/* roulang page: index */
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css box-sizing:border-box');

    :root {
      --lava: #F04E23;
      --lava-light: #FF6B3D;
      --deepspace: #0B0C10;
      --darkgray: #1A1D23;
      --card: #21252B;
      --brightcyan: #00E5FF;
      --softtext: #E0E0E0;
      --muted: #9E9E9E;
      --line: #2A2E35;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--deepspace);
      color: var(--softtext);
      margin: 0;
      padding: 0;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    @media (min-width: 768px) {
      .container-custom {
        padding: 0 2rem;
      }
    }

    /* 导航固定 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background-color: rgba(11, 12, 16, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--line);
    }

    .nav-link {
      color: var(--muted);
      transition: color 0.2s, border-color 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }

    .nav-link:hover {
      color: var(--lava);
      border-bottom-color: var(--lava);
    }

    /* 汉堡菜单全屏覆盖 */
    .mobile-menu {
      background-color: rgba(11, 12, 16, 0.98);
      backdrop-filter: blur(16px);
    }

    /* 按钮样式 */
    .btn-primary {
      background: linear-gradient(135deg, #F04E23 0%, #FF6B3D 100%);
      color: white;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 14px rgba(240, 78, 35, 0.4);
      border: none;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 8px 24px rgba(240, 78, 35, 0.6);
      transform: translateY(-1px);
    }

    .btn-outline {
      border: 1px solid var(--brightcyan);
      color: var(--brightcyan);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
      background: transparent;
    }

    .btn-outline:hover {
      background-color: rgba(0, 229, 255, 0.1);
      box-shadow: 0 0 15px rgba(0, 229, 255, 0.25);
    }

    .btn-ghost {
      color: var(--softtext);
      font-weight: 500;
      position: relative;
      transition: 0.2s;
    }

    .btn-ghost:hover {
      color: var(--lava);
      text-decoration: underline;
    }

    /* Hero 光斑 */
    .hero-glow {
      background: radial-gradient(circle at 80% 20%, rgba(240, 78, 35, 0.25) 0%, transparent 50%);
    }

    .glow-cyan {
      background: radial-gradient(circle at 20% 80%, rgba(0, 229, 255, 0.15) 0%, transparent 50%);
    }

    /* 卡片 */
    .card-dark {
      background-color: var(--card);
      border: 1px solid var(--line);
      border-radius: 12px;
      box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    }

    .service-large-card {
      background-color: var(--card);
      border: 1px solid var(--line);
      border-radius: 12px;
      overflow: hidden;
      transition: all 0.3s;
    }

    .service-large-card:hover {
      border-color: var(--brightcyan);
      box-shadow: 0 8px 30px rgba(0, 229, 255, 0.2);
    }

    .case-card {
      background-color: var(--card);
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--line);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .case-card:hover {
      box-shadow: 0 12px 28px rgba(240, 78, 35, 0.25);
      border-color: var(--lava);
    }

    /* 时间轴节点 */
    .timeline-node {
      width: 16px;
      height: 16px;
      background-color: var(--lava);
      border-radius: 50%;
      box-shadow: 0 0 0 4px var(--brightcyan);
    }

    /* 手风琴 */
    details summary::-webkit-details-marker {
      display: none;
    }
    details summary {
      list-style: none;
    }

    /* 滚动容器 */
    .case-scroll {
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .case-scroll > * {
      scroll-snap-align: start;
    }
    .case-scroll::-webkit-scrollbar {
      display: none;
    }