var(--text-main);
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* 文章列表 & 友情链接 */
    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-item-link {
      background: #ffffff;
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .article-item-link:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }

    .friend-links-box {
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links-box a {
      color: var(--text-light);
      font-size: 13px;
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .friend-links-box a:hover {
      color: var(--primary);
    }

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

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

    .footer-brand-desc {
      font-size: 14px;
      line-height: 1.7;
      margin-top: 12px;
      color: #94a3b8;
      max-width: 420px;
    }

    .footer-col-title {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-list li a {
      color: #94a3b8;
      font-size: 14px;
    }

    .footer-list li a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      color: #64748b;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-copy {
      color: #94a3b8;
    }

    /* 浮动咨询挂件 */
    .floating-support {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
      border: none;
    }

    .floating-btn:hover {
      transform: scale(1.08);
      background: var(--primary-hover);
    }

    .back-top-btn {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      display: none;
    }

    .back-top-btn:hover {
      background: var(--primary-light);
      color: var(--primary);
    }

    /* 动画 */
    @keyframes pulseLight {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.8; }
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-media-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        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;
        align-items: flex-start;
        padding: 16px 20px;
        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;
        width: 100%;
        padding: 10px 0;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .hero-metrics-grid {
        grid-template-columns: 1fr;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .banner-media-row {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }