/* roulang page: index */
:root {
      --c-primary: #00D084;
      --c-primary-hover: #0FA97F;
      --c-accent: #F59E0B;
      --c-bg-dark: #0F172A;
      --c-surface: #1E293B;
      --c-surface-card: #182234;
      --c-text-main: #F8FAFC;
      --c-text-muted: #94A3B8;
      --c-border: #334155;
      --c-border-highlight: #00D084;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      background-color: var(--c-bg-dark);
      color: var(--c-text-main);
      line-height: 1.7;
      overflow-x: hidden;
      padding-bottom: 70px;
    }

    @media (min-width: 768px) {
      body {
        padding-bottom: 0;
      }
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease-in-out;
    }

    .container-custom {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 1.25rem;
    }

    .grid-mesh {
      background-image: radial-gradient(rgba(0, 208, 132, 0.08) 1px, transparent 0);
      background-size: 28px 28px;
    }

    .card-glow {
      background: var(--c-surface);
      border: 1px solid var(--c-border);
      border-radius: 6px;
      transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }

    .card-glow:hover {
      transform: translateY(-3px);
      border-color: rgba(0, 208, 132, 0.6);
      box-shadow: 0 8px 24px rgba(0, 208, 132, 0.12);
    }

    .btn-tactical {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background-color: var(--c-primary);
      color: #051410;
      font-weight: 600;
      padding: 0.75rem 1.6rem;
      border-radius: 4px;
      border: 1px solid var(--c-primary);
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-tactical:hover {
      background-color: var(--c-primary-hover);
      box-shadow: 0 0 15px rgba(0, 208, 132, 0.4);
    }

    .btn-tactical-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: rgba(30, 41, 59, 0.6);
      color: var(--c-text-main);
      font-weight: 600;
      padding: 0.75rem 1.6rem;
      border-radius: 4px;
      border: 1px solid var(--c-border);
      cursor: pointer;
      backdrop-filter: blur(8px);
      transition: all 0.2s ease;
    }

    .btn-tactical-outline:hover {
      border-color: var(--c-primary);
      color: var(--c-primary);
      background: rgba(0, 208, 132, 0.05);
    }

    .badge-radar {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.25rem 0.65rem;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.03em;
      border-radius: 3px;
      background: rgba(0, 208, 132, 0.12);
      color: var(--c-primary);
      border: 1px solid rgba(0, 208, 132, 0.35);
    }

    .badge-radar::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--c-primary);
      animation: pulseRadar 2s infinite;
    }

    @keyframes pulseRadar {
      0% { box-shadow: 0 0 0 0 rgba(0, 208, 132, 0.8); }
      70% { box-shadow: 0 0 0 7px rgba(0, 208, 132, 0); }
      100% { box-shadow: 0 0 0 0 rgba(0, 208, 132, 0); }
    }

    .section-spacing {
      padding: 5rem 0;
      position: relative;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--c-text-main);
      margin-bottom: 0.75rem;
      line-height: 1.3;
    }

    .section-subtitle {
      color: var(--c-text-muted);
      font-size: 1rem;
      max-width: 680px;
      line-height: 1.75;
    }

    /* 移动端菜单抽屉 */
    #mobileMenu.active {
      transform: translateX(0);
    }

    /* 手风琴过渡 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.35s ease-in-out;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    /* Tab 激活样式 */
    .tab-btn.active {
      background: var(--c-primary);
      color: #0a1814;
      border-color: var(--c-primary);
    }