/* roulang page: index */
:root {
      --primary: #0A0F1E;
      --accent: #00F0FF;
      --danger: #FF4D6D;
      --glass-bg: rgba(10,15,30,0.7);
      --glass-border: rgba(0,240,255,0.15);
      --text-strong: #FFFFFF;
      --text-soft: rgba(255,255,255,0.7);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --glow: 0 0 30px rgba(0,240,255,0.3);
      --radius-lg: 24px;
      --radius-xl: 50px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'DIN Alternate', 'Arial', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--primary);
      color: var(--text-strong);
      font-family: var(--font-heading);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow), inset 0 1px 0 rgba(255,255,255,0.05);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.5);
      transform: translateY(-6px);
      box-shadow: 0 20px 40px rgba(0,240,255,0.15), inset 0 1px 0 rgba(255,255,255,0.08);
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--radius-xl);
      padding: 14px 38px;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      font-size: 1rem;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: #FFFFFF;
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      font-weight: 700;
      border-radius: var(--radius-xl);
      padding: 12px 36px;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: var(--accent);
      color: var(--primary);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(10,15,30,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }
    .nav-link {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      margin: 0 20px;
      text-decoration: none;
      letter-spacing: 0.5px;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link:focus {
      color: var(--accent);
      outline: none;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 8px var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after, .nav-link:focus::after {
      width: 100%;
    }
    .logo {
      font-weight: 800;
      font-size: 1.8rem;
      color: white;
      text-decoration: none;
      display: flex;
      align-items: center;
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--accent);
      margin-left: 5px;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }
    @media (min-width: 1025px) {
      .mobile-menu, .mobile-drawer {
        display: none !important;
      }
    }
    .mobile-drawer {
      position: fixed;
      top: 80px;
      left: 0;
      width: 100%;
      background: rgba(10,15,30,0.96);
      backdrop-filter: blur(25px);
      flex-direction: column;
      padding: 30px;
      border-bottom: 1px solid var(--accent);
      z-index: 999;
      display: none;
    }
    .mobile-drawer a {
      display: block;
      padding: 16px 0;
      font-size: 1.5rem;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      color: white;
      text-decoration: none;
    }
    /* Hero背景 */
    .hero-bg {
      background: linear-gradient(0deg, rgba(10,15,30,0.75) 0%, rgba(10,15,30,0.55) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }
    /* 手风琴 */
    .faq-item {
      border: 1px solid rgba(255,255,255,0.08);
      background: rgba(255,255,255,0.02);
      border-radius: 16px;
      margin-bottom: 16px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .faq-item.active {
      border-color: rgba(0,240,255,0.4);
      background: rgba(255,255,255,0.05);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 28px;
      color: var(--text-soft);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .icon-accent {
      color: var(--accent);
    }
    /* 统计数字 */
    .stat-number {
      font-family: var(--font-number);
      color: var(--danger);
      font-weight: 700;
    }
    /* 输入框 */
    .form-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 40px;
      padding: 14px 20px;
      width: 100%;
      color: white;
      outline: none;
      transition: 0.2s;
    }
    .form-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    footer a {
      color: rgba(255,255,255,0.6);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--accent);
    }