/* roulang page: index */
:root {
      --deep-bg: #0A0E27;
      --card-bg: #FFFFFF;
      --light-bg: #F5F6FA;
      --border-light: #E0E2E8;
      --text-dark: #1A1D2E;
      --text-gray: #6B7280;
      --white: #FFFFFF;
      --gradient-purple-cyan: linear-gradient(135deg, #6C3CFC, #00E5FF);
      --energy-pink: #FF3CAC;
      --purple: #6C3CFC;
      --cyan: #00E5FF;
      
      --radius-card-lg: 16px;
      --radius-card-sm: 12px;
      --radius-pill: 50px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 32px rgba(108,60,252,0.15);
      --transition-smooth: 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 按钮系统 */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--gradient-purple-cyan);
      color: white;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      transition: transform 0.25s, box-shadow 0.25s, filter 0.25s;
      box-shadow: 0 4px 12px rgba(108,60,252,0.3);
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 8px 28px rgba(108,60,252,0.5);
      transform: translateY(-1px);
    }
    
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      font-size: 16px;
      padding: 13px 30px;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: 0.25s ease;
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      box-shadow: 0 0 16px rgba(0,229,255,0.2);
    }
    
    .data-badge {
      display: inline-flex;
      align-items: baseline;
      background: rgba(108,60,252,0.12);
      color: var(--purple);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      gap: 6px;
      white-space: nowrap;
    }
    .data-badge .number {
      font-family: "Inter", "DIN Alternate", "Roboto", sans-serif;
      font-size: 20px;
      font-weight: 700;
      color: var(--energy-pink);
    }
    
    /* 导航 */
    #nav {
      position: fixed;
      top: 0; left: 0; width: 100%;
      background: white;
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 50;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      backdrop-filter: blur(8px);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .brand {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, #6C3CFC, #00E5FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .brand i {
      font-size: 26px;
      background: none;
      -webkit-text-fill-color: #6C3CFC;
      transition: transform 0.3s;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-dark);
      text-decoration: none;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: 0.2s;
    }
    .nav-links a:hover {
      color: var(--purple);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--gradient-purple-cyan);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 28px;
      cursor: pointer;
      color: var(--text-dark);
    }
    
    /* Hero */
    #hero {
      background: var(--deep-bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 120px 0 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .hero-title {
      font-size: 38px;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #CCE9FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.3;
    }
    .hero-sub {
      color: rgba(255,255,255,0.8);
      margin: 20px 0 32px;
      font-size: 18px;
    }
    .metrics-board {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .metric-card {
      background: rgba(255,255,255,0.07);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card-lg);
      padding: 20px;
      color: white;
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .metric-num {
      font-family: "Inter", "DIN Alternate", sans-serif;
      font-size: 32px;
      font-weight: 700;
      color: var(--energy-pink);
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .pulse-dot {
      width: 10px; height: 10px;
      background: #00E5FF;
      border-radius: 50%;
      animation: pulse 1.6s infinite;
    }
    @keyframes pulse { 0%{opacity:1;} 50%{opacity:0.3;} }
    
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    
    /* 核心优势 */
    #advantages { background: var(--light-bg); }
    .adv-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; margin-top: 48px; }
    .adv-card {
      background: white; border-radius: var(--radius-card-lg); padding: 36px 28px;
      box-shadow: var(--shadow-sm); transition: 0.3s; text-align: center;
    }
    .adv-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
    .adv-icon { font-size: 42px; background: linear-gradient(135deg, #6C3CFC, #00E5FF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
    
    /* 服务矩阵 */
    .service-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 32px; margin-top: 48px; }
    .service-card {
      background: white; border-radius: var(--radius-card-lg); padding: 36px;
      border:1px solid var(--border-light); transition: 0.3s;
    }
    .service-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-5px); }
    
    /* 对比区 */
    #comparison { background: var(--deep-bg); color: white; }
    .compare-wrapper { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 30px; margin-top: 40px; }
    .pain-card { background: rgba(255,60,60,0.12); border-radius: var(--radius-card-lg); padding: 28px; }
    .solve-card { background: rgba(0,229,120,0.12); border-radius: var(--radius-card-lg); padding: 28px; }
    
    /* 案例 */
    .cases-row { display: flex; gap: 28px; overflow-x: auto; padding-bottom: 16px; margin-top: 40px; }
    .case-card { min-width: 300px; background: white; border-radius: var(--radius-card-lg); overflow: hidden; box-shadow: var(--shadow-sm); transition: 0.3s; }
    .case-card img { width:100%; height:180px; object-fit:cover; }
    
     /* FAQ */
    .faq-item { border-bottom: 1px solid var(--border-light); padding: 20px 0; cursor: pointer; }
    .faq-question { font-weight: 600; display: flex; justify-content: space-between; }
    
    /* 最终CTA */
    #cta { background: linear-gradient(135deg, #0A0E27 0%, #1A1040 50%, #0A0E27 100%); }
    .cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap:48px; align-items: center; }
    .form-card { background: white; border-radius: var(--radius-card-lg); padding: 40px; }
    input, textarea { width:100%; padding:14px; margin-bottom:16px; border:1px solid var(--border-light); border-radius:12px; font-size:16px; }
    input:focus, textarea:focus { border-color: var(--energy-pink); outline:none; }
    
    /* 页脚 */
    #footer { background: var(--deep-bg); color: var(--text-gray); padding: 60px 0 30px; }
    
    @media (max-width: 1023px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid, .cta-grid, .adv-grid, .service-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
    }
  .mobile-menu {
      display: none;
    }
    .hero-title {
      font-size: clamp(28px, 5vw, 38px);
    }
    .metrics-board {
      flex-direction: row;
      overflow-x: auto;
      gap: 16px;
      -webkit-overflow-scrolling: touch;
      padding-bottom: 4px;
    }
    .metric-card {
      min-width: 200px;
      flex-shrink: 0;
    }
    .cases-row {
      gap: 20px;
    }
    .case-card {
      min-width: 260px;
    }
    .btn-primary, .btn-outline {
      width: 100%;
      justify-content: center;
    }
    section {
      padding: 50px 0;
    }