/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-cyan: #00E5FF;
      --gold: #D4A843;
      --dark-bg: #0A1128;
      --card-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(0,229,255,0.15);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-muted: rgba(255,255,255,0.5);
      --deep-footer: #060C1E;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 16px 48px rgba(0,229,255,0.15);
      --transition: all 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--dark-bg);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    
    .glass-card:hover {
      border-color: rgba(0,229,255,0.4);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    /* 导航栏自定义 */
    .top-bar {
      background: rgba(10,17,40,0.85) !important;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,229,255,0.1);
      transition: background 0.3s;
    }
    
    .top-bar.scrolled {
      background: rgba(10,17,40,0.95) !important;
    }
    
    .top-bar .menu {
      background: transparent;
    }
    
    .top-bar .menu li a {
      color: var(--text-secondary);
      font-weight: 500;
      padding: 0 16px;
      transition: color 0.2s;
    }
    
    .top-bar .menu li a:hover {
      color: var(--primary-cyan);
    }
    
    .logo-text {
      font-size: 1.6rem;
      font-weight: 700;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .logo-text i {
      color: var(--primary-cyan);
      font-size: 1.8rem;
    }
    
    .nav-cta {
      background: var(--primary-cyan);
      color: #0A1128 !important;
      font-weight: 700;
      border-radius: var(--radius-sm);
      padding: 10px 24px !important;
      margin-left: 16px;
      transition: all 0.3s;
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    
    .nav-cta:hover {
      box-shadow: 0 0 20px rgba(0,229,255,0.7);
      background: #00d0e8;
    }
    
    /* 汉堡菜单 */
    .menu-icon {
      color: #fff;
    }
    
    /* Hero 粒子背景 */
    .hero-section {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, #1a2540, #0A1128);
    }
    
    .particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    
    .particle {
      position: absolute;
      background: var(--primary-cyan);
      border-radius: 50%;
      opacity: 0.15;
      animation: float 6s infinite alternate;
    }
    
    @keyframes float {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-30px); }
    }
    
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      text-shadow: 0 0 30px rgba(0,229,255,0.5);
    }
    
    .btn-primary {
      background: var(--primary-cyan);
      color: #0A1128;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      transition: all 0.3s;
      box-shadow: 0 0 16px rgba(0,229,255,0.5);
      border: none;
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,229,255,0.8);
      background: #00d0e8;
    }
    
    .btn-outline {
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.3s;
    }
    
    .btn-outline:hover {
      background: var(--primary-cyan);
      color: #0A1128;
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
    }
    
    /* 板块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #fff;
    }
    
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    
    /* 优势1+2布局 */
    .advantage-big {
      height: 100%;
      padding: 32px;
    }
    
    .icon-box {
      width: 48px;
      height: 48px;
      background: rgba(0,229,255,0.1);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-cyan);
      font-size: 24px;
      margin-bottom: 16px;
    }
    
    /* 功能图文交替 */
    .feature-image {
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      border-radius: var(--radius-md);
      min-height: 280px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    }
    
    /* 案例背景纹理 */
    .case-bg {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    
    .case-bg::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(10,17,40,0.85);
      backdrop-filter: blur(4px);
    }
    
    /* 价格卡片高亮 */
    .price-highlight {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0,229,255,0.25);
    }
    
    /* FAQ手风琴 */
    .accordion-item {
      border-bottom: 1px solid rgba(0,229,255,0.1);
    }
    
    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      padding: 20px 0;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-bottom: 0;
    }
    
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 20px;
    }
    
    /* 页脚 */
    .footer-link {
      color: var(--text-secondary);
      transition: color 0.2s;
      display: block;
      margin-bottom: 8px;
    }
    
    .footer-link:hover {
      color: var(--primary-cyan);
    }
    
    /* 响应式 */
    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
      .feature-image {
        min-height: 200px;
        margin-top: 20px;
      }
    }