/* roulang page: index */
/* 自定义CSS变量与全局样式 */
    :root {
      --primary-deep: #0A0E27;
      --cyan: #00F0FF;
      --pink: #FF3CAC;
      --bg-light: #F5F5F7;
      --white: #FFFFFF;
      --text-dark: #1E1E2E;
      --text-muted: #6B7280;
      --card-shadow: 0 8px 30px rgba(0,0,0,0.05);
      --card-shadow-hover: 0 20px 35px rgba(0,240,255,0.15);
      --border-radius-card: 16px;
      --transition-base: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'SF Pro Display', system-ui, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    a, button, input {
      transition: var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航样式 */
    .navbar {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      transition: background 0.3s, box-shadow 0.3s;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.88);
      box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(to right, var(--cyan), var(--pink));
      transition: width 0.25s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF 0%, #FF3CAC 100%);
      color: white;
      border-radius: 50px;
      padding: 12px 32px;
      font-weight: 600;
      box-shadow: 0 8px 18px rgba(0,240,255,0.3);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
      transition: all 0.3s ease;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 15px 28px rgba(255,60,172,0.45);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      border-radius: 50px;
      padding: 10px 30px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      border-color: var(--pink);
      color: var(--pink);
    }
    /* 卡片动效 */
    .game-card {
      background: white;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .game-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .badge-hot {
      background: #FF3CAC;
      color: white;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 30px;
      letter-spacing: 0.5px;
    }
    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      color: var(--text-dark);
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--pink);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-item.active .faq-question i {
      transform: rotate(180deg);
      color: var(--cyan);
    }
    /* 数字动态风格 */
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF, #0099ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 移动端菜单 */
    .mobile-menu {
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.4rem; }
      h2 { font-size: 2rem; }
    }