:root{
      --container-max: 1200px;
      --pad-x: 24px;
      --text: #111;
      --muted: #666;
      --active-bg: #e6e6e6;
    }
    html, body { margin: 0; padding: 0; background: #fff; }
    body {
      font-family: system-ui, -apple-system, "PingFang TC",
      "Noto Sans CJK TC", "Microsoft JhengHei", Arial, sans-serif;
      color: var(--text);
    }
    /* Header shell */
    header#SITE_HEADER{
      width: 100%;
      background: #fff;
    }
    .wrap{
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 12px var(--pad-x);
      display: flex;
      align-items: center;
      gap: 28px;
    }
    /* Left: branding */
    .brand{
      display: flex;
      align-items: center;
      gap: 14px;
      min-width: 320px;
      flex: 0 0 auto;
    }
    .brand img{
      width: 220px; /* adjust after you provide logo */
      height: auto;
      display: block;
    }
    .brand-text{
      line-height: 1.1;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .brand-text .zh{
      font-size: 14px;
      font-weight: 700;
      letter-spacing: .5px;
    }
    .brand-text .en{
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .6px;
    }
    /* Center: main nav */
    nav.main-nav{
      flex: 1 1 auto;
      display: flex;
      justify-content: center;
      gap: 32px;
      white-space: nowrap;
    }
    nav.main-nav a{
      text-decoration: none;
      color: var(--text);
      font-size: 22px;
      font-weight: 600;
    }
    nav.main-nav a:hover{
      text-decoration: underline;
      text-underline-offset: 6px;
    }
    /* Right: language switch */
    .lang{
      flex: 0 0 auto;
      display: flex;
      align-items: center;
      gap: 10px;
      white-space: nowrap;
    }
    .lang a{
      text-decoration: none;
      color: var(--text);
      font-size: 16px;
      font-weight: 600;
      padding: 6px 10px;
      border-radius: 2px;
    }
    .lang a.active{
      background: var(--active-bg);
    }
    /* Responsive tweaks */
    @media (max-width: 960px){
      .wrap{ gap: 18px; }
      .brand{ min-width: 260px; }
      nav.main-nav a{ font-size: 16px; }
    }
    @media (max-width: 760px){
      .wrap{
        flex-wrap: wrap;
        justify-content: space-between;
      }
      nav.main-nav{
        order: 3;
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        padding-top: 8px;
        gap: 22px;
      }
    }