/* roulang page: index */
:root {
      --bg-light: #F8F9FA;
      --bg-white: #FFFFFF;
      --bg-dark: #0F1115;
      --primary: #1A1D20;
      --accent: #00E599;
      --accent-hover: #00C885;
      --text-main: #111215;
      --text-muted: #4A4F55;
      --text-sub: #6C757D;
      --border-light: rgba(0, 0, 0, 0.08);
      --border-dark: rgba(255, 255, 255, 0.12);
      --card-radius: 8px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
    }
    body {
      overflow-x: hidden;
      line-height: 1.7;
    }
    .tabular-num {
      font-variant-numeric: tabular-nums;
      font-feature-settings: "tnum";
    }
    .trans-smooth {
      transition: all 300ms cubic-bezier(0.16, 1, 0.3, 1);
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(0, 229, 153, 0.15), transparent 70%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
      opacity: 1;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }