/* CSS Reset & Variables - 桃红艳丽风 (Rose Pink Tech) */
    :root {
      --primary: #e11d48;
      --primary-hover: #be123c;
      --primary-light: #ffe4e6;
      --primary-soft: #fff1f2;
      --accent: #f43f5e;
      --accent-glow: rgba(244, 63, 94, 0.25);
      --text-dark: #0f172a;
      --text-muted: #475569;
      --text-subtle: #64748b;
      --bg-main: #fdfafb;
      --bg-card: #ffffff;
      --border-color: #fecdd3;
      --border-soft: #ffe4e6;
      --shadow-sm: 0 2px 8px rgba(225, 29, 72, 0.04);
      --shadow-md: 0 8px 24px rgba(225, 29, 72, 0.08);
      --shadow-lg: 0 16px 36px rgba(225, 29, 72, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

    ul, ol {
      list-style: none;
    }

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

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

    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background: linear-gradient(180deg, #fff1f2 0%, #fff 100%);
    }

    /* Section Header */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-soft);
      border: 1px solid var(--border-color);
      padding: 4px 14px;
      border-radius: 30px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.35;
      margin-bottom: 14px;
    }

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

    /* Header & Navigation */
    .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-soft);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格符合规则要求 */
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 13px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: 6px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px var(--accent-glow);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      box-shadow: 0 6px 20px rgba(225, 29, 72, 0.35);
      transform: translateY(-1px);
    }

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

    .btn-outline:hover {
      background: var(--primary-soft);
      border-color: var(--primary);
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* Hero Section (首屏绝对无图片) */
    .hero-section {
      padding: 80px 0 90px;
      background: radial-gradient(circle at 80% 20%, #ffe4e6 0%, #fff1f2 40%, #ffffff 80%);
      border-bottom: 1px solid var(--border-soft);
      position: relative;
      overflow: hidden;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 30px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
      animation: pulse-dot 1.8s infinite;
    }

    @keyframes pulse-dot {
      0% { transform: scale(0.9); opacity: 0.8; }
      50% { transform: scale(1.3); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.8; }
    }

    .hero-badge-text {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    /* H1 字数严格控制在20字内 */
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-dark);
      letter-spacing: -1px;
      line-height: 1.25;
      margin-bottom: 20px;
    }

    .hero-title-highlight {
      color: var(--primary);
      background: linear-gradient(135deg, #e11d48, #f43f5e);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 34px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
      line-height: 1.6;
    }

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

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 16px;
      border-radius: 10px;
    }

    /* 首屏纯 CSS 构造的科技指标矩阵 */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 900px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      padding: 20px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .stat-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

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

    .stat-label {
      font-size: 13px;
      color: var(--text-subtle);
      font-weight: 600;
    }

    /* 平台介绍 & 核心能力 */
    .platform-intro-card {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
    }

    .feature-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
    }

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

    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-soft);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary);
      margin-bottom: 18px;
      border: 1px solid var(--border-color);
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵与标签云 */
    .model-tags-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-dark);
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    /* 场景矩阵多列网格 */
    .scene-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .scene-item {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scene-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .scene-name {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

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

    /* 对比评测专属板块 */
    .eval-score-banner {
      background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-badge-wrap {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .eval-star-icon {
      font-size: 32px;
      color: #f59e0b;
    }

    .eval-score-text {
      font-size: 36px;
      font-weight: 900;
      color: var(--primary);
    }

    .eval-score-sub {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 600;
    }

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

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

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

    .custom-table th {
      background-color: var(--primary-soft);
      color: var(--text-dark);
      font-weight: 700;
    }

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

    .highlight-col {
      background-color: rgba(255, 241, 242, 0.4);
      font-weight: 700;
      color: var(--primary);
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      box-shadow: var(--shadow-sm);
    }

    .step-title {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-dark);
    }

    .step-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例中心 (宣传图与素材图按规则使用) */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

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

    .case-banner-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-media-row {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
    }

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

    .media-card-body {
      padding: 18px;
    }

    .media-card-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-dark);
    }

    .media-card-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 用户评论卡片 6条 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

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

    .review-content {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-soft);
      padding-top: 12px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .review-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
    }

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

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.28s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      background: #ffffff;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 22px 18px;
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-group-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-dark);
      background: #ffffff;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

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

    /* 资讯板块 */
    .article-box {
      background: #ffffff;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

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

    .article-link-tag {
      background: var(--primary-soft);
      border: 1px solid var(--border-color);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .article-link-tag:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 加盟代理与算力分销 */
    .agent-banner {
      background: linear-gradient(135deg, #e11d48 0%, #f43f5e 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      flex-wrap: wrap;
    }

    .agent-title {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 10px;
      color: #ffffff;
    }

    .agent-desc {
      font-size: 15px;
      opacity: 0.95;
      max-width: 600px;
      line-height: 1.6;
    }

    /* 友情链接与底部导航 */
    .footer-section {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-dark);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 12px;
      line-height: 1.6;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a,
    .footer-col ul li {
      font-size: 13px;
      color: var(--text-muted);
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

    .friend-links-box {
      border-top: 1px solid var(--border-soft);
      padding-top: 20px;
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .friend-links-box a {
      color: var(--text-subtle);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-soft);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: var(--text-subtle);
    }

    /* 悬浮客服面板 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(225, 29, 72, 0.4);
      cursor: pointer;
      font-size: 20px;
      transition: var(--transition);
      border: none;
      position: relative;
    }

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

    .floating-card-qr {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      display: none;
      width: 150px;
      text-align: center;
    }

    .floating-card-qr img {
      width: 100%;
      border-radius: 6px;
      margin-bottom: 6px;
    }

    .floating-card-qr span {
      font-size: 12px;
      font-weight: 700;
      color: var(--text-dark);
      display: block;
    }

    .floating-btn:hover .floating-card-qr {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title { font-size: 32px; }
      .feature-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .scene-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(3, 1fr); }
      .case-gallery-grid { grid-template-columns: 1fr; }
      .case-media-row { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-soft);
      }
      .nav-links.show { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; padding: 10px 14px; }
    }

    @media (max-width: 576px) {
      .hero-title { font-size: 26px; }
      .section-title { font-size: 24px; }
      .feature-grid-3 { grid-template-columns: 1fr; }
      .scene-grid-4 { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr; }
      .form-group-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .agent-banner { padding: 24px; text-align: center; justify-content: center; }
    }