:root{
  --bg:#f5f6f8; --panel:#fff; --line:#e3e6ea; --ink:#1c2430; --muted:#6b7683;
  --accent:#1f6feb; --neg:#c0392b; --head:#eef1f5; --net:#e8f0fe;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#12151a;--panel:#1a1f27;--line:#2b323d;--ink:#e6eaf0;--muted:#93a0b0;
        --accent:#4d8dff;--neg:#ff6b5e;--head:#232a34;--net:#1e2a44;}
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.muted{color:var(--muted)}
.small{font-size:13px}
.err{color:var(--neg)} .ok{color:#1a8a4b}

/* auth */
.center{min-height:100vh;display:flex;align-items:center;justify-content:center}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:32px;box-shadow:0 6px 24px rgba(0,0,0,.06)}
.auth{width:360px;max-width:92vw}
.auth h1{margin:0 0 2px;font-size:22px}
.auth form{display:flex;flex-direction:column;gap:8px;margin-top:18px}
.auth label{font-size:13px;color:var(--muted)}
.auth input{padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  background:var(--bg);color:var(--ink);font-size:16px}
.auth button{margin-top:8px;padding:11px;border:0;border-radius:8px;
  background:var(--accent);color:#fff;font-size:15px;cursor:pointer}

/* chrome */
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:12px 20px;background:var(--panel);border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:5;flex-wrap:wrap}
.brand{font-weight:600}
.topbar nav{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.tab.active{font-weight:600}
main.wide{padding:20px;max-width:100%}
main.narrow{padding:24px;max-width:760px;margin:0 auto}
.toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
h1{font-size:20px;margin:6px 0}
.btn{display:inline-block;padding:7px 12px;border:1px solid var(--line);border-radius:8px;
  background:var(--panel);color:var(--ink)}
.btn.active{border-color:var(--accent);color:var(--accent)}

/* table */
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin-top:12px}
table.ddc{border-collapse:collapse;width:100%;font-size:13px;white-space:nowrap}
table.ddc th,table.ddc td{padding:7px 12px;border-bottom:1px solid var(--line)}
table.ddc thead th{position:sticky;top:0;background:var(--head);text-align:right;font-weight:600}
table.ddc thead th.rowhead{text-align:left}
.rowhead{text-align:left;position:sticky;left:0;background:var(--panel);z-index:1}
.num{text-align:right;font-variant-numeric:tabular-nums}
.neg{color:var(--neg)}
.total{font-weight:600}
tr.section th{background:var(--head);text-align:left;font-weight:700;font-size:13px}
tr.subtotal td{background:var(--head);font-weight:600}
tr.subtotal .rowhead,tr.section .rowhead{background:var(--head)}
tr.net td{background:var(--net);font-weight:700}
tr.net .rowhead{background:var(--net)}

/* lists/forms */
table.list{border-collapse:collapse;width:100%;margin-top:12px}
table.list th,table.list td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left}
.stack{display:flex;flex-direction:column;gap:8px;max-width:360px;margin-top:8px}
.stack input,.stack button{padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  background:var(--panel);color:var(--ink)}
.stack button{background:var(--accent);color:#fff;border:0;cursor:pointer}
.check{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:14px}
form.inline{display:inline}
button.link{background:none;border:0;color:var(--accent);cursor:pointer;padding:0;font-size:13px}