/* roulang page: index */
:root {
      --electric-blue: #0AABF5;
      --deep-space: #0B0E14;
      --deep-indigo: #111827;
      --neon-cyan: #00F0FF;
      --text-primary: #F1F5F9;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --border-glass: rgba(255,255,255,0.08);
      --card-bg: rgba(15,23,42,0.6);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --shadow-glow: 0 0 18px rgba(10,171,245,0.5);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      padding: 0;
      background-color: var(--deep-space);
      color: var(--text-primary);
      font-family: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }
    
    button, input {
      font-family: inherit;
    }
    
    /* 容器 */
    .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;
      }
    }
    
    /* 沉浸式胶囊导航 PC */
    .nav-blur {
      background: rgba(11, 14, 20, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease;
    }
    
    .nav-scrolled {
      background: rgba(11, 14, 20, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    
    .nav-capsule {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(255,255,255,0.04);
      border-radius: 40px;
      padding: 6px 24px;
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.08);
    }
    
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      padding: 8px 16px;
      border-radius: 24px;
      transition: all 0.25s ease;
      position: relative;
    }
    
    .nav-link:hover {
      color: #fff;
      background: rgba(255,255,255,0.08);
    }
    
    .nav-link.active {
      color: #fff;
      font-weight: 600;
    }
    
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--electric-blue);
      border-radius: 2px;
      box-shadow: 0 0 8px var(--electric-blue);
    }
    
    /* 发光按钮 */
    .btn-glow {
      background: linear-gradient(135deg, #0AABF5 0%, #0D8BD9 100%);
      color: #fff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    
    .btn-glow:hover {
      box-shadow: 0 0 28px rgba(10,171,245,0.8);
      transform: scale(1.03);
    }
    
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.25);
      color: #fff;
      font-weight: 500;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      backdrop-filter: blur(8px);
      transition: all 0.25s ease;
      cursor: pointer;
    }
    
    .btn-ghost:hover {
      border-color: var(--electric-blue);
      background: rgba(10,171,245,0.1);
      color: #fff;
    }
    
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: all 0.3s ease;
    }
    
    .glass-card:hover {
      background: rgba(20, 30, 50, 0.7);
      border-color: rgba(255,255,255,0.2);
      transform: translateY(-4px);
    }
    
    /* 数据发光字 */
    .stat-glow {
      font-weight: 800;
      color: #fff;
      text-shadow: 0 0 12px rgba(0,240,255,0.7);
      font-size: 2.5rem;
    }
    
    /* FAQ 折叠面板 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    
    .faq-question {
      background: var(--deep-indigo);
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-radius: 12px;
      transition: background 0.2s;
    }
    
    .faq-question:hover {
      background: #1e293b;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      background: rgba(255,255,255,0.02);
      color: #CBD5E1;
      padding: 0 24px;
      border-radius: 0 0 12px 12px;
    }
    
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 18px 24px;
    }
    
    .faq-arrow {
      transition: transform 0.3s ease;
      font-size: 1.2rem;
    }
    
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }
    
    /* 输入框 */
    .input-glow {
      background: rgba(0,0,0,0.4);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-input);
      padding: 14px 18px;
      color: #fff;
      transition: all 0.25s;
      width: 100%;
    }
    
    .input-glow:focus {
      outline: none;
      border-color: var(--electric-blue);
      box-shadow: 0 0 15px rgba(10,171,245,0.5);
    }
    
    /* Hero 动画 */
    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(20px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    
    .hero-title {
      animation: fadeInUp 0.8s ease forwards;
    }
    
    .hero-sub {
      animation: fadeInUp 0.8s 0.2s ease forwards;
      opacity: 0;
      animation-fill-mode: forwards;
    }
    
    .hero-cta {
      animation: fadeInUp 0.8s 0.4s ease forwards;
      opacity: 0;
      animation-fill-mode: forwards;
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: rgba(11, 14, 20, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.1);
    }
    
    @media (max-width: 768px) {
      .stat-glow {
        font-size: 2rem;
      }
    }