/* roulang page: index */
:root {
      --bg-deep: #0B0F19;
      --bg-card: rgba(19, 26, 43, 0.75);
      --cyan: #00E5FF;
      --orange: #FF8F1F;
      --white: #ffffff;
      --gray-light: #b0c0d0;
      --gray-mid: #6b7c93;
      --border-soft: rgba(0, 229, 255, 0.18);
      --border-glow: rgba(0, 229, 255, 0.4);
      --card-shadow: 0 12px 32px rgba(0,0,0,0.55), inset 0 0 0 1px rgba(0,229,255,0.12);
      --card-radius: 20px;
      --btn-radius: 50px;
      --font-head: 'Segoe UI', '思源黑体', 'Helvetica Neue', system-ui, sans-serif;
      --font-mono: 'Fira Code', 'Courier New', monospace;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background: radial-gradient(circle at 30% 10%, #131A2B 0%, #0B0F19 85%);
      color: var(--white);
      font-family: var(--font-head);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }

    a {
      text-decoration: none;
      color: var(--cyan);
      transition: var(--transition);
    }

    a:hover {
      color: var(--orange);
    }

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

    /* 自定义网格纹理背景（用于玻璃卡片增强数据感） */
    .glass-panel {
      background: var(--bg-card);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--border-soft);
      border-radius: var(--card-radius);
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
    }

    .glass-panel::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: 
        linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px);
      background-size: 24px 24px;
      pointer-events: none;
      border-radius: inherit;
    }

    .btn-cyan {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      border-radius: var(--btn-radius);
      padding: 0.7rem 2rem;
      font-weight: 600;
      transition: all 0.3s;
      backdrop-filter: blur(8px);
    }

    .btn-cyan:hover {
      background: rgba(0,229,255,0.12);
      border-color: var(--white);
      color: var(--white);
      box-shadow: 0 0 14px rgba(0,229,255,0.5);
      transform: translateY(-2px);
    }

    .btn-orange {
      background: var(--orange);
      border: none;
      color: #0B0F19;
      font-weight: 700;
      border-radius: var(--btn-radius);
      padding: 0.8rem 2.4rem;
      transition: all 0.3s;
      letter-spacing: 0.3px;
      box-shadow: 0 8px 18px rgba(255,143,31,0.35);
    }

    .btn-orange:hover {
      background: #FFA64D;
      color: #000;
      box-shadow: 0 0 24px rgba(255,143,31,0.7);
      transform: translateY(-3px);
    }

    /* 导航 chip 样式 */
    .navbar {
      background: rgba(8, 12, 22, 0.8);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0,229,255,0.15);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: background 0.3s;
    }

    .nav-chip {
      background: rgba(19, 26, 43, 0.7);
      border: 1px solid rgba(0,229,255,0.2);
      color: var(--gray-light);
      border-radius: 40px;
      padding: 0.5rem 1.3rem;
      font-weight: 500;
      font-size: 0.9rem;
      margin: 0 0.2rem;
      transition: all 0.25s;
      white-space: nowrap;
    }

    .nav-chip.active, .nav-chip:hover {
      background: var(--cyan);
      color: #0B0F19;
      border-color: var(--cyan);
      font-weight: 700;
      box-shadow: 0 0 18px rgba(0,229,255,0.5);
    }

    .logo-text {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-text span {
      color: var(--cyan);
    }

    /* Hero 指标微卡片 */
    .metric-mini {
      background: rgba(19, 26, 43, 0.65);
      backdrop-filter: blur(12px);
      border-radius: 18px;
      padding: 1rem 1.5rem;
      border: 1px solid rgba(0,229,255,0.2);
    }

    .count-up {
      font-family: var(--font-mono);
      font-weight: 600;
      color: var(--cyan);
      font-size: 2rem;
      line-height: 1.2;
    }

    /* 服务区错落栅格 */
    .service-large {
      height: 100%;
    }

    .shimmer-effect {
      position: relative;
      overflow: hidden;
    }
    .shimmer-effect::after {
      content: "";
      position: absolute;
      top: 0;
      left: -100%;
      width: 40%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(0,229,255,0.08), transparent);
      animation: shimmer 5s infinite;
    }
    @keyframes shimmer {
      100% { left: 200%; }
    }

    /* 对比区暗淡/发光 */
    .compare-dim {
      background: rgba(30, 35, 48, 0.7);
      border: 1px solid rgba(255,255,255,0.08);
    }
    .compare-bright {
      background: rgba(0, 229, 255, 0.07);
      border: 1px solid var(--cyan);
      box-shadow: 0 0 28px rgba(0,229,255,0.25);
    }

    .faq-accordion .accordion-button {
      background: var(--bg-card);
      color: white;
      font-weight: 600;
      border: 1px solid var(--border-soft);
      border-radius: 14px !important;
      box-shadow: none;
      padding: 1.2rem 1.8rem;
    }
    .faq-accordion .accordion-button:not(.collapsed) {
      background: rgba(0,229,255,0.08);
      border-color: var(--cyan);
      color: var(--cyan);
      box-shadow: 0 0 20px rgba(0,229,255,0.3);
    }
    .faq-accordion .accordion-body {
      background: rgba(11,15,25,0.7);
      color: var(--gray-light);
      border-radius: 0 0 14px 14px;
    }

    footer {
      background: #05080f;
      border-top: 1px solid rgba(0,229,255,0.1);
    }

    @media (max-width: 768px) {
      .navbar-nav {
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: 0.4rem;
        padding: 0.5rem 0;
      }
      .nav-chip {
        font-size: 0.8rem;
        padding: 0.4rem 1rem;
      }
      .logo-text {
        font-size: 1.5rem;
      }
    }