/* roulang page: index */
:root {
      --primary-deep: #0D1117;
      --accent-cyan: #00F0FF;
      --secondary-gray: #8A94A6;
      --bg-white: #FFFFFF;
      --bg-light: #F4F5F7;
      --border-light: #E1E4E8;
      --surface-white: #FFFFFF;
      --shadow-hover: 0 8px 24px rgba(13, 17, 23, 0.08);
      --border-radius-sm: 4px;
      --border-radius-md: 8px;
      --transition-smooth: all 0.3s ease;
      --font-chinese: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-chinese);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.75;
      color: var(--secondary-gray);
      background-color: var(--bg-white);
      scroll-behavior: smooth;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .btn:focus-visible, a:focus-visible, input:focus-visible {
      outline: 2px solid var(--accent-cyan);
      outline-offset: 2px;
    }
    
    /* 导航栏 */
    .navbar-custom {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      height: 70px;
      padding: 0 1.5rem;
      transition: var(--transition-smooth);
    }
    
    .logo-text {
      font-weight: 900;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
    }
    
    .logo-wm {
      font-weight: 900;
    }
    
    .logo-cn {
      font-weight: 300;
      margin-left: 2px;
    }
    
    .logo-icon {
      color: var(--accent-cyan);
      margin-right: 6px;
      font-size: 1.5rem;
    }
    
    .nav-link-custom {
      color: var(--primary-deep) !important;
      font-weight: 500;
      margin: 0 0.75rem;
      padding: 0.5rem 0 !important;
      position: relative;
      transition: var(--transition-smooth);
    }
    
    .nav-link-custom:hover {
      color: var(--accent-cyan) !important;
    }
    
    .nav-link-custom.active {
      color: var(--accent-cyan) !important;
    }
    
    .search-icon {
      color: var(--secondary-gray);
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition-smooth);
      background: transparent;
      border: none;
    }
    
    .search-icon:hover {
      color: var(--accent-cyan);
    }
    
    .login-btn {
      color: var(--secondary-gray);
      font-weight: 500;
      margin-right: 0.75rem;
      background: transparent;
      border: none;
      transition: var(--transition-smooth);
    }
    
    .login-btn:hover {
      color: var(--primary-deep);
    }
    
    .btn-start {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--border-radius-sm);
      padding: 0.5rem 1.5rem;
      height: 40px;
      display: flex;
      align-items: center;
      border: none;
      letter-spacing: 0.05em;
      transition: var(--transition-smooth);
    }
    
    .btn-start:hover {
      background: #00D4E0;
      color: var(--primary-deep);
    }
    
    /* 板块通用间距 */
    section {
      padding: 120px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }
    
    /* 标题层级 */
    h1 {
      font-weight: 700;
      font-size: 56px;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
    }
    
    h2 {
      font-weight: 600;
      font-size: 40px;
      letter-spacing: -0.01em;
      color: var(--primary-deep);
    }
    
    h3 {
      font-weight: 500;
      font-size: 20px;
      color: var(--primary-deep);
    }
    
    .text-accent {
      color: var(--accent-cyan);
    }
    
    .bg-light-gray {
      background-color: var(--bg-light);
    }
    
    /* 按钮组件 */
    .btn-primary-custom {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--border-radius-sm);
      border: none;
      padding: 0.75rem 2rem;
      letter-spacing: 0.05em;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    
    .btn-primary-custom:hover {
      background: #00D4E0;
      color: var(--primary-deep);
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--border-radius-sm);
      padding: 0.75rem 2rem;
      letter-spacing: 0.05em;
      transition: var(--transition-smooth);
      display: inline-block;
    }
    
    .btn-outline-custom:hover {
      background: var(--primary-deep);
      color: #FFFFFF;
    }
    
    /* 卡片 */
    .card-custom {
      background: var(--surface-white);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-md);
      transition: var(--transition-smooth);
      padding: 2rem;
      height: 100%;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    
    /* 表单 */
    .form-control-custom {
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-sm);
      padding: 0.6rem 1rem;
      transition: var(--transition-smooth);
    }
    
    .form-control-custom:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.15);
      outline: none;
    }
    
    /* 首屏 */
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 500px;
      border-radius: var(--border-radius-md);
      box-shadow: 0 10px 30px rgba(0,0,0,0.1);
      position: relative;
      overflow: hidden;
    }
    
    .hero-visual::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(0,240,255,0.2) 0%, rgba(13,17,23,0.4) 100%);
    }
    
    /* 数字序号 */
    .feature-number {
      font-size: 64px;
      font-weight: 200;
      color: var(--accent-cyan);
      line-height: 1;
      margin-bottom: 0.5rem;
    }
    
    .divider-vertical {
      width: 1px;
      height: 80px;
      background: var(--border-light);
      margin: 0 1rem;
    }
    
    /* 解决方案图片容器 */
    .solution-img {
      background-size: cover;
      background-position: center;
      min-height: 320px;
      border-radius: var(--border-radius-md);
      position: relative;
      overflow: hidden;
    }
    
    .solution-img::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(0deg, rgba(0,240,255,0.15) 0%, rgba(255,255,255,0.1) 100%);
      z-index: 1;
    }
    
    /* FAQ手风琴 */
    .accordion-custom .accordion-button {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--border-light);
      border-radius: 0;
      box-shadow: none;
      color: var(--primary-deep);
      font-weight: 500;
      padding: 1.25rem 0;
      font-size: 1.1rem;
    }
    
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--accent-cyan);
      background: transparent;
      box-shadow: none;
    }
    
    .accordion-custom .accordion-button::after {
      background-image: none;
      content: '+';
      font-size: 1.5rem;
      font-weight: 300;
      color: var(--secondary-gray);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .accordion-custom .accordion-button:not(.collapsed)::after {
      content: '−';
      color: var(--accent-cyan);
    }
    
    .accordion-custom .accordion-body {
      padding: 1rem 0 1.5rem;
      color: var(--secondary-gray);
      border-bottom: 1px solid var(--border-light);
    }
    
    /* 数据指标 */
    .metric-number {
      font-weight: 700;
      font-size: 48px;
      color: var(--accent-cyan);
      line-height: 1.2;
    }
    
    /* CTA 深色横幅 */
    .cta-dark {
      background: var(--primary-deep);
      color: white;
    }
    
    /* 页脚 */
    .footer-link {
      color: var(--secondary-gray);
      transition: var(--transition-smooth);
    }
    
    .footer-link:hover {
      color: var(--accent-cyan);
    }
    
    .social-icon {
      font-size: 1.5rem;
      color: var(--secondary-gray);
      margin-right: 1rem;
      transition: var(--transition-smooth);
    }
    
    .social-icon:hover {
      color: var(--accent-cyan);
    }
    
    /* 响应式调整 */
    @media (max-width: 992px) {
      h1 {
        font-size: 42px;
      }
      h2 {
        font-size: 32px;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 8px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      }
    }
    
    @media (max-width: 768px) {
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
      .feature-number {
        font-size: 48px;
      }
      .hero-visual {
        min-height: 280px;
        margin-top: 2rem;
      }
    }