/* roulang page: index */
/* 自定义 CSS 变量与全局重置 */
    :root {
      --primary: #6C3CFF;
      --primary-glow: rgba(108, 60, 255, 0.7);
      --secondary: #FF6B35;
      --secondary-glow: rgba(255, 107, 53, 0.6);
      --deep-bg: #080B1A;
      --card-bg: rgba(20, 22, 45, 0.7);
      --glass-border: rgba(108, 60, 255, 0.2);
      --text-body: #B0B5CC;
      --text-light: #F0F0F5;
      --text-white: #FFFFFF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(108, 60, 255, 0.15);
      --shadow-hover: 0 16px 48px rgba(108, 60, 255, 0.3);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', 'Roboto', sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    
    /* 星空噪点背景效果 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.75" numOctaves="4" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(/%23noise)" opacity="0.03"/></svg>');
      pointer-events: none;
      z-index: 0;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
      position: relative;
      z-index: 2;
    }
    
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(108, 60, 255, 0.6);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    /* 主按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #6C3CFF 0%, #8B5CFF 100%);
      color: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-weight: 600;
      box-shadow: 0 4px 20px rgba(108, 60, 255, 0.4);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 6px 32px var(--primary-glow);
      transform: translateY(-2px);
      color: #FFFFFF;
    }
    
    /* 次按钮 */
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: #FFFFFF;
      box-shadow: 0 4px 20px var(--secondary-glow);
      transform: translateY(-2px);
    }
    
    /* 文字链接下划线动画 */
    .link-underline {
      color: var(--primary);
      position: relative;
      text-decoration: none;
      font-weight: 500;
      display: inline-block;
      padding-bottom: 2px;
    }
    .link-underline::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      transform: scaleX(0);
      transform-origin: right;
      transition: transform 0.3s ease;
    }
    .link-underline:hover::after {
      transform: scaleX(1);
      transform-origin: left;
    }
    
    /* 区块标题装饰线 */
    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 2.5rem;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 40px;
      background: var(--primary);
      box-shadow: 0 0 15px var(--primary-glow);
      border-radius: 2px;
      flex-shrink: 0;
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 999;
      background: rgba(8, 11, 26, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(108, 60, 255, 0.2);
    }
    .nav-link {
      color: var(--text-body);
      transition: var(--transition-smooth);
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-link:hover,
    .nav-link.active {
      color: #FFFFFF;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary-glow);
      transform: scaleX(0);
      transition: transform 0.3s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      transform: scaleX(1);
    }
    
    /* Hero 粒子动画 */
    .particle {
      position: absolute;
      background: var(--primary);
      border-radius: 50%;
      filter: blur(1px);
      opacity: 0.6;
      animation: float 6s infinite alternate;
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.4; }
      100% { transform: translateY(-30px) scale(1.2); opacity: 0.8; }
    }
    
    /* 横向滚动轨道 */
    .scroll-track {
      display: flex;
      overflow-x: auto;
      gap: 1.5rem;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) var(--deep-bg);
    }
    .scroll-track::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-track::-webkit-scrollbar-track {
      background: var(--deep-bg);
    }
    .scroll-track::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 12px;
    }
    .scroll-card {
      min-width: 300px;
      scroll-snap-align: start;
      flex-shrink: 0;
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      background: rgba(255,255,255,0.03);
      padding: 1.5rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.3s ease;
    }
    .faq-item.active .faq-question {
      background: rgba(108, 60, 255, 0.08);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 1.5rem;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    
    /* 响应式调整 */
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
      .scroll-card {
        min-width: 260px;
      }
    }
    @media (max-width: 480px) {
      .btn-primary, .btn-outline {
        padding: 12px 24px;
        font-size: 0.9rem;
      }
    }