:root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --primary-light: #eff6ff;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --max-w: 1200px;
      --radius: 12px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 20%, rgba(239, 246, 255, 0.7) 0%, rgba(248, 250, 252, 0.9) 100%);
      color: var(--text-main);
      overflow-x: hidden;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: var(--max-w);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.02em;
    }

    .brand-tag {
      font-size: 0.75rem;
      background: var(--primary-light);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 9999px;
      font-weight: 600;
    }

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

    .nav-links li a {
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2563eb, #1d4ed8);
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #1d4ed8, #1e40af);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
      transform: translateY(-1px);
    }

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

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

    .btn-accent {
      background: linear-gradient(135deg, #f97316, #ea580c);
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(249, 115, 22, 0.25);
    }

    .btn-accent:hover {
      background: linear-gradient(135deg, #ea580c, #c2410c);
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
    }

    /* 区域通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 600;
      color: var(--primary);
      background: #dbeafe;
      padding: 4px 14px;
      border-radius: 9999px;
      margin-bottom: 12px;
      letter-spacing: 0.05em;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 首屏 HERO - 绝对不出现任何图片 */
    .hero-section {
      padding: 90px 0 80px;
      background: linear-gradient(180deg, rgba(239, 246, 255, 0.5) 0%, rgba(248, 250, 252, 0.9) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      padding: 6px 16px;
      border-radius: 9999px;
      font-size: 0.875rem;
      color: var(--primary-dark);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.2;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
      max-width: 920px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #1d4ed8, #f97316);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      line-height: 1.7;
      margin-bottom: 36px;
    }

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

    .btn-hero-official {
      background: linear-gradient(135deg, #ea580c, #f97316);
      color: #ffffff;
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: 10px;
      box-shadow: 0 4px 18px rgba(249, 115, 22, 0.35);
      border: 1px solid transparent;
      font-weight: 700;
    }

    .btn-hero-official:hover {
      background: linear-gradient(135deg, #c2410c, #ea580c);
      transform: translateY(-2px);
      box-shadow: 0 6px 22px rgba(249, 115, 22, 0.45);
    }

    .hero-stats-panel {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      max-width: 1000px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
      padding: 12px;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-val {
      font-size: 1.95rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1;
      margin-bottom: 6px;
    }

    .stat-val em {
      font-style: normal;
      font-size: 1.1rem;
      color: var(--accent);
      margin-left: 2px;
    }

    .stat-desc {
      font-size: 0.875rem;
      color: var(--text-sub);
    }

    /* 平台聚合标签墙 */
    .model-pills-wrap {
      margin-top: 36px;
      width: 100%;
      max-width: 1000px;
      text-align: center;
    }

    .model-pills-title {
      font-size: 0.875rem;
      color: var(--text-sub);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

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

    .model-tag {
      font-size: 0.8rem;
      color: var(--text-muted);
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 4px 12px;
      border-radius: 6px;
      font-weight: 500;
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: #93c5fd;
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 通用卡片网格 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

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

    .ui-card:hover {
      border-color: #bfdbfe;
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

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

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-footer-action {
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid #f1f5f9;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* 流程步骤 */
    .steps-container {
      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);
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 16px;
    }

    /* 对比评测板块 */
    .eval-score-card {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 36px;
    }

    .score-summary-left h3 {
      font-size: 1.5rem;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .score-summary-left p {
      color: #94a3b8;
      font-size: 0.95rem;
    }

    .score-badge-box {
      text-align: right;
      background: rgba(255, 255, 255, 0.08);
      padding: 16px 24px;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .score-rating {
      color: #fbbf24;
      font-size: 1.25rem;
      margin-bottom: 4px;
    }

    .score-number {
      font-size: 2.4rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .score-number small {
      font-size: 1.1rem;
      color: #94a3b8;
      font-weight: 500;
    }

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

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

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

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

    /* 案例中心 & 真实素材图片 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .media-img-container {
      width: 100%;
      position: relative;
      background: #e2e8f0;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-img-container img {
      max-width: 100%;
      height: auto;
      display: block;
      transition: transform 0.35s ease;
    }

    .media-card:hover .media-img-container img {
      transform: scale(1.03);
    }

    .media-body {
      padding: 20px;
      flex-grow: 1;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: #bfdbfe;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-icon {
      font-size: 1.25rem;
      color: var(--text-sub);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 22px 20px;
      border-top: 1px solid var(--border-color);
    }

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

    /* 评论板块 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
    }

    .testimonial-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }

    .avatar-fake {
      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: 1rem;
    }

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

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

    /* 表单与联系 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: start;
    }

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

    .contact-field-group {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item-row {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .qr-container {
      margin-top: 20px;
      text-align: center;
      padding: 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px dashed var(--border-color);
    }

    .qr-container img {
      max-width: 140px;
      height: auto;
      display: block;
      margin: 0 auto 10px;
      border-radius: 6px;
    }

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

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      transition: var(--transition);
      outline: none;
    }

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

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

    /* 资讯与外链 */
    .article-links-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 24px;
    }

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

    .article-pill {
      font-size: 0.85rem;
      padding: 6px 14px;
      background: #f1f5f9;
      color: var(--primary-dark);
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .article-pill:hover {
      background: var(--primary-light);
      border-color: #bfdbfe;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-muted);
      font-size: 0.925rem;
    }

    .footer-links-block {
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 24px;
      margin-bottom: 24px;
    }

    .footer-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

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

    .friendly-links a {
      color: var(--text-sub);
      font-size: 0.875rem;
    }

    .friendly-links a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 悬浮客服面板 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.25rem;
    }

    .floating-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 移动端响应式 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats-panel {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3,
      .cards-grid-4,
      .steps-container,
      .media-card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats-panel {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .stat-item:last-child {
        border-bottom: none;
      }
      .cards-grid-3,
      .cards-grid-4,
      .cards-grid-2,
      .steps-container,
      .media-card-grid {
        grid-template-columns: 1fr;
      }
      .eval-score-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
      }
      .score-badge-box {
        text-align: left;
        width: 100%;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }