:root {
  --bg: #f2f4f1;
  --surface: #fbfcfa;
  --surface-2: #f6f8f4;
  --border: #e2e7df;
  --ink: #2e3531;
  --ink-2: #58635b;
  --muted: #8b958d;
  --sage: #7d9b84;
  --sage-deep: #4f7258;
  --sage-soft: rgba(125, 155, 132, 0.16);
  --syn-bg: #dcead9;
  --num: #7a6347;
  --str: #4c7a5b;
  --key: #3f5a49;
  --diff-del: #f0dcd8;
  --diff-add: #dcebda;
  --radius: 10px;
  --mono: "Cascadia Code", "SF Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.6 "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 18px 28px 10px;
  max-width: 1400px;
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 14px; height: 14px; border-radius: 4px;
  background: var(--sage);
  box-shadow: 0 0 0 4px var(--sage-soft);
}
.brand h1 { font-size: 18px; margin: 0; font-weight: 600; letter-spacing: 1px; }
.today-date { margin: 0; color: var(--muted); font-size: 13px; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  padding: 8px 28px 40px;
  max-width: 1400px;
  margin: 0 auto;
}

.work { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.pathbar { display: flex; align-items: center; gap: 10px; }
#pathInput {
  flex: 1;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
}
#pathInput:focus { border-color: var(--sage); box-shadow: 0 0 0 3px var(--sage-soft); }
.path-msg { color: var(--muted); font-size: 12px; white-space: nowrap; }
.path-msg.err { color: #b4553f; }

.card, .editor, .viewer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.editor { padding: 12px 14px; }
.editor-head, .viewer-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin-bottom: 8px;
}
.editor-title { font-weight: 600; color: var(--ink-2); font-size: 13px; }
#input {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--ink);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  outline: none;
}
#input:focus { border-color: var(--sage); box-shadow: 0 0 0 3px var(--sage-soft); }
.toolbar {
  display: flex; align-items: center; gap: 14px; margin-top: 8px; flex-wrap: wrap;
}
.opt { color: var(--ink-2); font-size: 12px; display: flex; gap: 6px; align-items: center; cursor: pointer; }
.opt input { accent-color: var(--sage-deep); }
.status { font-size: 12px; color: var(--muted); }
.status.ok { color: var(--sage-deep); }
.status.warn { color: #9a6b2f; }
.status.err { color: #b4553f; }

.viewer { padding: 12px 14px; min-height: 200px; }
.viewer-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.legend { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 5px; }
.chip { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -2px; }
.chip.syn { background: var(--syn-bg); border: 1px dashed var(--sage-deep); }
.chip.del { background: var(--diff-del); }
.chip.add { background: var(--diff-add); }

.btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-2);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--sage); color: var(--sage-deep); }
.btn.primary { background: var(--sage); border-color: var(--sage); color: #fff; }
.btn.primary:hover { background: var(--sage-deep); border-color: var(--sage-deep); color: #fff; }
.btn.primary:disabled { background: var(--border); border-color: var(--border); color: var(--muted); cursor: default; }
.btn.ghost { background: transparent; }
.btn.tiny { padding: 3px 10px; font-size: 12px; }

/* ---- JSON tree ---- */
.tree { font-family: var(--mono); font-size: 13px; overflow-x: auto; }
.tree .empty { color: var(--muted); font-family: inherit; padding: 8px 2px; }
.node { }
.node.collapsed > .body { display: none; }
.node.collapsed > .row .ellipsis { display: inline; }
.node > .row .ellipsis { display: none; color: var(--muted); }
.row { display: flex; align-items: flex-start; line-height: 1.7; }
.body { margin-left: 22px; }
.caret {
  width: 16px; flex: none; text-align: center; cursor: pointer; user-select: none;
  color: var(--muted); font-size: 11px; border-radius: 4px; line-height: 1.7;
  transition: transform .12s ease;
}
.node.collapsed > .row:first-child > .caret { transform: rotate(-90deg); }
.caret:hover { color: var(--sage-deep); background: var(--sage-soft); }
.caret.leaf { cursor: default; visibility: hidden; }
.t-key { color: var(--key); }
.t-str { color: var(--str); }
.t-num { color: var(--num); }
.t-kw { color: #7d5f8f; }
.t-punc { color: var(--ink-2); }
.t-comma { color: var(--ink-2); }
.syn {
  background: var(--syn-bg);
  border-bottom: 1px dashed var(--sage-deep);
  border-radius: 3px;
  padding: 0 2px;
}
.expanded-badge {
  font-size: 10px; color: var(--sage-deep); background: var(--sage-soft);
  border-radius: 4px; padding: 1px 6px; margin-left: 8px; font-family: inherit;
  vertical-align: 1px;
}
.path-label { color: var(--muted); font-size: 12px; margin: 6px 0 2px; }
.count { color: var(--muted); font-size: 11px; margin-left: 8px; }

/* ---- side ---- */
.side { display: flex; flex-direction: column; gap: 16px; }
.card { padding: 14px 16px; }
.card-title { font-size: 14px; margin: 0 0 10px; font-weight: 600; color: var(--ink); display: flex; align-items: baseline; gap: 8px; }
.card-sub { font-size: 11px; color: var(--muted); font-weight: 400; }

.timer-display { font-size: 34px; text-align: center; color: var(--sage-deep); padding: 8px 0 12px; letter-spacing: 2px; }
.timer-actions { display: flex; gap: 10px; justify-content: center; }

.ts-row { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding: 3px 0; }
.ts-label { color: var(--muted); font-size: 12px; flex: none; }
.ts-val { font-size: 13px; color: var(--ink); text-align: right; word-break: break-all; }
.ts-val.clickable { cursor: pointer; padding: 1px 6px; border-radius: 6px; }
.ts-val.clickable:hover { background: var(--sage-soft); }
.ts-val.copied { background: var(--syn-bg); color: var(--sage-deep); }
.ts-conv { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--border); }
.ts-sec-title { font-size: 12px; color: var(--ink-2); font-weight: 600; margin-bottom: 6px; }
.ts-conv-input { display: flex; gap: 8px; margin-bottom: 6px; }
#tsInput, #tsPick, .ts-conv-input input {
  flex: 1; min-width: 0; padding: 7px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--surface-2); font-family: var(--mono); font-size: 13px; outline: none;
  color: var(--ink);
}
#tsInput:focus, #tsPick:focus, .ts-conv-input input:focus { border-color: var(--sage); box-shadow: 0 0 0 3px var(--sage-soft); }

.sf-params { display: flex; gap: 8px; margin-bottom: 8px; }
.sf-note { font-size: 11px; color: var(--muted); text-align: center; margin-bottom: 4px; }
.sf-param { flex: 1; display: flex; flex-direction: column; gap: 3px; font-size: 11px; color: var(--muted); }
.sf-param input {
  width: 100%; padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--surface-2); font-family: var(--mono); font-size: 12px; outline: none; color: var(--ink);
}
.sf-param input:focus { border-color: var(--sage); }
.sf-list { margin-top: 8px; display: flex; flex-direction: column; gap: 4px; }
.sf-id {
  font-family: var(--mono); font-size: 13px; color: var(--sage-deep);
  padding: 3px 8px; border-radius: 6px; cursor: pointer; text-align: center; word-break: break-all;
}
.sf-id:hover { background: var(--sage-soft); }
.sf-id.copied { background: var(--syn-bg); }

.stats { list-style: none; margin: 0; padding: 0; }
.stats li { display: flex; justify-content: space-between; padding: 5px 0; border-bottom: 1px dashed var(--border); }
.stats li:last-child { border-bottom: none; }
.stat-label { color: var(--ink-2); }
.stat-value { color: var(--sage-deep); font-weight: 600; }

.history-card { flex: 1; display: flex; flex-direction: column; min-height: 220px; }
.history-list { flex: 1; overflow-y: auto; max-height: 420px; }
.hist-item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px; border-radius: 8px; cursor: default;
}
.hist-item:hover { background: var(--surface-2); }
.hist-item.selected { background: var(--sage-soft); }
.hist-item input { accent-color: var(--sage-deep); flex: none; }
.hist-main { flex: 1; min-width: 0; cursor: pointer; }
.hist-label {
  display: block; font-family: var(--mono); font-size: 12px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--ink);
}
.hist-time { font-size: 11px; color: var(--muted); }
.hist-del { border: none; background: none; color: var(--muted); cursor: pointer; font-size: 14px; padding: 2px 6px; border-radius: 6px; flex: none; }
.hist-del:hover { color: #b4553f; background: var(--diff-del); }
.history-empty { color: var(--muted); font-size: 12px; text-align: center; padding: 18px 0; }
.history-actions { display: flex; gap: 10px; margin-top: 10px; }

/* ---- diff modal ---- */
.modal {
  position: fixed; inset: 0; background: rgba(46, 53, 49, 0.45);
  display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 50;
}
.modal[hidden] { display: none; }
.modal-panel {
  background: var(--surface); border-radius: 14px; width: min(1080px, 100%);
  max-height: 88vh; display: flex; flex-direction: column; padding: 18px 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .25);
}
.modal-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.modal-head h2 { font-size: 15px; margin: 0; }
.modal-legend { flex: 1; display: flex; gap: 14px; font-size: 12px; color: var(--ink-2); align-items: center; }
.modal-legend span { display: inline-flex; align-items: center; gap: 5px; }
.diff-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 10px 0 6px; }
.diff-label {
  font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; font-family: var(--mono);
}
.diff-body { overflow: auto; border: 1px solid var(--border); border-radius: 8px; font-family: var(--mono); font-size: 12px; }
.diff-row { display: grid; grid-template-columns: 44px 1fr 44px 1fr; }
.diff-row > div { padding: 1px 8px; white-space: pre-wrap; word-break: break-all; }
.diff-row .ln { color: var(--muted); text-align: right; user-select: none; background: var(--surface-2); }
.diff-row.same .rc { border-left: 1px solid var(--border); }
.diff-row.del .lc { background: var(--diff-del); }
.diff-row.add .rc { background: var(--diff-add); border-left: 1px solid var(--border); }
.diff-row.del .lc + .ln, .diff-row.add .ln { opacity: .5; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; padding: 8px 14px 30px; }
  .topbar { padding: 14px 16px 6px; }
  .side { flex-direction: column; }
  .diff-body { font-size: 11px; }
}