/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --secondary: #00F0FF;
      --bg-dark: #0A0E17;
      --bg-light: #F8F9FC;
      --text-strong: #FFFFFF;
      --text-body: #B0B8C5;
      --text-muted: #6B7280;
      --border-glow: rgba(0, 240, 255, 0.25);
      --card-bg: rgba(255, 255, 255, 0.03);
      --radius-lg: 20px;
      --radius-full: 50px;
      --shadow-card: 0 20px 40px rgba(123, 47, 247, 0.15);
      --font-mono: 'SF Mono', 'Consolas', 'Monaco', monospace;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航分屏联动 */
    .header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 14, 23, 0.9);
      backdrop-filter: blur(12px);
      z-index: 50;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(123, 47, 247, 0.2);
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 800;
      color: white;
      letter-spacing: 1px;
    }
    .logo-icon {
      color: var(--primary);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      margin-left: auto;
      margin-right: 24px;
    }
    .nav-links a {
      text-decoration: none;
      color: #B0B8C5;
      font-size: 0.9rem;
      font-weight: 500;
      transition: var(--transition);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--secondary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border: none;
      color: white;
      padding: 8px 22px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition);
      height: 36px;
      display: flex;
      align-items: center;
      white-space: nowrap;
    }
    .nav-cta:hover {
      transform: scale(1.05);
      box-shadow: 0 8px 20px rgba(0, 240, 255, 0.3);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      z-index: 49;
    }
    .mobile-menu a {
      color: #B0B8C5;
      font-size: 1.1rem;
      text-decoration: none;
      font-weight: 500;
    }

    /* Hero 分屏 */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 64px;
      background: var(--bg-dark);
    }
    .hero-left {
      flex: 0 0 55%;
      padding-right: 40px;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }
    .hero-right img {
      width: 100%;
      height: auto;
      border-radius: 32px;
      box-shadow: 0 30px 50px rgba(123, 47, 247, 0.4);
    }

    .gradient-text {
      background: linear-gradient(to right, var(--secondary), #a78bfa);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .badge-group {
      display: flex;
      gap: 20px;
      margin: 28px 0 32px;
      flex-wrap: wrap;
    }
    .badge-item {
      display: flex;
      flex-direction: column;
    }
    .badge-number {
      font-family: var(--font-mono);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--secondary);
    }
    .badge-label {
      font-size: 0.8rem;
      color: #94A3B8;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-full);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 12px 28px rgba(0, 240, 255, 0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 36px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: white;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: #94A3B8;
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    .card-glass {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }
    .card-glass:hover {
      transform: translateY(-8px);
      border-color: var(--secondary);
      box-shadow: 0 25px 45px rgba(0, 240, 255, 0.2);
    }

    .icon-box {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, rgba(123,47,247,0.3), rgba(0,240,255,0.2));
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 2rem;
      color: var(--secondary);
    }

    .mono-badge {
      font-family: var(--font-mono);
      color: var(--secondary);
      font-weight: 700;
    }

    /* 手风琴FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(123,47,247,0.25);
      border-radius: 16px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: rgba(10,14,23,0.7);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 20px;
      color: #B0B8C5;
      border-top: 1px solid rgba(123,47,247,0.2);
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px;
    }

    footer {
      background: #05070c;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-section {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: auto;
        padding: 20px 0;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
      .badge-group {
        justify-content: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }