:root {
      --primary-orange: #ff5400;
      --primary-orange-hover: #e04800;
      --orange-light: #fff5eb;
      --orange-subtle: #ffe8d6;
      --orange-gradient: linear-gradient(135deg, #ff6b00 0%, #ff3b00 100%);
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-sub: #6b7280;
      --bg-page: #faf9f6;
      --bg-card: #ffffff;
      --border-color: #f0e6dc;
      --border-accent: #ffd8be;
      --shadow-sm: 0 2px 8px rgba(255, 84, 0, 0.06);
      --shadow-md: 0 8px 24px rgba(255, 84, 0, 0.1);
      --shadow-lg: 0 16px 36px rgba(255, 84, 0, 0.14);
      --container-width: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      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-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

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

    .section-padding {
      padding: 72px 0;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-orange);
      background-color: var(--orange-light);
      border: 1px solid var(--border-accent);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 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);
    }

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

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

    .brand-logo-box img.ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
      text-align: center;
    }

    .btn-primary {
      background: var(--orange-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(255, 84, 0, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 84, 0, 0.4);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-orange) !important;
      border: 1px solid var(--primary-orange);
    }

    .btn-outline:hover {
      background: var(--orange-light);
    }

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

    /* Hero 首屏 - 纯几何渐变无图片 */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffe9dc 0%, #faf9f6 60%);
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-accent);
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--primary-orange);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: #111827;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 36px;
    }

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

    .hero-btns .btn {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: 999px;
    }

    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 24px;
    }

    .highlight-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

    .highlight-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-orange);
    }

    .highlight-card .h-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-orange);
      margin-bottom: 4px;
    }

    .highlight-card .h-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 平台聚合标签墙 */
    .model-tags-bar {
      background: #ffffff;
      padding: 24px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .tags-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: var(--primary-orange);
      color: var(--primary-orange);
      background: var(--orange-light);
    }

    /* 通用网格与卡片 */
    .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;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--orange-light);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--primary-orange);
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 案例展示区（带图片） */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .media-img-wrapper {
      position: relative;
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eee;
      overflow: hidden;
    }

    .media-img-wrapper.square {
      aspect-ratio: 1 / 1;
    }

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

    .media-body {
      padding: 22px;
    }

    .media-body h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .media-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--orange-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测板块 */
    .review-score-panel {
      background: #ffffff;
      border: 2px solid var(--primary-orange);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

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

    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary-orange);
      line-height: 1;
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.4rem;
      margin-bottom: 6px;
    }

    .score-info h3 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .score-info p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

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

    .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);
      font-size: 0.95rem;
    }

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

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

    .highlight-cell {
      font-weight: 700;
      color: var(--primary-orange);
      background: #fffbf7;
    }

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

    .testimonial-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f3ede6;
      padding-top: 14px;
    }

    .user-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--orange-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* 折叠 FAQ */
    .faq-accordion {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all 0.2s;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
    }

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

    .faq-arrow {
      font-size: 0.85rem;
      transition: transform 0.3s;
      color: var(--primary-orange);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      border-top: 1px dashed #f3ede6;
      padding-top: 16px;
    }

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

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .contact-info p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 18px;
      background: var(--orange-light);
      padding: 18px;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
      border: 1px solid var(--border-accent);
    }

    .qr-container img {
      width: 90px;
      height: 90px;
      border-radius: var(--radius-sm);
      display: block;
      background: #ffffff;
      padding: 4px;
    }

    .contact-details-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #faf9f6;
      transition: all 0.2s;
      font-family: inherit;
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-orange);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 84, 0, 0.12);
    }

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

    /* 宣传展示 Banner */
    .banner-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-bottom: 40px;
    }

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

    .banner-item img.ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 最新文章与外链列表 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
    }

    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-item-link {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 600;
    }

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

    /* 页脚设计 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      color: var(--text-muted);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 36px;
    }

    .footer-brand h4 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
    }

    .footer-nav h5, .footer-links h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-nav-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 0.9rem;
    }

    .footer-nav-list a:hover {
      color: var(--primary-orange);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .friend-links-box a {
      font-size: 0.85rem;
      background: var(--bg-page);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
      color: var(--text-muted);
    }

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

    .footer-bottom {
      border-top: 1px solid #f3ede6;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 悬浮客服挂件 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--orange-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(255, 84, 0, 0.4);
      cursor: pointer;
      font-weight: 700;
      font-size: 0.9rem;
      transition: all 0.25s;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-highlights {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .banner-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        text-align: center;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-highlights {
        grid-template-columns: 1fr;
      }
      .grid-3, .grid-4, .grid-2, .process-steps {
        grid-template-columns: 1fr;
      }
      .review-score-panel {
        flex-direction: column;
        text-align: center;
      }
      .score-badge-area {
        flex-direction: column;
      }
    }