/* roulang page: index */
:root {
      --bg-titanium: #F4F6F9;
      --bg-charcoal: #12161A;
      --color-machine-gray: #1E252B;
      --accent-orange: #FF5500;
      --accent-yellow: #E5A919;
      --accent-cyan: #0E8A8A;
      --accent-green: #10B981;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-card: rgba(255, 255, 255, 0.08);
      --radius-ui: 8px;
    }
    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-titanium);
      color: #1E293B;
      overflow-x: hidden;
    }
    .shadow-industrial {
      box-shadow: 0 4px 20px -2px rgba(18, 22, 26, 0.08);
    }
    .shadow-card-dark {
      box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.45);
    }
    .hover-lift {
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease;
    }
    .hover-lift:hover {
      transform: translateY(-5px);
      box-shadow: 0 12px 28px -4px rgba(255, 85, 0, 0.18);
    }
    /* Industrial Details Summary Accordion */
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }
    details[open] {
      border-color: #FF5500;
    }