/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: rgba(255,255,255,0.05);
      --border-light: rgba(255,255,255,0.1);
      --glow-blue: #00C2FF;
      --neon-purple: #A855F7;
      --energy-orange: #FF6B35;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7B8D;
      --glass-blur: 16px;
      --radius-card: 20px;
      --radius-btn: 50px;
      --shadow-card: 0 10px 30px rgba(0,0,0,0.5);
      --shadow-glow: 0 0 25px rgba(0,194,255,0.45);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: var(--bg-deep);
      background-image: radial-gradient(circle at 30% 20%, #1A1F3A 0%, #0A0E27 80%);
      color: var(--text-secondary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4, h5 {
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-top: 0;
    }
    
    h1 { font-size: 2.8rem; line-height: 1.2; }
    h2 { font-size: 2.2rem; margin-bottom: 1rem; position: relative; display: inline-block; }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--glow-blue);
      box-shadow: 0 0 10px var(--glow-blue);
      border-radius: 4px;
    }
    h3 { font-size: 1.5rem; font-weight: 600; }
    h4 { font-size: 1.25rem; font-weight: 600; }
    
    a {
      color: var(--glow-blue);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: #66d9ff;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 0.75rem 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--glow-blue);
      filter: drop-shadow(0 0 8px #00C2FF);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      transition: 0.2s;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--glow-blue);
      box-shadow: 0 0 8px var(--glow-blue);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .badge-promo {
      background: var(--neon-purple);
      color: white;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
      margin-left: 8px;
      animation: pulse-badge 2s infinite;
    }
    @keyframes pulse-badge {
      0% { box-shadow: 0 0 0 0 rgba(168,85,247,0.6); }
      70% { box-shadow: 0 0 0 8px rgba(168,85,247,0); }
      100% { box-shadow: 0 0 0 0 rgba(168,85,247,0); }
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C2FF, #0095e0);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 35px rgba(0,194,255,0.7);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--glow-blue);
      color: var(--glow-blue);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(0,194,255,0.1);
      color: white;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* hero */
    .hero-section {
      padding: 160px 0 100px;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10,14,39,0.7);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .trust-badges {
      display: flex;
      gap: 2rem;
      margin-top: 3rem;
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
    }
    .trust-badges span {
      font-weight: 600;
      color: #aaa;
      transition: 0.2s;
    }
    .trust-badges span:hover {
      color: white;
      filter: grayscale(0);
    }
    
    /* 卡片共用 */
    .glass-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s, border-color 0.2s;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(0,194,255,0.25);
      border-color: rgba(0,194,255,0.4);
    }
    
    .section-padding {
      padding: 100px 0;
    }
    
    .feature-highlight {
      display: flex;
      gap: 2rem;
      align-items: center;
      margin-bottom: 4rem;
    }
    
    .progress-ring {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--glow-blue);
      font-weight: 600;
    }
    
    /* 滚动案例 */
    .scroll-cards {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }
    .scroll-card {
      min-width: 280px;
      scroll-snap-align: start;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 1.2rem 0;
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
    }
    
    footer {
      background: #060b1f;
      padding: 60px 0 30px;
    }
    
    @media (max-width: 1024px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: #0A0E27;
        position: absolute;
        top: 65px;
        left: 0;
        width: 100%;
        padding: 20px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .mobile-menu a {
        padding: 12px 0;
        border-bottom: 1px solid rgba(255,255,255,0.05);
        color: white;
      }
      .hero-section { padding: 140px 0 70px; }
      .section-padding { padding: 70px 0; }
      .feature-highlight {
        flex-direction: column;
      }
    }