:root {
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --neon-lime: #10b981;
      --accent-grad: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);
      --card-border: rgba(139, 92, 246, 0.16);
      --card-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.08);
      --neon-glow: 0 0 20px rgba(6, 182, 212, 0.25);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: 
        radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.04) 0%, transparent 50%);
      pointer-events: none;
      z-index: -1;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
      width: 100%;
    }

    .section-padding {
      padding: 80px 0;
    }

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

    .badge-neon {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      background: rgba(139, 92, 246, 0.1);
      border: 1px solid rgba(139, 92, 246, 0.3);
      color: #7c3aed;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
      position: relative;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(139, 92, 246, 0.15);
      transition: var(--transition);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-area .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      background: var(--accent-grad);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a, .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .nav-links li a:hover, .nav-links a:hover {
      color: #7c3aed;
      background: rgba(139, 92, 246, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      text-decoration: none;
      border-radius: var(--radius-md);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      line-height: 1;
    }

    .btn-neon {
      background: var(--accent-grad);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(139, 92, 246, 0.35);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid rgba(139, 92, 246, 0.3);
    }

    .btn-outline:hover {
      border-color: #7c3aed;
      color: #7c3aed;
      background: rgba(139, 92, 246, 0.05);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 70px;
      position: relative;
      text-align: center;
      background: radial-gradient(circle at center top, rgba(6, 182, 212, 0.12) 0%, rgba(248, 250, 252, 0) 70%);
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      background: var(--accent-grad);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      position: relative;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 35px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-actions .btn-lg {
      padding: 15px 34px;
      font-size: 1.05rem;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 26px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
    }

    .stat-item {
      text-align: center;
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: #7c3aed;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 模块通用卡片 */
    .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: 30px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--accent-grad);
      opacity: 0;
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 36px -10px rgba(139, 92, 246, 0.2);
    }

    .card:hover::before {
      opacity: 1;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(139, 92, 246, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-size: 1.4rem;
      color: #7c3aed;
    }

    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台支持模型标签 */
    .model-tag-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid rgba(139, 92, 246, 0.25);
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: #06b6d4;
      background: rgba(6, 182, 212, 0.08);
      color: #0891b2;
      transform: translateY(-1px);
    }

    /* 对比评测表格与卡片 */
    .evaluation-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--card-border);
      padding: 35px;
      box-shadow: var(--card-shadow);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
      padding: 20px 28px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      border-left: 4px solid #7c3aed;
    }

    .rating-left {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 900;
      color: #7c3aed;
    }

    .rating-meta {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .eval-table-wrapper {
      overflow-x: auto;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .eval-table th, .eval-table td {
      padding: 14px 18px;
      border-bottom: 1px solid #e2e8f0;
      font-size: 0.95rem;
    }

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

    .eval-table td:nth-child(2) {
      color: #7c3aed;
      font-weight: 700;
      background: rgba(139, 92, 246, 0.03);
    }

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

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

    .step-badge {
      display: inline-block;
      width: 32px;
      height: 32px;
      line-height: 32px;
      text-align: center;
      background: var(--accent-grad);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      margin-bottom: 14px;
    }

    /* 案例展示 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }

    .media-card-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .media-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-card-img img {
      transform: scale(1.04);
    }

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

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

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

    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
      user-select: none;
    }

    .faq-question:hover {
      color: #7c3aed;
    }

    .faq-arrow {
      font-size: 0.8rem;
      transition: transform 0.3s ease;
      color: var(--text-light);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 22px 18px;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: #7c3aed;
    }

    /* 需求匹配表单 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: #8b5cf6;
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    }

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

    /* 文章列表 & 友情链接 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      padding: 14px 18px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.92rem;
      font-weight: 600;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: #8b5cf6;
      color: #7c3aed;
      padding-left: 22px;
    }

    /* 底部区域 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid #e2e8f0;
      padding: 60px 0 30px;
      color: var(--text-muted);
      position: relative;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand .ai-page-logo {
      height: 36px;
      width: auto;
      margin-bottom: 16px;
    }

    .footer-desc {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .footer-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #7c3aed;
    }

    .qr-card {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .qr-card img {
      width: 110px;
      height: 110px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      padding: 4px;
      background: #ffffff;
    }

    .friend-links-bar {
      border-top: 1px solid #e2e8f0;
      padding-top: 24px;
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      font-size: 0.85rem;
    }

    .friend-links-bar a {
      color: var(--text-light);
      text-decoration: none;
      transition: var(--transition);
    }

    .friend-links-bar a:hover {
      color: #7c3aed;
    }

    .copyright-bar {
      border-top: 1px solid #e2e8f0;
      margin-top: 20px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      background: #ffffff;
      padding: 10px 14px;
      border-radius: 50px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
      border: 1px solid rgba(139, 92, 246, 0.3);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 0.85rem;
      transition: var(--transition);
    }

    .float-kefu:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(139, 92, 246, 0.3);
      border-color: #8b5cf6;
    }

    .float-kefu-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        display: none;
        border-bottom: 1px solid #e2e8f0;
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 0;
      }
      .nav-links li, .nav-links a {
        width: 100%;
        text-align: center;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats {
        grid-template-columns: 1fr;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .steps-timeline {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        gap: 14px;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }