/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #6C3CFC;
      --primary-glow: rgba(108, 60, 252, 0.5);
      --accent: #FF4D00;
      --accent-light: #FF6B33;
      --bg-deep: #0A0A0F;
      --bg-card: #14141F;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: rgba(255,255,255,0.45);
      --border-subtle: rgba(108, 60, 252, 0.25);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-full: 50px;
      --shadow-card: 0 0 30px rgba(108, 60, 252, 0.15);
      --shadow-button: 0 0 20px rgba(255, 77, 0, 0.5);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-data: 'DIN Alternate', 'PingFang SC', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --spacing-section: 120px;
      --max-width: 1320px;
      --nav-height: 80px;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-body);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 5vw;
      width: 100%;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      transition: background 0.4s ease, backdrop-filter 0.4s;
    }
    .navbar.scrolled {
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 5vw;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #fff 0%, #c0a0ff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo-icon {
      font-size: 2rem;
      background: none;
      -webkit-text-fill-color: var(--primary);
      background: none;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-full);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(255, 77, 0, 0.4);
      transition: all 0.3s;
    }
    .nav-cta:hover {
      background: var(--accent-light);
      box-shadow: 0 0 22px var(--accent);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(20,20,31,0.9);
        backdrop-filter: blur(20px);
        padding: 0.7rem 2rem;
        border-radius: 60px;
        gap: 2rem;
        box-shadow: 0 10px 30px rgba(0,0,0,0.6);
        border: 1px solid rgba(108,60,252,0.4);
        z-index: 999;
      }
      .nav-links a:not(.nav-cta) {
        font-size: 0.8rem;
      }
      .nav-cta {
        padding: 0.5rem 1.5rem;
        font-size: 0.85rem;
        background: var(--accent);
      }
      .hamburger {
        display: none;
      }
      .navbar {
        background: rgba(10,10,15,0.7);
        backdrop-filter: blur(8px);
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(108,60,252,0.25) 0%, transparent 55%),
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding-top: var(--nav-height);
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: clamp(3rem, 8vw, 4.5rem);
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #d9c9ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2.2rem;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 8px 20px rgba(255,77,0,0.45);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--accent-light);
      box-shadow: 0 0 30px var(--accent);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: white;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-full);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-secondary:hover {
      background: var(--primary);
      border-color: var(--primary);
      box-shadow: 0 0 18px var(--primary-glow);
    }
    .dashboard-preview {
      background: rgba(20,20,31,0.7);
      backdrop-filter: blur(14px);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border-subtle);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    .metric-small {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .metric-number {
      font-family: var(--font-data);
      font-size: 2.2rem;
      color: var(--accent);
      font-weight: 700;
    }
    /* 通用板块 */
    section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.8rem;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 3.5rem;
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      border: 1px solid rgba(108,60,252,0.2);
      transition: 0.3s;
      backdrop-filter: blur(4px);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 0 25px rgba(108,60,252,0.4);
      border-color: var(--primary);
    }
    .stat-value {
      font-family: var(--font-data);
      font-size: 2.8rem;
      font-weight: 700;
      color: white;
    }
    /* 服务矩阵 1+2 */
    .service-matrix {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .main-card {
      background: linear-gradient(0deg, rgba(20,20,31,0.9) 0%, rgba(10,10,15,0.7) 100%), url('/assets/images/coverpic/cover-1.webp') center/cover;
      border-radius: var(--radius-lg);
      padding: 3rem;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      min-height: 360px;
      border: 1px solid var(--primary);
    }
    .side-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .side-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 2rem;
      border: 1px solid rgba(108,60,252,0.25);
    }
    /* 对比 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .compare-left, .compare-right {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
    }
    .compare-right {
      border: 1px solid var(--primary);
      box-shadow: 0 0 30px rgba(108,60,252,0.25);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      border: 1px solid transparent;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 50% 0%, rgba(108,60,252,0.3), transparent 70%);
      border-radius: 40px;
      padding: 4rem 2rem;
      text-align: center;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .service-matrix { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .hero-content { flex-direction: column; }
      .faq-grid { grid-template-columns: 1fr; }
      .compare-container { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .nav-links { gap: 1.2rem; }
    }