:root{
  --bg:#f5f6f8; --panel:#fff; --border:#e3e6ea; --text:#1f2329; --muted:#8a9099;
  --accent:#3b6cff; --accent-soft:#eaf0ff; --ok:#2e9e5b; --warn:#d9822b; --err:#d64545;
  --code:#2b2f36; --mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;
}
*{box-sizing:border-box;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);}
.topbar{display:flex;align-items:center;gap:16px;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;}
.brand{font-weight:700;font-size:16px;}
.tabs{display:flex;gap:6px;flex-wrap:wrap;}
.tab{border:1px solid var(--border);background:#fff;color:var(--text);padding:6px 12px;border-radius:8px;cursor:pointer;font-size:13px;}
.tab.active{background:var(--accent);color:#fff;border-color:var(--accent);}
main{padding:18px;max-width:1320px;margin:0 auto;}
.io{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
@media(max-width:900px){.io{grid-template-columns:1fr;}}
.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;display:flex;flex-direction:column;overflow:hidden;}
.panel-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--border);font-size:13px;font-weight:600;gap:8px;flex-wrap:wrap;}
.actions{display:flex;gap:6px;flex-wrap:wrap;align-items:center;}
.actions label{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:4px;}
.actions input[type=number]{font:inherit;padding:3px 6px;border:1px solid var(--border);border-radius:6px;width:54px;}
button{font:inherit;font-size:12px;padding:5px 10px;border:1px solid var(--border);background:#fff;border-radius:7px;cursor:pointer;color:var(--text);}
button:hover{background:var(--accent-soft);border-color:var(--accent);}
button.danger:hover{background:#fdeaea;border-color:var(--err);color:var(--err);}
textarea{width:100%;border:none;outline:none;resize:vertical;padding:12px;font-family:var(--mono);font-size:13px;line-height:1.5;min-height:340px;color:var(--code);background:#fbfcfd;}
#json-output{min-height:220px;background:#fbfcfd;color:var(--code);}
.status{padding:6px 12px;font-size:12px;color:var(--muted);border-top:1px solid var(--border);min-height:14px;}
.status.ok{color:var(--ok);} .status.warn{color:var(--warn);} .status.error{color:var(--err);}
.tree-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-top:1px solid var(--border);font-size:13px;font-weight:600;flex-wrap:wrap;gap:8px;}
.tree{padding:8px 12px;font-family:var(--mono);font-size:13px;line-height:1.6;max-height:520px;overflow:auto;}
.tn-row{display:flex;align-items:center;gap:6px;padding:2px 0;border-radius:6px;}
.tn-row:hover{background:var(--accent-soft);}
.toggle{width:16px;text-align:center;cursor:pointer;color:var(--muted);user-select:none;flex:0 0 auto;}
.toggle.leaf{cursor:default;color:#c2c7ce;}
.tn-key{color:#1f6feb;font-weight:600;}
.tn-sum{color:var(--muted);}
.tn-val{color:#0b8043;}
.tn-val.string{color:#b5691f;}
.tn-val.number{color:#1f6feb;}
.tn-val.boolean{color:#8250df;}
.tn-val.null{color:var(--muted);}
.tn-children{margin-left:18px;border-left:1px dashed var(--border);padding-left:6px;}
.tn-copy{margin-left:auto;display:none;gap:4px;}
.tn-row:hover .tn-copy{display:flex;}
.tn-copy button{padding:2px 8px;font-size:11px;}
.save-panel{margin-top:16px;}
.save-bar{display:flex;gap:8px;padding:10px 12px;border-bottom:1px solid var(--border);}
.save-bar input{flex:1;padding:6px 10px;border:1px solid var(--border);border-radius:7px;font:inherit;font-size:13px;}
.save-list{list-style:none;margin:0;padding:6px;max-height:260px;overflow:auto;}
.save-item{display:flex;align-items:center;gap:8px;padding:8px;border-bottom:1px solid var(--border);font-size:13px;}
.save-item:last-child{border-bottom:none;}
.si-name{flex:1;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.si-time{color:var(--muted);font-size:11px;}
.empty{color:var(--muted);padding:14px;text-align:center;font-size:13px;}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:#1f2329;color:#fff;padding:8px 16px;border-radius:8px;font-size:13px;opacity:0;pointer-events:none;transition:.25s;z-index:100;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}