:root { --jbl4-color-primary:#0f766e; --jbl4-color-accent:#14b8a6; --jbl4-color-deep:#0f172a; --jbl4-color-bg:#f3f7f8; --jbl4-color-panel:#ffffff; --jbl4-color-soft:#e6fffb; --jbl4-color-text:#111827; --jbl4-color-muted:#64748b; --jbl4-color-border:#d7e2e5; --jbl4-color-gradient:linear-gradient(135deg,#0f766e 0%,#14b8a6 100%); }
    * { box-sizing:border-box; margin:2px; padding:2px; }
    body.jbl4-shell-body { background:var(--jbl4-color-bg); color:var(--jbl4-color-text); font:14px/1.45 Arial,"Microsoft YaHei",sans-serif; }
    a { color:inherit; text-decoration:none; } a:focus-visible { outline:2px solid var(--jbl4-color-accent); outline-offset:1px; }
    .jbl4-site-header,.jbl4-site-footer,.jbl4-page-head,.jbl4-topic-board { background:var(--jbl4-color-panel); border:1px solid var(--jbl4-color-border); }
    .jbl4-site-header { border-top:0; border-left:0; border-right:0; } .jbl4-site-footer { color:var(--jbl4-color-muted); }
    .jbl4-site-headwrap,.jbl4-site-footwrap,.jbl4-main-wrap { max-width:1080px; margin:0 auto; }
    .jbl4-site-headwrap { display:flex; align-items:center; justify-content:space-between; }
    .jbl4-site-brand,.jbl4-site-footbrand,.jbl4-page-title { color:var(--jbl4-color-primary); font-size:18px; font-weight:700; }
    .jbl4-site-nav { display:flex; overflow-x:auto; } .jbl4-site-link { padding:2px 6px; border-left:3px solid transparent; white-space:nowrap; }
    .jbl4-site-link:hover { background:var(--jbl4-color-soft); border-left-color:var(--jbl4-color-accent); }
    .jbl4-page-desc,.jbl4-breadcrumb,.jbl4-topic-date,.jbl4-site-footnote,.jbl4-site-contact { color:var(--jbl4-color-muted); }
    .jbl4-breadcrumb { background:var(--jbl4-color-panel); border:1px solid var(--jbl4-color-border); }
    .jbl4-topic-board { display:grid; grid-template-columns:1fr; }
    .jbl4-topic-row { display:grid; grid-template-columns:8px 1fr auto; align-items:center; border-bottom:1px solid var(--jbl4-color-border); min-height:38px; }
    .jbl4-topic-mark { height:28px; background:var(--jbl4-color-gradient); }
    .jbl4-topic-title { font-weight:700; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
    .jbl4-topic-date { white-space:nowrap; }
    @media (min-width:1024px) { body.jbl4-shell-body { font-size:16px; } .jbl4-topic-board { grid-template-columns:1fr 1fr 1fr; } }
  
    /* jbl4 sticky footer layout */
    html,
    body {
      min-height: 100%;
    }

    body.jbl4-shell-body {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .jbl4-main-wrap {
      width: 100%;
      flex: 1 0 auto;
    }

    .jbl4-site-footer {
      flex-shrink: 0;
      margin-top: auto;
    }