/* roulang page: index */
:root {
      --primary: #00E5A0;
      --primary-glow: rgba(0, 229, 160, 0.5);
      --accent: #FFB347;
      --bg-deep: #0B0F19;
      --bg-light: #111827;
      --glass-bg: rgba(20, 30, 40, 0.65);
      --glass-border: rgba(255, 255, 255, 0.06);
      --text-white: #FFFFFF;
      --text-light: #F1F5F9;
      --text-body: #CBD5E1;
      --text-muted: #94A3B8;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-card: 0 8px 32px rgba(0, 229, 160, 0.08);
      --shadow-card-hover: 0 16px 48px rgba(0, 229, 160, 0.2);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片 */
    .glass-panel {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.2s;
    }

    .glass-panel:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(0, 229, 160, 0.25);
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--primary);
      color: #0B0F19;
      font-weight: 600;
      border-radius: var(--radius-full);
      padding: 14px 32px;
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0, 229, 160, 0.3);
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px var(--primary-glow);
      transform: scale(1.03);
      background-color: #00f0a8;
    }

    .btn-outline {
      border: 1px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      border-radius: var(--radius-full);
      padding: 14px 32px;
      background: transparent;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline:hover {
      background-color: var(--accent);
      color: #0B0F19;
      border-color: var(--accent);
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      background: rgba(11, 15, 25, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
    }

    .nav-link {
      color: #cbd5e1;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }

    .nav-link:hover {
      color: var(--primary);
    }

    .search-input {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-full);
      padding: 10px 20px 10px 44px;
      color: white;
      outline: none;
      transition: all 0.2s;
      width: 100%;
    }

    .search-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 229, 160, 0.2);
    }

    .search-icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: #94a3b8;
    }

    /* 动态网格背景 */
    .hero-bg {
      background-color: #0B0F19;
      background-image: 
        linear-gradient(rgba(0, 229, 160, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 160, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      position: relative;
      overflow: hidden;
    }

    .hero-bg::before {
      content: "";
      position: absolute;
      top: -20%;
      right: 0;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0, 229, 160, 0.15) 0%, transparent 70%);
      pointer-events: none;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: #E2E8F0;
      font-size: 1.25rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      color: #94a3b8;
      line-height: 1.7;
      padding-left: 16px;
      border-left: 2px solid var(--primary);
      margin-left: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      color: var(--primary);
      font-size: 1.5rem;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 进度条 */
    .progress-bar {
      height: 6px;
      background: rgba(255,255,255,0.1);
      border-radius: 10px;
      overflow: hidden;
      margin-top: 8px;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary);
      border-radius: 10px;
      width: 0%;
      transition: width 1.2s ease;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .navbar .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      h1 {
        font-size: 2.8rem !important;
      }
      h2 {
        font-size: 2rem !important;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu-btn {
        display: none;
      }
    }