/* roulang page: index */
:root {
      --primary: #B620E0;
      --primary-hover: #D441F5;
      --accent: #FFB71B;
      --bg-deep: #0B0C10;
      --bg-card: #1F2833;
      --bg-input: #2B2B2B;
      --text-main: #FFFFFF;
      --text-muted: #C5C6C7;
      --border-dim: rgba(182, 32, 224, 0.25);
      --font-number: 'Rajdhani', 'DIN', system-ui, sans-serif;
      --radius-lg: 24px;
      --radius-md: 14px;
      --shadow-glow: 0 12px 32px rgba(182, 32, 224, 0.35);
      --transition-smooth: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-muted);
      font-family: 'Noto Sans SC', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button, input, select {
      font-family: inherit;
      outline: none;
      border: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 沉浸式顶部导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: rgba(11, 12, 16, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 183, 27, 0.15);
      transition: background 0.25s ease;
    }
    .navbar.scrolled {
      background: rgba(8, 8, 11, 0.94);
      border-bottom-color: var(--primary);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.55rem;
      color: var(--text-main);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent);
      filter: drop-shadow(0 0 10px rgba(255,183,27,0.6));
    }
    .nav-links {
      display: flex;
      gap: 34px;
      font-weight: 500;
    }
    .nav-links a {
      position: relative;
      color: var(--text-muted);
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2.5px;
      background: var(--accent);
      border-radius: 4px;
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: #15171e;
      padding: 18px 24px;
      gap: 16px;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* 首屏 Hero */
    .hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: radial-gradient(circle at 30% 40%, rgba(182,32,224,0.4) 0%, #0B0C10 80%);
      overflow: hidden;
      padding-top: 76px;
    }
    #heroCanvas {
      position: absolute;
      inset: 0;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 24px;
    }
    h1 {
      font-size: 3.8rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      color: var(--accent);
      text-shadow: 0 4px 20px rgba(255,183,27,0.5);
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 650px;
      margin: 18px auto 30px;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      justify-content: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: 60px;
      padding: 16px 40px;
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 8px 22px rgba(182,32,224,0.5);
      transition: transform 0.2s ease, background 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      border-radius: 60px;
      padding: 16px 34px;
      font-weight: 700;
    }
    .btn-outline:hover {
      background: rgba(255,183,27,0.1);
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 2.6rem;
      }
    }
    /* 版块通用 */
    section {
      padding: 90px 24px;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      width: 4px;
      height: 36px;
      background: var(--accent);
      border-radius: 4px;
    }
    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 45px;
    }
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 30px 20px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      color: var(--accent);
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 服务矩阵﹣不对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 35px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 26px 18px;
      transition: var(--transition-smooth);
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 14px;
    }
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比区域 */
    .compare-wrapper {
      display: flex;
      gap: 30px;
      margin-top: 40px;
    }
    .compare-col {
      flex: 1;
      padding: 28px;
      border-radius: var(--radius-md);
      background: var(--bg-card);
      border: 1px solid rgba(255,255,255,0.05);
    }
    .compare-col.traditional {
      opacity: 0.75;
    }
    .compare-col.duobao {
      border-color: var(--primary);
      background: rgba(31,40,51,0.9);
      box-shadow: 0 0 28px rgba(182,32,224,0.3);
    }
    @media (max-width: 768px) {
      .compare-wrapper {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      padding: 18px 22px;
      cursor: pointer;
      transition: border 0.2s;
    }
    .faq-item.open {
      border-color: var(--primary);
    }
    .faq-question {
      font-weight: 600;
      color: var(--accent);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      margin-top: 14px;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA表单 */
    .cta-section {
      background: linear-gradient(135deg, #1c1324, #0d0d14);
      border-radius: var(--radius-lg);
      margin: 70px 24px;
      padding: 54px 34px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
    }
    .cta-heading {
      color: var(--accent);
      font-size: 2rem;
      font-weight: 700;
    }
    .cta-form {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      align-items: center;
    }
    .cta-form select, .cta-form input {
      background: var(--bg-input);
      color: white;
      border: 1px solid var(--border-dim);
      padding: 14px 16px;
      border-radius: 36px;
      min-width: 160px;
    }
    footer {
      background: #0a0a0f;
      padding: 56px 24px 30px;
      text-align: center;
    }
    .footer-logo {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 20px;
    }