:root {
      --primary-red: #d32f2f;
      --deep-red: #b71c1c;
      --crimson-red: #9a0007;
      --warm-red: #ff5252;
      --accent-gold: #e65100;
      --bg-light: #fffcfc;
      --card-bg: #ffffff;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --border-light: #fee2e2;
      --shadow-sm: 0 4px 12px rgba(211, 47, 47, 0.05);
      --shadow-md: 0 8px 24px rgba(211, 47, 47, 0.08);
      --shadow-lg: 0 16px 36px rgba(183, 28, 28, 0.12);
      --border-radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      color: var(--text-main);
      background-color: var(--bg-light);
      background-image: 
        radial-gradient(at 0% 0%, rgba(254, 226, 226, 0.5) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(254, 202, 202, 0.3) 0px, transparent 50%);
      background-attachment: fixed;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--border-light);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box .ai-page-logo {
      height: 44px;
      width: auto;
      display: block;
    }
    .brand-title-wrap {
      display: flex;
      flex-direction: column;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--deep-red);
      line-height: 1.2;
    }
    .brand-sub {
      font-size: 0.75rem;
      color: var(--text-muted);
      letter-spacing: 0.5px;
    }
    .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: 6px;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary-red);
      background-color: #fff1f2;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      background: linear-gradient(135deg, var(--primary-red) 0%, var(--deep-red) 100%);
      color: #ffffff !important;
      font-size: 0.92rem;
      font-weight: 700;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(211, 47, 47, 0.25);
    }
    .btn-nav-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(211, 47, 47, 0.35);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-light);
      padding: 8px;
      border-radius: 6px;
      cursor: pointer;
      color: var(--primary-red);
    }
    /* 首屏 Hero (无图片纯CSS) */
    .hero-section {
      padding: 64px 0 54px;
      position: relative;
    }
    .hero-box {
      background: linear-gradient(145deg, #ffffff 0%, #fff5f5 55%, #ffe4e6 100%);
      border: 1px solid var(--border-light);
      border-top: 4px solid var(--primary-red);
      border-radius: 20px;
      padding: 56px 44px;
      box-shadow: var(--shadow-lg);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffe4e6;
      border: 1px solid #fecdd3;
      padding: 6px 18px;
      border-radius: 30px;
      margin-bottom: 24px;
    }
    .badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.2);
    }
    .hero-badge-text {
      color: var(--deep-red);
      font-weight: 700;
      font-size: 0.88rem;
      letter-spacing: 0.5px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      color: #991b1b;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      max-width: 860px;
      margin: 0 auto 36px;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main-hero {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: linear-gradient(135deg, #e11d48 0%, #b91c1c 100%);
      color: #ffffff;
      font-size: 1.12rem;
      font-weight: 700;
      padding: 15px 36px;
      border-radius: 12px;
      box-shadow: 0 8px 24px rgba(225, 29, 72, 0.35);
      border: none;
      cursor: pointer;
    }
    .btn-main-hero:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(225, 29, 72, 0.45);
      color: #ffffff;
    }
    .btn-sub-hero {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      color: var(--deep-red);
      font-size: 1.05rem;
      font-weight: 700;
      padding: 14px 30px;
      border-radius: 12px;
      border: 2px solid #fecdd3;
      box-shadow: var(--shadow-sm);
    }
    .btn-sub-hero:hover {
      background: #fff1f2;
      border-color: #fda4af;
      transform: translateY(-2px);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1020px;
      margin: 0 auto;
      border-top: 1px solid #fed7aa;
      padding-top: 36px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 20px;
      border-radius: 12px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #fecdd3;
    }
    .stat-value {
      font-size: 1.85rem;
      font-weight: 900;
      color: var(--deep-red);
      margin-bottom: 4px;
      line-height: 1.2;
    }
    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    /* 公共区段骨架 */
    .section-spacing {
      padding: 72px 0;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }
    .section-kicker {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 800;
      text-transform: uppercase;
      color: var(--primary-red);
      letter-spacing: 1.5px;
      background: #ffe4e6;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
    }
    .section-heading {
      font-size: 2.1rem;
      font-weight: 800;
      color: #881337;
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    /* 卡片体系 */
    .grid-col-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-col-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-col-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-light);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #fda4af;
    }
    .feature-icon-bar {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background: linear-gradient(135deg, #ffe4e6 0%, #fecdd3 100%);
      color: var(--deep-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: bold;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.28rem;
      font-weight: 700;
      color: #9f1239;
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    /* 平台介绍大板块 */
    .platform-wrap {
      background: #ffffff;
      border-radius: 20px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 48px;
    }
    .platform-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 44px;
      align-items: center;
    }
    .platform-content h3 {
      font-size: 1.8rem;
      font-weight: 800;
      color: #881337;
      margin-bottom: 18px;
      line-height: 1.35;
    }
    .platform-content p {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 22px;
      line-height: 1.7;
    }
    .feature-checklist {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 28px;
    }
    .feature-checklist li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.92rem;
      color: #374151;
      font-weight: 600;
    }
    .check-mark {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #ffe4e6;
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      flex-shrink: 0;
    }
    .platform-image-box {
      background: linear-gradient(135deg, #fff1f2 0%, #fee2e2 100%);
      border-radius: 16px;
      padding: 16px;
      border: 1px solid #fecdd3;
      text-align: center;
    }
    .platform-image-box img {
      width: 100%;
      height: auto;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      display: block;
    }
    /* 场景矩阵列表 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .scene-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 22px;
      transition: var(--transition);
      display: flex;
      gap: 16px;
    }
    .scene-item:hover {
      border-color: #f87171;
      box-shadow: var(--shadow-sm);
      transform: translateY(-3px);
    }
    .scene-tag {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: #fff1f2;
      color: var(--deep-red);
      font-weight: bold;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 1rem;
    }
    .scene-text h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #9f1239;
      margin-bottom: 6px;
    }
    .scene-text p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    /* 模型生态标签云 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid #fecdd3;
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #9f1239;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .model-pill:hover {
      background: #ffe4e6;
      border-color: var(--primary-red);
      transform: scale(1.05);
    }
    /* 对比评测表格与卡片 */
    .rating-highlight {
      background: linear-gradient(135deg, #fff1f2 0%, #ffffff 100%);
      border: 2px solid #fecdd3;
      border-radius: 16px;
      padding: 32px;
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .rating-meta h3 {
      font-size: 1.5rem;
      font-weight: 800;
      color: #881337;
      margin-bottom: 6px;
    }
    .rating-meta p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .score-num {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--deep-red);
      line-height: 1;
    }
    .score-total {
      font-size: 1.2rem;
      font-weight: 700;
      color: #9ca3af;
    }
    .stars-icon {
      color: #e11d48;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }
    .compare-table-container {
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-light);
      overflow-x: auto;
      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: 18px 24px;
      border-bottom: 1px solid #fee2e2;
    }
    .compare-table th {
      background: #fff5f5;
      font-weight: 700;
      color: #881337;
      font-size: 0.98rem;
    }
    .compare-table th.col-highlight, .compare-table td.col-highlight {
      background: #fff1f2;
      color: #9f1239;
      font-weight: 700;
    }
    .compare-table tr:hover td {
      background: #fffafa;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    /* 步骤流程 */
    .workflow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .workflow-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 28px 20px;
      text-align: center;
      position: relative;
      transition: var(--transition);
    }
    .workflow-card:hover {
      border-color: #f87171;
      transform: translateY(-4px);
    }
    .step-number {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1.1rem;
    }
    .workflow-card h4 {
      font-size: 1.12rem;
      font-weight: 700;
      color: #881337;
      margin-bottom: 8px;
    }
    .workflow-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }
    /* 用户评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 14px;
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .review-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
      border-color: #fda4af;
    }
    .review-stars {
      color: #e11d48;
      font-size: 0.9rem;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 0.92rem;
      color: #374151;
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #fecdd3;
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #ffe4e6;
      color: var(--deep-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.05rem;
    }
    .reviewer-meta h5 {
      font-size: 0.92rem;
      font-weight: 700;
      color: #111827;
    }
    .reviewer-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    /* 案例展示区 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .case-img-box {
      width: 100%;
      height: 240px;
      background: #fee2e2;
      overflow: hidden;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .case-card:hover .case-img-box img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 24px;
    }
    .case-body h4 {
      font-size: 1.2rem;
      font-weight: 700;
      color: #881337;
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }
    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-header {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 20px 24px;
      font-size: 1.02rem;
      font-weight: 700;
      color: #1f2937;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }
    .faq-header:hover {
      background: #fff5f5;
      color: var(--primary-red);
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary-red);
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
      background: #ffffff;
    }
    .faq-content {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #fecdd3;
      padding-top: 14px;
    }
    /* 表单与联系板块 */
    .contact-card-box {
      background: #ffffff;
      border-radius: 20px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-lg);
      padding: 44px;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
    }
    .contact-info-col h3 {
      font-size: 1.8rem;
      font-weight: 800;
      color: #881337;
      margin-bottom: 16px;
    }
    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 28px;
    }
    .contact-methods {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 28px;
    }
    .method-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: #374151;
    }
    .method-badge {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: #ffe4e6;
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 0.9rem;
    }
    .qr-box-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
      background: #fff5f5;
      padding: 16px 20px;
      border-radius: 12px;
      border: 1px dashed #fda4af;
    }
    .qr-img {
      width: 100px;
      height: 100px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      background: #ffffff;
      display: block;
    }
    .qr-meta h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--deep-red);
      margin-bottom: 4px;
    }
    .qr-meta p {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 0;
    }
    .form-container {
      background: #fffcfc;
      border: 1px solid #fee2e2;
      border-radius: 14px;
      padding: 32px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: #374151;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      font-size: 0.95rem;
      color: #1f2937;
      background: #ffffff;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }
    .btn-submit-form {
      width: 100%;
      background: linear-gradient(135deg, var(--primary-red) 0%, var(--deep-red) 100%);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(211, 47, 47, 0.25);
      transition: var(--transition);
    }
    .btn-submit-form:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(211, 47, 47, 0.35);
    }
    /* 资讯与友情链接列表 */
    .news-card-wrap {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-light);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .news-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .news-list li {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid #fee2e2;
      padding-bottom: 12px;
    }
    .news-list li:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }
    .news-link {
      font-size: 0.95rem;
      color: #374151;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .news-link:hover {
      color: var(--primary-red);
    }
    .news-date {
      font-size: 0.85rem;
      color: #9ca3af;
    }
    .friendly-links-wrap {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 20px 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      margin-top: 40px;
    }
    .fl-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: #881337;
      margin-right: 6px;
    }
    .friendly-links-wrap a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #fff1f2;
      padding: 4px 12px;
      border-radius: 6px;
      border: 1px solid #fee2e2;
    }
    .friendly-links-wrap a:hover {
      color: var(--primary-red);
      border-color: #f87171;
      background: #ffe4e6;
    }
    /* 页脚 */
    .site-footer {
      background: #1e1e24;
      color: #e5e7eb;
      padding: 56px 0 28px;
      margin-top: 72px;
      border-top: 4px solid var(--primary-red);
    }
    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
      border-left: 3px solid var(--primary-red);
      padding-left: 10px;
    }
    .footer-col p {
      font-size: 0.88rem;
      color: #9ca3af;
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col ul li a {
      color: #9ca3af;
      font-size: 0.88rem;
    }
    .footer-col ul li a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .footer-bottom-bar {
      border-top: 1px solid #374151;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #9ca3af;
    }
    /* 浮动组件与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      border: 1px solid #fecdd3;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-red);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary-red);
      color: #ffffff;
      transform: scale(1.1);
    }
    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .grid-col-3, .scene-grid, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-col-4, .hero-stats-grid, .workflow-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .platform-grid, .contact-card-box, .cases-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 2px solid var(--border-light);
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-box {
        padding: 36px 20px;
      }
      .grid-col-3, .grid-col-2, .scene-grid, .review-grid, .workflow-grid, .footer-top-grid, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .contact-card-box {
        padding: 24px;
      }
      .platform-wrap {
        padding: 24px;
      }
      .feature-checklist {
        grid-template-columns: 1fr;
      }
    }