/* roulang page: index */
:root {
      --deep-space: #0A0E1A;
      --deep-blue-black: #0B0F1C;
      --warm-gold: #D4A843;
      --warm-gold-light: #E5B85C;
      --ice-white: #E8F0FE;
      --text-primary: rgba(232, 240, 254, 0.95);
      --text-secondary: rgba(232, 240, 254, 0.7);
      --text-muted: rgba(232, 240, 254, 0.5);
      --glass-bg: rgba(15, 25, 45, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(255, 255, 255, 0.2);
      --gold-glow: rgba(212, 168, 67, 0.5);
      --gold-glow-soft: rgba(212, 168, 67, 0.2);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --card-radius: 16px;
      --transition-smooth: all 0.3s ease;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 大理石纹理背景噪点 (CSS生成) */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        radial-gradient(circle at 20% 30%, rgba(212,168,67,0.03) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(232,240,254,0.02) 0%, transparent 40%),
        repeating-linear-gradient(45deg, rgba(255,255,255,0.01) 0px, rgba(255,255,255,0.01) 1px, transparent 1px, transparent 20px);
      pointer-events: none;
      z-index: -1;
    }
    
    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--card-shadow), 0 0 0 1px rgba(212,168,67,0.1);
      transition: var(--transition-smooth);
    }
    
    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(212,168,67,0.2);
      transform: translateY(-4px);
    }
    
    /* 导航玻璃效果 */
    .navbar-glass {
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      height: 64px;
    }
    
    .navbar-brand {
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--ice-white);
      font-size: 1.5rem;
    }
    
    .navbar-brand span {
      color: var(--warm-gold);
    }
    
    .nav-link {
      color: var(--ice-white) !important;
      font-weight: 500;
      margin: 0 4px;
      position: relative;
      transition: color 0.2s;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--warm-gold);
      transition: width 0.3s ease;
    }
    
    .nav-link:hover {
      color: var(--warm-gold) !important;
    }
    
    .nav-link:hover::after {
      width: 70%;
    }
    
    /* 按钮系统 */
    .btn-primary-gold {
      background: linear-gradient(135deg, #D4A843 0%, #B88A2E 100%);
      color: #0A0E1A;
      font-weight: 600;
      border: none;
      padding: 12px 32px;
      border-radius: 50px;
      box-shadow: 0 0 20px rgba(212,168,67,0.5), 0 0 40px rgba(212,168,67,0.2);
      transition: all 0.3s ease;
      letter-spacing: 0.3px;
    }
    
    .btn-primary-gold:hover {
      box-shadow: 0 0 30px rgba(212,168,67,0.8), 0 0 60px rgba(212,168,67,0.3);
      transform: scale(1.03);
      color: #0A0E1A;
    }
    
    .btn-outline-gold {
      background: transparent;
      border: 1px solid rgba(212,168,67,0.6);
      color: var(--warm-gold);
      font-weight: 500;
      padding: 12px 32px;
      border-radius: 50px;
      transition: all 0.3s ease;
    }
    
    .btn-outline-gold:hover {
      background: rgba(212,168,67,0.1);
      border-color: var(--warm-gold);
      color: var(--warm-gold-light);
    }
    
    /* 底部移动Tab */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: rgba(10, 14, 26, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.08);
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1030;
      display: none;
    }
    
    .mobile-tab {
      color: var(--text-muted);
      text-decoration: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      transition: color 0.2s;
      font-weight: 500;
    }
    
    .mobile-tab i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }
    
    .mobile-tab.active {
      color: var(--warm-gold);
      text-shadow: 0 0 8px rgba(212,168,67,0.6);
    }
    
    /* 区块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--ice-white);
      margin-bottom: 1rem;
    }
    
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    
    /* Hero 区域 */
    #hero {
      min-height: 100vh;
      background: radial-gradient(circle at 30% 40%, rgba(212,168,67,0.08) 0%, transparent 50%);
      display: flex;
      align-items: center;
      position: relative;
    }
    
    .hero-h1 {
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--ice-white);
      line-height: 1.2;
    }
    
    /* 数据亮点数字 */
    .data-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--warm-gold);
      line-height: 1.2;
    }
    
    /* FAQ 手风琴定制 */
    .accordion-button {
      background: rgba(15,25,45,0.7);
      color: var(--ice-white);
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px !important;
      padding: 18px 24px;
      transition: 0.2s;
    }
    
    .accordion-button:not(.collapsed) {
      background: rgba(212,168,67,0.1);
      color: var(--warm-gold);
      border-color: rgba(212,168,67,0.3);
      box-shadow: 0 0 12px rgba(212,168,67,0.2);
    }
    
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 1rem;
    }
    
    .accordion-body {
      background: rgba(15,25,45,0.5);
      color: var(--text-secondary);
      border-radius: 0 0 12px 12px;
      padding: 20px 24px;
    }
    
    /* 证言卡片竖线 */
    .testimonial-accent {
      border-left: 3px solid var(--warm-gold);
      padding-left: 20px;
    }
    
    /* 页脚 */
    footer a {
      color: var(--text-secondary);
      text-decoration: none;
      transition: color 0.2s;
    }
    
    footer a:hover {
      color: var(--warm-gold);
    }
    
    /* 响应式 */
    @media (max-width: 992px) {
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
      .navbar .nav-link {
        display: none; /* 桌面菜单隐藏，使用汉堡或底部tab */
      }
      .navbar-toggler {
        display: block;
      }
      .hero-h1 {
        font-size: 2.5rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }
    
    @media (min-width: 992px) {
      .mobile-bottom-nav {
        display: none;
      }
    }
    
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(232, 240, 254, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }