/* roulang page: index */
/* 自定义 CSS 变量与全局风格 */
    :root {
      --deep-bg: #0B0E1A;
      --gradient-bg: linear-gradient(135deg, #0B0E1A 0%, #121A2C 100%);
      --gold: #D4A843;
      --gold-dark: #C89B3C;
      --flame: #F04E30;
      --cloud-white: #F5F3EE;
      --text-light: #B0C4DE;
      --text-muted: #7B8CA8;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --gold-glow: 0 0 20px rgba(212, 168, 67, 0.5);
      --gold-border: rgba(212, 168, 67, 0.4);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-tag: 8px;
      --transition-smooth: all 0.3s ease;
      --hero-title-size: clamp(2.5rem, 8vw, 3.8rem);
      --nav-blur: rgba(11, 14, 26, 0.75);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background: var(--deep-bg);
      color: var(--text-light);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 30% 50%, rgba(212, 168, 67, 0.05) 0%, transparent 40%);
      overflow-x: hidden;
    }

    /* 沉浸式玻璃导航 */
    .glass-nav {
      background: var(--nav-blur);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(212, 168, 67, 0.25);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      transition: var(--transition-smooth);
    }
    .nav-blur-strong {
      background: rgba(11, 14, 26, 0.92);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(212, 168, 67, 0.5);
    }

    .logo-gold {
      background: linear-gradient(135deg, #D4A843 0%, #F5E6B8 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-weight: 700;
      letter-spacing: 1px;
    }

    .nav-link {
      color: var(--text-light);
      transition: var(--transition-smooth);
      position: relative;
      font-weight: 500;
    }
    .nav-link:hover, .nav-link:focus-visible {
      color: var(--gold);
      outline: none;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold);
      box-shadow: 0 0 10px var(--gold);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-gold {
      background: linear-gradient(135deg, #D4A843, #C89B3C);
      color: #0B0E1A;
      font-weight: 600;
      border-radius: var(--radius-btn);
      box-shadow: var(--gold-glow);
      transition: var(--transition-smooth);
      padding: 0.75rem 1.8rem;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-gold:hover {
      box-shadow: 0 0 35px rgba(240, 78, 48, 0.7), 0 0 25px rgba(212, 168, 67, 0.6);
      transform: translateY(-2px);
      background: linear-gradient(135deg, #E5B854, #D4A843);
      color: #0B0E1A;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: white;
      border-radius: var(--radius-btn);
      font-weight: 600;
      padding: 0.75rem 1.8rem;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }
    .btn-ghost:hover {
      border-color: var(--gold);
      background: rgba(212, 168, 67, 0.08);
      color: var(--gold);
      box-shadow: 0 0 15px rgba(212,168,67,0.3);
      transform: translateY(-2px);
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--glass-shadow);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: var(--gold-border);
      box-shadow: 0 15px 35px rgba(0,0,0,0.5), 0 0 25px rgba(212,168,67,0.2);
      transform: translateY(-8px);
    }

    .text-gold-glow {
      color: var(--gold);
      text-shadow: 0 0 15px rgba(212,168,67,0.3);
    }
    .highlight-gold {
      color: var(--gold);
      font-weight: 700;
    }

    /* 背景动态光效 */
    .hero-ambient {
      background: radial-gradient(ellipse at 70% 30%, rgba(212, 168, 67, 0.08) 0%, transparent 50%);
      position: relative;
    }
    .floating-particles {
      position: absolute;
      inset: 0;
      overflow: hidden;
      pointer-events: none;
    }
    .particle {
      position: absolute;
      background: rgba(212, 168, 67, 0.25);
      border-radius: 50%;
      filter: blur(2px);
      animation: float 18s infinite alternate;
    }
    @keyframes float {
      0% { transform: translate(0, 0) scale(1); opacity: 0.1;}
      50% { transform: translate(120px, -30px) scale(1.5); opacity: 0.25;}
      100% { transform: translate(-20px, 25px) scale(0.8); opacity: 0.1;}
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      color: white;
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--gold);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      color: var(--text-light);
      padding-right: 1rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-gold-icon {
      color: var(--gold);
      font-size: 0.9rem;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-gold-icon {
      transform: rotate(45deg);
    }

    /* 汉堡菜单全屏面板 */
    .mobile-menu {
      position: fixed;
      inset: 0;
      background: rgba(8, 10, 20, 0.96);
      backdrop-filter: blur(30px);
      z-index: 60;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      display: none;
    }
    .mobile-menu.open {
      display: flex;
    }