/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #FF4D2E;
      --primary-hover: #E6391C;
      --primary-light: rgba(255, 77, 46, 0.08);
      --secondary: #1A1D23;
      --accent: #00C2D1;
      --accent-light: rgba(0, 194, 209, 0.1);
      --bg: #F8F9FA;
      --white: #FFFFFF;
      --gray-100: #F1F3F5;
      --gray-200: #E9ECEF;
      --gray-600: #4A4E57;
      --gray-700: #343840;
      --border: rgba(0,0,0,0.04);
      --shadow-sm: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 40px rgba(0,0,0,0.08);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-sm: 12px;
      --radius-tag: 40px;
      --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-data: "DIN Alternate", "Roboto", sans-serif;
      --transition: all 0.25s ease;
      --header-height: 80px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }

    body {
      font-family: var(--font-main);
      background-color: var(--bg);
      color: var(--gray-600);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 基础标签重置 */
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-main);
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }

    h1, h2, h3 {
      color: var(--secondary);
      line-height: 1.25;
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 1rem;
    }

    /* ----- 导航栏（沉浸式毛玻璃） ----- */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.03);
      z-index: 1000;
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }

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

    .nav-link {
      color: var(--gray-600);
      font-weight: 500;
      font-size: 0.98rem;
      position: relative;
      padding: 8px 0;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF4D2E, #FF7A45);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 6px 18px rgba(255, 77, 46, 0.25);
      white-space: nowrap;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 24px rgba(255, 77, 46, 0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--secondary);
      background: none;
    }

    /* 移动端导航抽屉 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 80%;
        max-width: 320px;
        background: var(--white);
        flex-direction: column;
        padding: 100px 32px 40px;
        gap: 32px;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        z-index: 999;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        align-items: center;
        z-index: 1001;
      }
      .nav-cta {
        display: none;
      }
      .nav-menu .nav-cta-mobile {
        display: block;
        margin-top: 20px;
      }
      .desktop-only { display: none; }
    }
    .nav-cta-mobile { display: none; }
    .mobile-visible { display: none; }
    @media (max-width: 768px) {
      .mobile-visible { display: block; }
    }

/* 完整自定义区块样式 */
    .hero { background:var(--secondary); color:white; padding:120px 0 80px; position:relative; overflow:hidden; }
    .hero-grid { display:flex; align-items:center; gap:60px; flex-wrap:wrap; }
    .hero-text h1 { color:white; font-size:3.5rem; }
    .hero-sub { color:rgba(255,255,255,0.8); margin:24px 0; }
    .hero-actions{ display:flex; gap:16px; flex-wrap:wrap; }
    .hero-data-badges{ display:flex; gap:20px; background:rgba(255,255,255,0.1); padding:24px; border-radius:24px; }
    .data-badge{ font-family:var(--font-data); font-weight:800; font-size:2rem; color:var(--accent); }
    .hero-bg-decor{ position:absolute; right:0; top:0; width:40%; height:100%; background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat; opacity:0.25; }
    .grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
    .stat-card{ background:white; padding:28px; border-radius:20px; box-shadow:var(--shadow-sm); }
    .trend.up{color:var(--accent);} .trend.down{color:var(--primary);}
    .grid-2x3{ display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
    .service-card{background:white; border-radius:20px; padding:32px; }
    .comp-grid{display:grid; grid-template-columns:1fr 1fr; gap:30px;}
    .traditional{background:#f0f0f0; padding:30px; border-radius:20px;}
    .kuaishou-solution{background:rgba(255,77,46,0.05); border:1px solid var(--primary);}
    .accordion-btn{width:100%; text-align:left; padding:16px; background:white; border:none; font-weight:600;}
    .panel{display:none;} .accordion-item.active .panel{display:block;}
    .contact-form input{width:100%; padding:14px; margin-bottom:16px; border-radius:12px; border:1px solid #ddd;}
    .footer{background:var(--secondary); color:white; padding:40px 0;}
    @media(max-width:768px){.grid-4,.grid-2x3,.comp-grid{grid-template-columns:1fr;}}