:root {
      --primary: #0f52ba;
      --primary-light: #2563eb;
      --primary-dark: #0a367a;
      --accent: #00d2ff;
      --accent-warm: #ff8c00;
      --bg-light: #f6f9fc;
      --bg-white: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --card-shadow: 0 10px 25px -5px rgba(15, 82, 186, 0.08), 0 8px 10px -6px rgba(15, 82, 186, 0.04);
      --card-hover: 0 20px 30px -10px rgba(15, 82, 186, 0.16);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 50% 0%, #edf4fc 0%, #f6f9fc 100%);
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 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: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(15, 82, 186, 0.05);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

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

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(15, 82, 186, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      line-height: 1.4;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(15, 82, 186, 0.35);
    }

    .btn-accent {
      background: linear-gradient(135deg, #00d2ff 0%, #0099ff 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(0, 153, 255, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 153, 255, 0.4);
    }

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

    .btn-outline:hover {
      background: rgba(15, 82, 186, 0.05);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 通用Section */
    .section {
      padding: 80px 0;
      position: relative;
    }

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

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

    .badge-pill {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      background: rgba(15, 82, 186, 0.08);
      border: 1px solid rgba(15, 82, 186, 0.18);
      border-radius: 50px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #0b1f44;
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 首屏 HERO (无图片) */
    .hero-section {
      padding: 90px 0 80px;
      text-align: center;
      background: linear-gradient(180deg, rgba(235, 244, 255, 0.7) 0%, rgba(246, 249, 252, 1) 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-glow {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 210, 255, 0.15) 0%, rgba(15, 82, 186, 0.05) 50%, transparent 70%);
      top: -150px;
      left: 50%;
      transform: translateX(-50%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.8rem;
      font-weight: 900;
      color: #0b1f44;
      line-height: 1.25;
      margin: 16px 0 20px;
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, #0099ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.2rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 35px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-btn-main {
      padding: 14px 36px;
      font-size: 1.1rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
    }

    .stat-item {
      text-align: center;
      padding: 8px;
    }

    .stat-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 模型矩阵标签 */
    .model-tags-bar {
      margin-top: 30px;
      padding-top: 24px;
      border-top: 1px dashed #cbd5e1;
      text-align: center;
    }

    .model-tags-label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: block;
    }

    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      font-size: 0.8rem;
      padding: 4px 10px;
      background: #ffffff;
      color: #334155;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      font-weight: 500;
    }

    /* 平台介绍 & 核心能力卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .card {
      background: #ffffff;
      border-radius: 14px;
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      position: relative;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover);
      border-color: rgba(15, 82, 186, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: 700;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f274a;
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 场景矩阵清单 (一站式创作) */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .scenario-card {
      background: #ffffff;
      border-radius: 12px;
      padding: 22px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .scenario-card:hover {
      border-color: var(--primary-light);
      box-shadow: 0 8px 24px rgba(15, 82, 186, 0.12);
    }

    .scenario-badge {
      align-self: flex-start;
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: 4px;
      background: #edf6ff;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 12px;
    }

    .scenario-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 8px;
    }

    .scenario-desc {
      font-size: 0.9rem;
      color: #475569;
      line-height: 1.55;
    }

    /* 图片与展示组合 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: center;
      margin-top: 30px;
    }

    .media-box {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      background: #ffffff;
      padding: 8px;
    }

    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
      object-fit: cover;
    }

    /* 对比评测模块 */
    .rating-banner {
      background: linear-gradient(135deg, #0f52ba 0%, #174288 100%);
      color: #ffffff;
      border-radius: 16px;
      padding: 32px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 12px 30px rgba(15, 82, 186, 0.25);
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: #00d2ff;
      line-height: 1;
    }

    .rating-stars {
      color: #ffb703;
      font-size: 1.5rem;
      margin-top: 6px;
    }

    .compare-table-wrap {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      overflow-x: auto;
    }

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

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

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #334155;
    }

    .compare-table tr:hover {
      background: #f1f7ff;
    }

    .highlight-col {
      background: rgba(15, 82, 186, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border-radius: 14px;
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .avatar-mock {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, #00d2ff 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-info .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      color: #0f172a;
      background: #ffffff;
      user-select: none;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      color: #475569;
      font-size: 0.95rem;
      line-height: 1.6;
      background: #fcfdfe;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 0 22px 18px 22px;
    }

    /* 需求匹配表单 & 联系 */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      padding: 40px;
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      color: #1e293b;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      background: #f8fafc;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.12);
    }

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 20px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-badge {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: rgba(15, 82, 186, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .contact-val {
      font-size: 0.95rem;
      color: #334155;
      font-weight: 500;
    }

    .qr-container {
      margin-top: 20px;
      display: flex;
      align-items: center;
      gap: 20px;
      background: #f8fafc;
      padding: 16px;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
    }

    .qr-container img {
      width: 100px;
      height: 100px;
      object-fit: cover;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
    }

    /* 资讯与外链列表 */
    .article-list-wrap {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 24px;
    }

    .article-item {
      background: #ffffff;
      border-radius: 10px;
      padding: 18px;
      border: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    /* 友情链接与底部 */
    .footer-section {
      background: #0b1f44;
      color: #94a3b8;
      padding: 50px 0 25px;
      font-size: 0.9rem;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .footer-links-box {
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding-bottom: 24px;
    }

    .footer-links-title {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .footer-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links-grid a {
      color: #cbd5e1;
      transition: color 0.2s;
    }

    .footer-links-grid a:hover {
      color: #00d2ff;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 15px;
      color: #64748b;
      font-size: 0.85rem;
    }

    /* 浮动工具栏 */
    .floating-toolbar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: all 0.25s ease;
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-h1 {
        font-size: 2.2rem;
      }
      .grid-3, .grid-4, .reviews-grid, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-layout, .media-showcase-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .grid-4, .reviews-grid, .process-steps, .article-list-wrap {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 1.8rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .section {
        padding: 55px 0;
      }
    }