/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --deep-ink: #0B0F1A;
      --electric-cyan: #00E5FF;
      --sport-orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.06);
      --glass-hover-border: rgba(255, 255, 255, 0.15);
      --text-primary: #F0F2F5;
      --text-secondary: #B0B8C5;
      --text-muted: #6B7280;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 18px rgba(0, 229, 255, 0.5);
      --radius-lg: 16px;
      --radius-pill: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "DIN", "Roboto", sans-serif;
      --transition: 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-ink);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态基础卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .glass-card:hover {
      border-color: var(--glass-hover-border);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
      transform: translateY(-4px);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-ink);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 16px;
      letter-spacing: 0.5px;
      border: 1.5px solid transparent;
    }

    .btn-primary:hover {
      background: #00d4e8;
      box-shadow: var(--shadow-glow);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 16px;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.08);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
    }

    /* 区块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-primary);
      letter-spacing: -0.3px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 15, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--electric-cyan);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      font-size: 28px;
      color: var(--sport-orange);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-cyan);
    }

    .nav-cta {
      background: var(--electric-cyan);
      color: #0B0F1A !important;
      padding: 10px 22px !important;
      border-radius: 30px;
      font-weight: 600;
    }

    .mobile-toggle {
      display: none;
      font-size: 24px;
      color: white;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 0;
    }

    .hero::before {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: linear-gradient(90deg, rgba(11,15,26,0.9) 40%, rgba(11,15,26,0.4) 100%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero .highlight {
      color: var(--electric-cyan);
    }

    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .floating-card {
      position: absolute;
      right: 10%;
      bottom: 20%;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      padding: 20px 28px;
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,0.1);
      z-index: 2;
      color: var(--electric-cyan);
      display: none;
    }

    /* 通用 section 间距 */
    section {
      padding: 100px 0;
      position: relative;
    }

    /* 优势卡片网格 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .adv-card {
      text-align: center;
      padding: 32px 20px;
    }

    .adv-icon {
      font-size: 36px;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }

    /* 服务矩阵 3x2 */
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      display: flex;
      gap: 20px;
      padding: 28px;
      align-items: flex-start;
    }

    /* 数据统计 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--electric-cyan);
      font-family: var(--font-mono);
    }

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

    .case-img {
      height: 180px;
      background-size: cover;
      border-radius: 12px;
    }

    .tag {
      background: var(--sport-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .step {
      text-align: center;
      flex:1;
    }

    .step-circle {
      width: 60px;
      height: 60px;
      border: 2px dashed var(--electric-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      margin: 0 auto 16px;
      color: var(--electric-cyan);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* CTA 尾屏 */
    .cta-section {
      background: linear-gradient(180deg, #0B0F1A 0%, #000 100%);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    /* 响应式设计 */
    @media (max-width: 1024px) {
      .grid-4, .grid-3x2, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left:0;right:0;
        background: rgba(11,15,26,0.95);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 0;
        z-index: 999;
        border-top: 1px solid rgba(255,255,255,0.05);
      }
      .mobile-bottom-nav a {
        color: var(--text-secondary);
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .hero h1 { font-size: 32px; }
      .grid-4, .grid-3x2, .case-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        gap: 24px;
      }
    }