/* roulang page: index */
:root {
      --bg-dark: #0A0E17;
      --card-bg: #111827;
      --card-hover: #162032;
      --text-main: #F8FAFC;
      --text-sub: #94A3B8;
      --cyan-bright: #00F2FE;
      --neon-green: #38EF7D;
      --neon-orange: #FF6B4A;
      --border-line: rgba(255, 255, 255, 0.08);
      --glow-shadow: 0 20px 40px -15px rgba(0, 242, 254, 0.15);
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* 文本渐变 */
    .text-gradient-cyan {
      background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    
    .text-gradient-orange {
      background: linear-gradient(135deg, #FF8A00 0%, #FF6B4A 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 边框微光卡片 */
    .tech-card {
      background: rgba(17, 24, 39, 0.85);
      border: 1px solid var(--border-line);
      backdrop-filter: blur(12px);
      transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-card:hover {
      border-color: rgba(0, 242, 254, 0.35);
      transform: translateY(-4px);
      box-shadow: var(--glow-shadow);
    }

    /* 胶囊数据徽章 */
    .badge-capsule {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.025em;
      border: 1px solid rgba(0, 242, 254, 0.25);
      background: rgba(0, 242, 254, 0.08);
      color: #00F2FE;
    }

    .badge-orange {
      border-color: rgba(255, 107, 74, 0.25);
      background: rgba(255, 107, 74, 0.08);
      color: #FF6B4A;
    }

    .badge-green {
      border-color: rgba(56, 239, 125, 0.25);
      background: rgba(56, 239, 125, 0.08);
      color: #38EF7D;
    }

    /* 按钮系统 */
    .btn-gradient-cyan {
      background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
      color: #04101A;
      font-weight: 700;
      transition: all 0.25s ease;
      box-shadow: 0 4px 20px -2px rgba(0, 242, 254, 0.35);
    }
    .btn-gradient-cyan:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 26px rgba(0, 242, 254, 0.5);
    }

    .btn-outline-tech {
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.03);
      color: #E2E8F0;
      transition: all 0.25s ease;
    }
    .btn-outline-tech:hover {
      border-color: #00F2FE;
      color: #00F2FE;
      background: rgba(0, 242, 254, 0.05);
    }

    /* 栅格发光线条底纹 */
    .grid-pattern {
      background-image: radial-gradient(rgba(0, 242, 254, 0.12) 1px, transparent 1px);
      background-size: 32px 32px;
    }

    /* 移动端菜单切换 */
    #mobile-menu {
      transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out;
    }
    #mobile-menu.hidden-menu {
      max-height: 0;
      opacity: 0;
      pointer-events: none;
      overflow: hidden;
    }
    #mobile-menu.show-menu {
      max-height: 500px;
      opacity: 1;
      pointer-events: auto;
    }