/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #10B981;
      --accent-hover: #059669;
      --highlight: #F59E0B;
      --cyan: #06B6D4;
      --bg-light: #F8FAFC;
      --bg-dark: #0B1120;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 30px -4px rgba(16, 185, 129, 0.16);
    }

    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }

    .custom-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    .tech-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .tech-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(16, 185, 129, 0.3);
    }

    .gradient-hero {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(11, 17, 32, 0.96) 100%), url('/assets/images/6de555027c862b6b.webp') center/cover no-repeat;
    }

    .nav-blur {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      background-color: rgba(255, 255, 255, 0.92);
    }

    .btn-gradient {
      background: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      opacity: 0.95;
      box-shadow: 0 8px 20px -2px rgba(16, 185, 129, 0.35);
      transform: translateY(-1px);
    }

    .accent-border-l {
      border-left: 3px solid #10B981;
    }