/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #7B2FBE;
      --primary-glow: rgba(123, 47, 190, 0.4);
      --secondary: #1A1A2E;
      --highlight: #00F0FF;
      --highlight-glow: rgba(0, 240, 255, 0.5);
      --danger: #FF2D78;
      --bg-dark: #0F0F1A;
      --card-bg: rgba(30, 30, 50, 0.7);
      --card-border: rgba(123, 47, 190, 0.3);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0CC;
      --text-muted: #7A7A99;
      --border-light: rgba(255, 255, 255, 0.08);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 10px;
      --radius-full: 50px;
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.3);
      --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.6);
      --font-sans: 'Inter', 'MiSans', 'PingFang SC', system-ui, -apple-system, sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 3.5rem;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2.6rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: attr(data-en);
      display: block;
      font-size: 0.9rem;
      font-weight: 400;
      color: var(--highlight);
      letter-spacing: 2px;
      text-transform: uppercase;
      margin-top: 6px;
      opacity: 0.8;
    }
    h3 {
      font-size: 1.5rem;
    }
    h4 {
      font-size: 1.2rem;
    }

    a {
      color: var(--highlight);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: #fff;
      text-shadow: 0 0 8px var(--highlight);
    }

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

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

    /* 导航系统 - 沉浸式顶部固定 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 15, 26, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(123, 47, 190, 0.25);
      z-index: 1000;
      padding: 16px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 2rem;
      font-weight: 800;
      background: linear-gradient(135deg, #C084FC, #7B2FBE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
      text-shadow: 0 0 15px var(--primary-glow);
      line-height: 1;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 5px 0;
      font-size: 1rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--highlight);
      transition: width 0.3s;
      box-shadow: 0 0 10px var(--highlight);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }
    
    /* 移动端底部胶囊导航 (默认隐藏) */
    .mobile-bottom-nav {
      display: none;
    }

    /* 按钮体系 */
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0099CC);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 700;
      box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(123, 47, 190, 0.25);
      border-color: var(--highlight);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
      transform: translateY(-2px);
    }

    /* Hero 双栏杂志式 */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(123,47,190,0.25) 0%, transparent 70%);
      z-index: 0;
    }
    .hero-left {
      flex: 1 1 50%;
      z-index: 2;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(to right, #fff, #e0d0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      height: 420px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(0,240,255,0.4);
      box-shadow: 0 0 40px rgba(0,240,255,0.25);
      position: relative;
      overflow: hidden;
    }

    /* 亮点网格 3x2 */
    .highlights {
      padding: 100px 0;
    }
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .highlight-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
      position: relative;
    }
    .highlight-card:nth-child(odd) {
      border-left: 4px solid var(--primary);
    }
    .highlight-card:hover {
      border-color: var(--highlight);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--highlight);
      margin-bottom: 20px;
    }
    .highlight-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--highlight);
    }

    /* 核心服务图文交替 */
    .services {
      padding: 100px 0;
    }
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 100px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      height: 360px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--primary);
      transition: var(--transition);
    }
    .service-img:hover {
      box-shadow: 0 0 35px rgba(123,47,190,0.5);
    }
    .service-text {
      flex: 1;
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
    }
    .waterfall {
      columns: 3 280px;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #1e1e32;
      border: 1px solid var(--card-border);
      transition: var(--transition);
      position: relative;
    }
    .case-card img {
      width: 100%;
      display: block;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 20px;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      color: white;
    }

    /* 方案对比双表 */
    .compare {
      padding: 100px 0;
    }
    .compare-tables {
      display: flex;
      gap: 32px;
    }
    .plan-table {
      flex: 1;
      background: rgba(20,20,35,0.9);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--primary);
    }
    .plan-table.pro {
      border-color: var(--highlight);
      box-shadow: 0 0 25px rgba(0,240,255,0.2);
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 20px;
      cursor: pointer;
      border-left: 4px solid var(--primary);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1A2E, #0F0F1A);
      padding: 80px 0;
      text-align: center;
      border-top: 1px solid var(--primary);
    }

    /* 页脚 */
    .footer {
      background: #0A0A14;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 2.8rem; }
      .hero { flex-direction: column; }
      .grid-3x2 { grid-template-columns: repeat(2, 1fr); }
      .compare-tables { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,10,20,0.95);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px;
        z-index: 999;
        border-top: 1px solid var(--primary);
      }
      .grid-3x2, .faq-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .waterfall { columns: 2; }
    }