/* roulang page: index */
:root {
      --primary-purple: #6C3CEC;
      --primary-coral: #FF6B4A;
      --deep-indigo: #1E1B4B;
      --bg-light: #F9F7FD;
      --gray-border: #E2DFE9;
      --gray-light: #F3F1F6;
      --gray-text: #6B6B7B;
      --dark-bg: #1A1A1A;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --card-shadow-hover: 0 12px 30px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
      --border-radius-card: 24px;
      --border-radius-btn: 50px;
      --border-radius-input: 12px;
      --transition-base: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--white);
      color: #2A2A3C;
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      color: var(--deep-indigo);
      font-weight: 600;
    }
    a {
      text-decoration: none;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 自定义容器微调 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航重塑 */
    .navbar {
      background-color: var(--white);
      border-bottom: 1px solid #EEEEEE;
      padding: 12px 0;
      box-shadow: none;
    }
    .navbar-brand {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    .brand-lewin {
      color: var(--primary-purple);
    }
    .brand-le {
      color: var(--deep-indigo);
    }
    .nav-link {
      color: #4A4A5A !important;
      font-size: 15px;
      font-weight: 500;
      letter-spacing: 0.5px;
      margin: 0 12px;
      padding: 8px 4px !important;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary-purple) !important;
    }
    .nav-link.active {
      color: var(--primary-purple) !important;
      font-weight: 600;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 4px;
      right: 4px;
      height: 2px;
      background-color: var(--primary-purple);
      border-radius: 2px;
    }
    .navbar-toggler {
      border: none;
      padding: 4px 8px;
      box-shadow: none;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    .offcanvas {
      background-color: var(--white);
    }
    .offcanvas .nav-link {
      font-size: 18px;
      margin: 8px 0;
      padding: 12px 16px !important;
    }
    /* 按钮系统 */
    .btn-primary-gradient {
      background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-coral) 100%);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(108,60,236,0.25);
      letter-spacing: 0.4px;
    }
    .btn-primary-gradient:hover {
      background: linear-gradient(135deg, var(--primary-coral) 0%, var(--primary-purple) 100%);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(108,60,236,0.35);
      color: white;
    }
    .btn-outline-purple {
      background: transparent;
      border: 2px solid var(--primary-purple);
      color: var(--primary-purple);
      font-weight: 600;
      padding: 12px 34px;
      border-radius: var(--border-radius-btn);
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-outline-purple:hover {
      background: var(--primary-purple);
      color: white;
      transform: translateY(-2px);
    }
    /* 卡片系统 */
    .card-custom {
      background: var(--white);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      height: 100%;
      border: none;
      background-color: #F9F7FD;
    }
    .card-custom:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-card {
      background: var(--white);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .icon-bg-gradient {
      width: 56px;
      height: 56px;
      border-radius: 16px;
      background: linear-gradient(135deg, rgba(108,60,236,0.12) 0%, rgba(255,107,74,0.12) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-purple);
      font-size: 24px;
    }
    .badge-pill-custom {
      background: #F3F1F6;
      color: #6B6B7B;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 500;
      display: inline-block;
      margin: 3px 3px;
    }
    .data-badge {
      background: #F3EDFF;
      border-radius: 40px;
      padding: 8px 18px;
      display: inline-flex;
      align-items: center;
      font-weight: 600;
      color: var(--deep-indigo);
      margin: 0 6px;
    }
    .data-badge .num {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-purple);
      margin-right: 4px;
    }
    /* Hero 图片容器 */
    .hero-img-container {
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      background: #f0eafc;
    }
    /* 对比区域 */
    .compare-section {
      background: linear-gradient(135deg, rgba(108,60,236,0.03) 0%, rgba(255,107,74,0.04) 100%);
      border-radius: 40px;
      padding: 40px 20px;
    }
    .vs-badge {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-coral));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 20px;
      box-shadow: 0 8px 20px rgba(108,60,236,0.3);
    }
    .compare-item {
      display: flex;
      align-items: center;
      margin-bottom: 18px;
      font-size: 16px;
    }
    .dot-gray {
      width: 10px;
      height: 10px;
      background: #C2C2CC;
      border-radius: 50%;
      margin-right: 12px;
    }
    .dot-purple {
      width: 10px;
      height: 10px;
      background: var(--primary-purple);
      border-radius: 50%;
      margin-right: 12px;
    }
    .value-highlight {
      font-size: 28px;
      font-weight: 700;
      margin-left: 8px;
    }
    /* FAQ 手风琴 */
    .accordion-item {
      border: none;
      border-bottom: 1px solid #E2DFE9;
      background: transparent;
    }
    .accordion-button {
      background: transparent;
      font-weight: 500;
      font-size: 18px;
      color: var(--deep-indigo);
      padding: 20px 16px;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--primary-purple);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .accordion-body {
      padding: 0 30px 20px 30px;
      line-height: 1.8;
      color: #4A4A5A;
      border-left: 3px solid var(--primary-purple);
      margin-left: 16px;
    }
    .accordion-button::after {
      background-image: none;
      content: "+";
      font-size: 22px;
      font-weight: 400;
      color: var(--primary-purple);
      width: auto;
      height: auto;
      line-height: 1;
    }
    .accordion-button:not(.collapsed)::after {
      background-image: none;
      content: "−";
      color: var(--primary-purple);
    }
    /* 表单 */
    .form-control-custom {
      border: 1px solid #E2DFE9;
      background: #F9F7FD;
      border-radius: 12px;
      padding: 14px 18px;
      transition: 0.2s;
      font-size: 16px;
    }
    .form-control-custom:focus {
      border-color: var(--primary-purple);
      box-shadow: 0 0 0 3px rgba(108,60,236,0.15);
      background: white;
    }
    /* 页脚 */
    .footer-custom {
      background: #1A1A1A;
      color: #999999;
      padding: 40px 0;
      font-size: 15px;
    }
    .footer-custom a {
      color: #BBBBBB;
      margin-left: 24px;
    }
    .footer-custom a:hover {
      color: white;
    }
    /* 响应式 */
    @media (max-width: 768px) {
      h1 {
        font-size: 38px !important;
      }
      h2 {
        font-size: 30px !important;
      }
      .navbar-collapse {
        background: white;
      }
      .data-badge .num {
        font-size: 26px;
      }
      .hero-img-container {
        margin-top: 30px;
      }
    }
    section {
      padding-top: 80px;
      padding-bottom: 80px;
    }