/* roulang page: index */
:root {
      --deep: #0F0A1E;
      --nebula: #6C3FCE;
      --starlight: #00D4FF;
      --amber: #FFB347;
      --card-bg: rgba(255,255,255,0.05);
      --border-light: rgba(255,255,255,0.1);
      --text-dim: rgba(255,255,255,0.65);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep);
      color: #ffffff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 80px 0;
      }
    }

    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      backdrop-filter: blur(20px);
      background: rgba(15,10,30,0.6);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
    }
    .glass-nav.scrolled {
      background: rgba(15,10,30,0.95);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      color: #fff;
      text-shadow: 0 0 12px var(--nebula);
    }
    .logo i {
      color: var(--starlight);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.9rem;
      color: rgba(255,255,255,0.75);
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-links a:hover {
      color: #fff;
      text-shadow: 0 0 8px var(--starlight);
    }
    .btn-nav {
      background: var(--nebula);
      padding: 8px 22px;
      border-radius: 32px;
      color: white;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s;
      border: none;
      cursor: pointer;
    }
    .btn-nav:hover {
      background: #8B5CF6;
      box-shadow: 0 0 20px rgba(108,63,206,0.6);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(15,10,30,0.98);
        padding: 24px 0;
        gap: 18px;
        backdrop-filter: blur(30px);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: radial-gradient(circle at 30% 20%, rgba(108,63,206,0.4) 0%, transparent 50%), 
                        linear-gradient(180deg, #0F0A1E 0%, #1E0A3C 100%),
                        url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 820px;
      margin: 0 auto;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.2;
      text-shadow: 0 0 30px rgba(108,63,206,0.8);
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 1.3rem;
      color: rgba(220,210,255,0.9);
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--nebula) 0%, #8B5CF6 100%);
      padding: 14px 36px;
      border-radius: 12px;
      font-weight: 600;
      color: white;
      font-size: 1rem;
      transition: all 0.3s;
      border: none;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 12px 28px rgba(108,63,206,0.5);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--starlight);
      color: var(--starlight);
      padding: 14px 36px;
      border-radius: 12px;
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-secondary:hover {
      background: rgba(0,212,255,0.08);
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 2.5rem; }
      .hero p { font-size: 1.1rem; }
    }

    /* 卡片 */
    .card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 24px;
      padding: 32px;
      transition: all 0.3s;
      box-shadow: 0 8px 32px rgba(108,63,206,0.1);
    }
    .card:hover {
      border-color: rgba(108,63,206,0.4);
      box-shadow: 0 8px 36px rgba(108,63,206,0.3);
      transform: translateY(-4px);
    }
    .stat-badge {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--starlight), #A78BFA);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      padding: 24px;
      margin-bottom: 16px;
      border: 1px solid rgba(255,255,255,0.06);
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item:hover {
      background: rgba(255,255,255,0.06);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }