/* roulang page: index */
:root {
      --primary: #0D9488;
      --primary-light: #06B6D4;
      --slate-dark: #0F172A;
      --slate-card: #1E293B;
      --slate-muted: #475569;
      --light-bg: #F8FAFC;
      --border-color: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-feature-settings: "tnum";
      scroll-behavior: smooth;
    }
    .clip-hero-slant {
      clip-path: polygon(0 0, 100% 0, 100% calc(100% - 4.5vw), 0 100%);
    }
    .badge-glow {
      box-shadow: 0 0 16px rgba(6, 182, 212, 0.45);
    }
    .hover-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .hover-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
      border-color: rgba(13, 148, 136, 0.5);
    }
    .btn-gradient {
      background: linear-gradient(135deg, #0D9488 0%, #06B6D4 100%);
      transition: all 0.3s ease;
    }
    .btn-gradient:hover {
      box-shadow: 0 10px 25px -5px rgba(13, 148, 136, 0.4);
      filter: brightness(1.06);
    }
    .tech-code-panel {
      background: #090E17;
      border: 1px solid rgba(255, 255, 255, 0.08);
      box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .clip-hero-slant {
        clip-path: none;
      }
    }