:root{--bg:#f4f5f7;--card:#fff;--ink:#1d2330;--muted:#6b7385;--line:#e3e6ec;--acc:#2456d6;--acc-soft:#e8eefc;--l:#1f8a5b;--r:#b8542a;--err:#c0352b;--ok:#1f8a5b;--warn:#a86b00;--side:#1b2130;--side-ink:#c9cfdb}
@media (prefers-color-scheme:dark){:root{--bg:#121519;--card:#1c2027;--ink:#e7e9ee;--muted:#9097a5;--line:#2c313b;--acc:#6f95ff;--acc-soft:#232c44;--l:#4cc38a;--r:#f08a5d;--err:#ff7a6e;--ok:#4cc38a;--warn:#e0a640;--side:#0d1014;--side-ink:#aab1bf}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 system-ui,-apple-system,"Noto Sans TC","PingFang TC",sans-serif}
a{color:var(--acc)}
h1{font-size:20px;margin:0}h2{font-size:15px;margin:22px 0 8px}h3{font-size:14px;margin:12px 0 6px}
code{font-size:12px;word-break:break-all}
.narrow{max-width:420px;margin:8vh auto;padding:0 16px}

/* layout */
.shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.side{background:var(--side);color:var(--side-ink);padding:16px 10px;position:sticky;top:0;height:100vh;overflow-y:auto}
.side .brand{font-weight:600;color:#fff;padding:4px 10px 14px;font-size:15px}
.side .group{font-size:11px;letter-spacing:.06em;text-transform:uppercase;opacity:.6;padding:12px 10px 4px}
.side button{display:block;width:100%;text-align:left;background:none;border:0;color:inherit;padding:7px 10px;border-radius:6px;font:inherit;cursor:pointer}
.side button:hover{background:rgba(255,255,255,.06)}.side button.on{background:var(--acc);color:#fff}
.main{padding:18px 22px 60px;min-width:0}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.menu-btn{display:none}
@media (max-width:820px){.shell{grid-template-columns:1fr}.side{position:fixed;inset:0 30% 0 0;z-index:20;transform:translateX(-100%);transition:transform .2s}
  .side.open{transform:none}.menu-btn{display:inline-block}.main{padding:14px 16px 60px}}

/* components */
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px}
.stack{display:flex;flex-direction:column;gap:10px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}
.stat .k{font-size:12px;color:var(--muted);display:block}.stat .v{font-size:21px;font-weight:600;font-variant-numeric:tabular-nums}
.k{color:var(--muted);font-size:13px}
label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}
label.chk{flex-direction:row;align-items:center;gap:6px;color:var(--ink)}
input,select,textarea,button{font:inherit;padding:7px 10px;border-radius:6px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
textarea{min-height:110px;resize:vertical}
input[type=checkbox]{width:auto;padding:0}
button{background:var(--acc);color:#fff;border:0;cursor:pointer;white-space:nowrap}
button.ghost{background:transparent;color:var(--acc);border:1px solid var(--acc)}
button.danger{background:var(--err)}button.sm{padding:3px 8px;font-size:13px}
button:disabled{opacity:.5;cursor:default}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.form{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px 14px}
.form .full{grid-column:1/-1}
.L{color:var(--l)}.R{color:var(--r)}.err{color:var(--err)}.okc{color:var(--ok)}
.badge{display:inline-block;padding:1px 8px;border-radius:99px;font-size:12px;background:var(--acc-soft);color:var(--acc)}
.badge.active,.badge.paid,.badge.approved,.badge.matched,.badge.done,.badge.credited{background:rgba(31,138,91,.12);color:var(--ok)}
.badge.pending,.badge.running,.badge.ambiguous,.badge.amount_mismatch{background:rgba(168,107,0,.12);color:var(--warn)}
.badge.suspended,.badge.rejected,.badge.failed,.badge.cancelled,.badge.refunded,.badge.reversed,.badge.unmatched{background:rgba(192,53,43,.12);color:var(--err)}
.scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-weight:500;white-space:nowrap}
tr.click{cursor:pointer}tr.click:hover td{background:var(--acc-soft)}
.pager{display:flex;gap:8px;align-items:center;justify-content:flex-end;margin-top:8px}
.ann{border-left:3px solid var(--acc);padding:8px 12px;background:var(--card);border-radius:6px;margin-bottom:8px}
.ann .body{white-space:pre-wrap;font-size:14px;margin-top:4px}
.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden}.progress>i{display:block;height:100%;background:var(--acc)}
dialog{border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--ink);padding:0;width:min(760px,94vw);max-height:90vh}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog .hd{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line)}
dialog .bd{padding:16px;overflow-y:auto;max-height:calc(90vh - 56px)}
.toast{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:8px;z-index:99;font-size:14px}
.chart svg{width:100%;height:auto;display:block}.chart text{fill:var(--muted);font-size:10px}

/* binary tree */
.tree{overflow-x:auto;padding:8px 0}.tree ul{display:flex;justify-content:center;padding:14px 0 0;margin:0;list-style:none}
.tree li{flex:1;text-align:center;padding:14px 4px 0;position:relative;min-width:118px}
.tree li::before{content:"";position:absolute;top:0;left:50%;height:14px;border-left:1px solid var(--line)}
.node{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-size:12px;cursor:pointer;min-width:100px}
.node.pending{border-style:dashed;opacity:.75}.node.suspended{opacity:.5}.node.empty{color:var(--muted);cursor:default;border-style:dotted}
.node b{display:block;font-size:13px}