/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --electric-purple: #7C3AED;
      --neon-cyan: #00F0FF;
      --warm-gold: #F59E0B;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.45);
      --card-radius-lg: 16px;
      --card-radius-sm: 12px;
      --shadow-default: 0 4px 24px rgba(124, 58, 237, 0.08);
      --shadow-hover: 0 8px 40px rgba(124, 58, 237, 0.25);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      background: linear-gradient(135deg, var(--deep-space) 0%, #1A1040 100%);
      color: var(--text-secondary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(124, 58, 237, 0.2);
    }
    .nav-link {
      position: relative;
      color: var(--text-secondary);
      transition: color 0.2s;
      font-weight: 500;
      padding: 0.5rem 0.25rem;
      text-decoration: none;
    }
    .nav-link:hover {
      color: var(--neon-cyan);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--electric-purple);
      color: white;
      font-weight: 600;
      border-radius: 2rem;
      padding: 0.75rem 2rem;
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.4);
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary:hover {
      background: #6D28D9;
      box-shadow: 0 0 25px var(--neon-cyan), 0 6px 20px rgba(124, 58, 237, 0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--electric-purple);
      color: white;
      font-weight: 600;
      border-radius: 2rem;
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      cursor: pointer;
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
    }

    /* 卡片玻璃态 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-lg);
      transition: all 0.35s ease;
      box-shadow: var(--shadow-default);
    }
    .glass-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(124, 58, 237, 0.4);
      transform: translateY(-4px);
    }
    .glass-card-sm {
      border-radius: var(--card-radius-sm);
      padding: 20px;
    }

    /* 数据亮色 */
    .data-highlight {
      color: var(--neon-cyan);
      font-weight: 700;
    }
    .gold-highlight {
      color: var(--warm-gold);
      font-weight: 700;
    }

    /* Hero右栏光圈 */
    .hero-glow-ring {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-glow-ring::before {
      content: '';
      position: absolute;
      width: 90%;
      height: 90%;
      border-radius: 50%;
      border: 2px solid rgba(124, 58, 237, 0.3);
      animation: spinSlow 12s linear infinite;
      pointer-events: none;
    }
    @keyframes spinSlow {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }

    /* 粒子光效（CTA区域） */
    .particle-bg {
      position: relative;
      overflow: hidden;
    }
    .particle-bg::after {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: radial-gradient(circle at 30% 40%, rgba(124,58,237,0.15) 0%, transparent 50%),
                  radial-gradient(circle at 70% 60%, rgba(0,240,255,0.1) 0%, transparent 50%);
      animation: floatParticle 18s infinite alternate;
    }
    @keyframes floatParticle {
      0% { transform: translate(0, 0) scale(1); }
      100% { transform: translate(-2%, 2%) scale(1.1); }
    }

    /* 瀑布流 */
    .masonry {
      column-count: 3;
      column-gap: 1.5rem;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.5rem;
      display: inline-block;
      width: 100%;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-left: 3px solid var(--electric-purple);
      transition: all 0.3s;
      background: rgba(255,255,255,0.02);
      border-radius: 0 12px 12px 0;
    }
    .faq-item.active {
      box-shadow: 0 0 20px rgba(124, 58, 237, 0.25);
      border-left-color: var(--neon-cyan);
    }

    /* 底部导航胶囊（移动端） */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(10, 14, 39, 0.9);
        backdrop-filter: blur(24px);
        border-radius: 40px;
        padding: 0.5rem 1.2rem;
        border: 1px solid rgba(255,255,255,0.1);
        z-index: 60;
      }
      .mobile-nav-item {
        color: rgba(255,255,255,0.6);
        padding: 0.4rem 0.8rem;
        border-radius: 30px;
        font-size: 0.8rem;
        transition: 0.2s;
      }
      .mobile-nav-item.active {
        background: var(--electric-purple);
        color: white;
      }
      .masonry { column-count: 1; }
    }
    @media (min-width: 769px) and (max-width: 1023px) {
      .masonry { column-count: 2; }
    }