:root{--zd-fg:#222;--zd-muted:#888;--zd-line:#e5e5e5;--zd-accent:#3b6ea5;--zd-bg:#fafafa}*{box-sizing:border-box}body,html{background:var(--zd-bg);color:var(--zd-fg);font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;margin:0;padding:0}a{color:inherit;text-decoration:none}.zd-shell{display:flex;flex-direction:column;min-height:100vh}.zd-topbar{align-items:center;background:#fff;border-bottom:1px solid var(--zd-line);display:flex;gap:1rem;padding:.75rem 1.25rem}.zd-brand{color:var(--zd-accent);font-weight:700}.zd-nav a{color:var(--zd-muted)}.zd-main{flex:1;margin:0 auto;max-width:1000px;padding:1.25rem;width:100%}.zd-chip,.zd-muted{color:var(--zd-muted)}.zd-chip{border:1px solid var(--zd-line);border-radius:999px;display:inline-block;font-size:.75rem;margin:0 .25rem .25rem 0;padding:.05rem .5rem}.zd-btn{background:#fff;border:1px solid var(--zd-line);border-radius:6px;cursor:pointer;padding:.4rem .9rem}.zd-btn:disabled{cursor:not-allowed;opacity:.4}.zd-tag-source{color:var(--zd-muted);font-size:.75rem}