/* ----- 全局重置 & 基础变量 ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --bg-deep: #0a0612;
      --bg-dark: #130b1f;
      --bg-card: #1c112b;
      --primary: #e033ff;
      --primary-light: #f56bff;
      --secondary: #7b2fbe;
      --accent: #00e0ff;
      --text-main: #f0e6ff;
      --text-muted: #b8a6d9;
      --text-dark: #3c2a4d;
      --border-glow: rgba(224, 51, 255, 0.45);
      --shadow-glow: 0 0 25px rgba(224, 51, 255, 0.3);
      --shadow-soft: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
      --radius-card: 20px;
      --radius-btn: 60px;
      --transition: 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
      --font: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font);
      background: radial-gradient(circle at 20% 10%, #1e0a2b 0%, var(--bg-deep) 55%);
      color: var(--text-main);
      line-height: 1.6;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      overflow-x: hidden;
    }

    /* 统一容器宽度 */
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 所有区块默认上下留白均匀 */
    section {
      padding: 64px 0;
      position: relative;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 2.8rem;
      color: #fff;
      text-shadow: 0 0 20px var(--primary), 0 0 40px rgba(224, 51, 255, 0.5);
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 16px;
      color: #fff;
      display: inline-block;
    }

    h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      border-radius: 4px;
      margin-top: 8px;
    }

    h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    p {
      color: var(--text-muted);
      font-size: 1.05rem;
    }

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

    a:hover {
      color: var(--primary-light);
    }

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

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition);
      border: none;
      text-align: center;
      line-height: 1.4;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(110deg, var(--primary), #a72cff);
      color: #fff;
      box-shadow: 0 0 15px rgba(224, 51, 255, 0.5), 0 8px 20px -8px #000;
    }

    .btn-primary:hover {
      background: linear-gradient(110deg, #f56bff, #c04dff);
      box-shadow: 0 0 30px rgba(224, 51, 255, 0.9), 0 12px 25px -8px #000;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary-light);
    }

    .btn-outline:hover {
      background: rgba(224, 51, 255, 0.12);
      border-color: var(--primary-light);
      color: #fff;
      box-shadow: var(--shadow-glow);
    }

    /* 卡片基础 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      border: 1px solid rgba(224, 51, 255, 0.15);
      padding: 28px;
      transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
    }

    .card:hover {
      transform: translateY(-6px);
      border-color: var(--border-glow);
      box-shadow: var(--shadow-glow), var(--shadow-soft);
    }

    /* ---------- 顶部导航 ---------- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 6, 18, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(224, 51, 255, 0.2);
      padding: 8px 0;
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 8px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand .ai-page-logo {
      max-height: 40px;
      width: auto;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.94rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: #fff;
      background: rgba(224, 51, 255, 0.12);
      border-radius: 20px;
    }

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

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 1px solid var(--primary);
      color: #fff;
      font-size: 1.5rem;
      padding: 4px 12px;
      border-radius: 8px;
      cursor: pointer;
    }

    /* ---------- Hero 首屏 (无图片) ---------- */
    .hero {
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      left: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(224, 51, 255, 0.18) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-content {
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(224, 51, 255, 0.18);
      border: 1px solid rgba(224, 51, 255, 0.5);
      border-radius: 40px;
      padding: 6px 18px;
      font-size: 0.85rem;
      color: var(--primary-light);
      margin-bottom: 24px;
      letter-spacing: 0.04em;
    }

    .hero h1 {
      margin-bottom: 24px;
      font-size: 3.4rem;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #eab5ff, #b77aff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      text-shadow: none;
    }

    .hero p {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 60px;
    }

    /* 首屏数据指标卡片 */
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 900px;
      margin: 0 auto;
    }

    .stat-item {
      background: rgba(28, 17, 43, 0.7);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(224, 51, 255, 0.25);
      border-radius: 40px;
      padding: 22px 10px;
      text-align: center;
      transition: all var(--transition);
    }

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

    .stat-number {
      display: block;
      font-size: 2.2rem;
      font-weight: 800;
      color: #fff;
      line-height: 1.2;
      background: linear-gradient(135deg, #fff, #f0b5ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    /* ---------- 通用区块标题 ---------- */
    .section-header {
      margin-bottom: 40px;
      text-align: center;
    }

    .section-header p {
      max-width: 650px;
      margin: 0 auto;
      font-size: 1.1rem;
    }

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

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

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

    /* 服务能力卡片 */
    .service-card {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(224, 51, 255, 0.15);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--primary-light);
      border: 1px solid rgba(224, 51, 255, 0.3);
    }

    .service-card h3 {
      color: #fff;
      font-size: 1.25rem;
    }

    .service-card p {
      font-size: 0.95rem;
      flex: 1;
    }

    /* 流程步骤 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      counter-reset: step;
    }

    .step-item {
      flex: 1 1 180px;
      background: var(--bg-card);
      border-radius: 30px;
      padding: 30px 20px;
      text-align: center;
      border: 1px solid rgba(224, 51, 255, 0.15);
      position: relative;
      counter-increment: step;
      transition: all var(--transition);
    }

    .step-item::before {
      content: counter(step, decimal-leading-zero);
      font-size: 2.4rem;
      font-weight: 800;
      color: rgba(224, 51, 255, 0.3);
      position: absolute;
      top: 10px;
      right: 18px;
      line-height: 1;
    }

    .step-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .step-item h3 {
      margin: 14px 0 8px;
      font-size: 1.2rem;
      color: #fff;
    }

    /* 对比表格 */
    .compare-table-wrap {
      overflow-x: auto;
      border-radius: 24px;
      border: 1px solid rgba(224, 51, 255, 0.2);
      background: var(--bg-card);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
    }

    .compare-table th,
    .compare-table td {
      padding: 18px 24px;
      text-align: left;
      border-bottom: 1px solid rgba(224, 51, 255, 0.1);
      color: var(--text-main);
    }

    .compare-table th {
      background: rgba(224, 51, 255, 0.12);
      font-weight: 700;
      color: #fff;
      font-size: 1rem;
    }

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

    .compare-table .highlight {
      color: var(--primary-light);
      font-weight: 700;
    }

    .rating-stars {
      display: inline-flex;
      gap: 4px;
      font-size: 1.3rem;
      color: #ffcc00;
      letter-spacing: 2px;
    }

    .score-badge {
      display: inline-block;
      background: linear-gradient(135deg, var(--primary), #a72cff);
      border-radius: 30px;
      padding: 4px 16px;
      font-weight: 700;
      color: #fff;
      font-size: 0.9rem;
    }

    /* ---------- 案例展示 & 素材图片使用 ---------- */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-item {
      border-radius: 24px;
      overflow: hidden;
      background: var(--bg-card);
      border: 1px solid rgba(224, 51, 255, 0.15);
      transition: all var(--transition);
    }

    .case-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16/10;
      object-fit: cover;
      display: block;
    }

    .case-content {
      padding: 20px;
    }

    .case-content h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: #fff;
    }

    .case-content p {
      font-size: 0.9rem;
    }

    /* ---------- 用户评论 ---------- */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      border-radius: 24px;
      padding: 24px;
      border: 1px solid rgba(224, 51, 255, 0.15);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }

    .review-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 14px;
    }

    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #1a0b24;
      font-size: 1.2rem;
    }

    .review-name {
      font-weight: 700;
      color: #fff;
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-stars {
      color: #ffcc00;
      font-size: 0.9rem;
      letter-spacing: 2px;
      margin-bottom: 8px;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex: 1;
    }

    /* ---------- FAQ 折叠面板 ---------- */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: 20px;
      border: 1px solid rgba(224, 51, 255, 0.15);
      overflow: hidden;
      transition: border-color var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
    }

    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      user-select: none;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.05rem;
      font-family: var(--font);
    }

    .faq-question::after {
      content: '+';
      font-size: 1.6rem;
      color: var(--primary);
      transition: transform var(--transition);
    }

    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      padding: 0 28px;
      color: var(--text-muted);
      font-size: 0.98rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 28px 24px;
    }

    /* ---------- 表格 & Token 比价 ---------- */
    .token-table {
      width: 100%;
      border-collapse: collapse;
      background: var(--bg-card);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(224, 51, 255, 0.2);
    }

    .token-table th,
    .token-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid rgba(224, 51, 255, 0.1);
      color: var(--text-main);
    }

    .token-table th {
      background: rgba(224, 51, 255, 0.1);
      color: #fff;
    }

    .token-price {
      color: var(--accent);
      font-weight: 700;
    }

    /* ---------- 表单 ---------- */
    .form-card {
      max-width: 760px;
      margin: 0 auto;
      background: var(--bg-card);
      border-radius: 32px;
      padding: 40px;
      border: 1px solid rgba(224, 51, 255, 0.2);
      box-shadow: var(--shadow-soft);
    }

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

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 6px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 14px 18px;
      background: rgba(10, 6, 18, 0.8);
      border: 1px solid rgba(224, 51, 255, 0.25);
      border-radius: 16px;
      color: #fff;
      font-size: 0.95rem;
      font-family: var(--font);
      transition: border-color var(--transition), box-shadow var(--transition);
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      outline: none;
      box-shadow: 0 0 0 3px rgba(224, 51, 255, 0.25);
    }

    .form-group textarea {
      min-height: 120px;
      resize: vertical;
    }

    /* ---------- 底部 ---------- */
    .site-footer {
      margin-top: 40px;
      background: #0d0716;
      border-top: 1px solid rgba(224, 51, 255, 0.2);
      padding: 48px 0 24px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 36px;
    }

    .footer-brand p {
      margin: 12px 0;
      font-size: 0.9rem;
    }

    .footer-col h4 {
      color: #fff;
      margin-bottom: 16px;
      font-size: 1rem;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(224, 51, 255, 0.15);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      gap: 12px;
    }

    .footer-bottom a {
      color: var(--text-muted);
    }

    /* ---------- 浮动客服 ---------- */
    .float-kefu {
      position: fixed;
      bottom: 30px;
      right: 24px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), #a72cff);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.5rem;
      box-shadow: 0 0 20px rgba(224, 51, 255, 0.7);
      cursor: pointer;
      transition: all var(--transition);
      border: none;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.1);
      box-shadow: 0 0 40px rgba(224, 51, 255, 1);
    }

    .kefu-pop {
      position: absolute;
      bottom: 70px;
      right: 0;
      background: var(--bg-card);
      border: 1px solid var(--primary);
      border-radius: 20px;
      padding: 20px;
      text-align: center;
      width: 180px;
      display: none;
      box-shadow: var(--shadow-soft);
    }

    .kefu-pop.show {
      display: block;
      animation: fadeIn 0.25s;
    }

    .kefu-pop img {
      width: 120px;
      margin: 0 auto 8px;
      border-radius: 12px;
    }

    .kefu-pop p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ---------- 滚动渐入 ---------- */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ---------- 标签云 ---------- */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .tag {
      background: rgba(224, 51, 255, 0.1);
      border: 1px solid rgba(224, 51, 255, 0.3);
      border-radius: 40px;
      padding: 8px 18px;
      font-size: 0.85rem;
      color: var(--text-muted);
      transition: all var(--transition);
    }

    .tag:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary-light);
      transform: translateY(-2px);
      box-shadow: var(--shadow-glow);
    }

    /* ---------- 响应式 ---------- */
    @media (max-width: 1024px) {
      h1 { font-size: 2.6rem; }
      .hero h1 { font-size: 2.8rem; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 0;
        gap: 4px;
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links li a {
        display: block;
        padding: 10px 16px;
        border-radius: 12px;
      }

      .mobile-menu-btn {
        display: block;
      }

      .hero h1 { font-size: 2.2rem; }
      .hero p { font-size: 1.1rem; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .grid-2, .grid-4, .review-grid, .case-grid { grid-template-columns: 1fr; }
      .step-item { flex: 1 1 100%; }
      .form-row { grid-template-columns: 1fr; }
      .form-card { padding: 28px 20px; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .btn { width: 100%; }
      .hero-actions .btn { width: auto; }
    }

    @media (max-width: 480px) {
      .hero-stats { grid-template-columns: 1fr 1fr; }
      h2 { font-size: 1.6rem; }
      .stat-number { font-size: 1.8rem; }
    }

    /* 隐藏辅助 */
    .visually-hidden {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      border: 0;
    }