:root {
  color-scheme: light;
  --bg: #f4f4f2;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --muted: #52514e;
  --line: #e4e3df;
  --grid: #ecebe7;
  --accent: #2a78d6;
  --c-in: #2a78d6;   /* Thu */
  --c-out: #eb6834;  /* Chi */
  --amt-in: #1a5fb0;
  --danger: #c62828;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111110;
    --surface: #1a1a19;
    --ink: #f0efec;
    --muted: #c3c2b7;
    --line: #2e2e2c;
    --grid: #262624;
    --accent: #3987e5;
    --c-in: #3987e5;
    --c-out: #d95926;
    --amt-in: #6da7ec;
    --danger: #ef5350;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111110; --surface: #1a1a19; --ink: #f0efec; --muted: #c3c2b7; --line: #2e2e2c; --grid: #262624;
  --accent: #3987e5; --c-in: #3987e5; --c-out: #d95926; --amt-in: #6da7ec; --danger: #ef5350;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--accent); text-decoration: none; }
h1 { font-size: 24px; margin: 24px 0 16px; }
h2 { font-size: 16px; margin: 20px 0 10px; display: flex; align-items: center; gap: 8px; }
.card h2 { margin-top: 0; }
code { font-size: 13px; background: var(--bg); padding: 2px 6px; border-radius: 4px; word-break: break-all; }
small { display: block; color: var(--muted); font-size: 12px; }
.muted { color: var(--muted); }
.err { color: var(--danger); }

.top {
  position: sticky; top: 0; z-index: 5; background: var(--surface); border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 16px; padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
}
.brand { font-weight: 700; color: var(--ink); white-space: nowrap; }
.top nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.top nav a { color: var(--muted); padding: 6px 10px; border-radius: 8px; white-space: nowrap; }
.top nav a.on { color: var(--ink); background: var(--bg); font-weight: 600; }

main { max-width: 1040px; margin: 0 auto; padding: 16px 16px max(32px, env(safe-area-inset-bottom)); }
main.narrow { max-width: 420px; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 16px; min-width: 0; }
.card.flush { padding: 0; overflow: hidden; }
.card-h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 8px; }
.card-h h2 { margin: 0; }
.pad { padding: 16px; margin: 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid2 > .card { margin-bottom: 0; }
.grid2 { margin-bottom: 16px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }

.flash { background: var(--surface); border-left: 4px solid var(--accent); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }

.btn {
  display: inline-block; border: 1px solid var(--accent); background: var(--accent); color: #fff;
  font: inherit; font-weight: 600; padding: 8px 14px; border-radius: 8px; cursor: pointer; text-align: center;
}
.btn.ghost { background: transparent; color: var(--accent); border-color: var(--line); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.danger.ghost { background: transparent; color: var(--danger); border-color: var(--line); }

input, select, textarea {
  font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; width: 100%; min-width: 0;
  font-size: 16px; /* tránh iOS tự zoom */
}
label { display: block; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
label input, label select { margin-top: 4px; }
label.check { display: flex; gap: 8px; align-items: center; color: var(--ink); font-size: 14px; margin-bottom: 6px; }
label.check input { width: auto; margin: 0; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form input[name="learn_kw"] { margin-bottom: 12px; }

.monthbar { display: flex; gap: 8px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.monthbar form { flex: 0 1 180px; }
.monthbar .right { margin-left: auto; }

.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 760px) { .tiles { grid-template-columns: 1fr 1fr; } }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px; min-width: 0; }
.tile .lbl { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.tile b { display: block; font-size: 20px; margin: 4px 0 2px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
@media (max-width: 400px) { .tile b { font-size: 17px; } }

.dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; flex: none; }
.dot.in { background: var(--c-in); }
.dot.out { background: var(--c-out); }
.legend { display: flex; gap: 12px; font-size: 13px; color: var(--muted); }
.legend span { display: flex; align-items: center; gap: 6px; }

.chart { position: relative; height: 240px; }

.catbars { width: 100%; border-collapse: collapse; }
.catbars td { padding: 7px 0; border-top: 1px solid var(--line); vertical-align: middle; }
.catbars tr:first-child td { border-top: 0; }
.catbars .name { width: 40%; padding-right: 10px; }
.catbars .name a { color: var(--ink); }
.catbars .bar { width: 30%; }
.catbars .fill { display: block; height: 10px; border-radius: 0 4px 4px 0; }
.catbars .fill.in { background: var(--c-in); }
.catbars .fill.out { background: var(--c-out); }
.catbars .num { text-align: right; padding-left: 10px; white-space: nowrap; font-variant-numeric: tabular-nums; }

.txlist { list-style: none; margin: 0; padding: 0; }
.txlist li { border-top: 1px solid var(--line); }
.txlist li:first-child { border-top: 0; }
.txlist a { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; color: var(--ink); }
.txlist a span { min-width: 0; overflow-wrap: anywhere; }
.amt { white-space: nowrap; font-variant-numeric: tabular-nums; }
.amt.in { color: var(--amt-in); }
.txlist.big li { display: grid; grid-template-columns: 1fr; padding: 0 16px; }
.txlist.big li.day { background: var(--bg); color: var(--muted); font-size: 12px; font-weight: 600; padding: 6px 16px; }
.txlist.big .setcat { padding-bottom: 10px; }
.txlist.big .setcat select { padding: 4px 8px; font-size: 14px; width: auto; max-width: 100%; }
.txlist.big .setcat select.unset { color: var(--muted); border-style: dashed; }

.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.filters > * { flex: 1 1 140px; width: auto; }
.filters .btn { flex: 0 0 auto; }
.summary { color: var(--muted); margin: 0 0 12px; }
.summary b { color: var(--ink); }
details.add summary { cursor: pointer; font-weight: 600; color: var(--accent); }
details.add[open] summary { margin-bottom: 12px; }

.catrow { display: grid; grid-template-columns: 200px 1fr auto; gap: 10px; align-items: start; padding: 12px; margin-bottom: 8px; }
.catrow .actions { display: flex; gap: 8px; align-items: center; }
@media (max-width: 760px) {
  .catrow { grid-template-columns: 1fr; }
  .catrow .actions small { margin-right: auto; }
}
.cname { font-weight: 600; }
form.inline { margin: 0; }

.meta { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; margin: 0 0 14px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 480px) { .meta { grid-template-columns: 1fr; } .meta dd { margin-bottom: 6px; } }

.log { width: 100%; border-collapse: collapse; font-size: 13px; }
.log td { padding: 6px 8px 6px 0; border-top: 1px solid var(--line); vertical-align: top; }
.log td:first-child { white-space: nowrap; }

.pager { display: flex; gap: 6px; flex-wrap: wrap; }
.pager a { padding: 6px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.pager a.on { background: var(--accent); color: #fff; border-color: var(--accent); }
@media (max-width: 480px) { .brand { display: none; } .top { padding-left: 8px; padding-right: 8px; } .top nav a { padding: 6px 8px; } }
.mailraw { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 12px; background: var(--bg); padding: 8px; border-radius: 6px; max-height: 320px; overflow: auto; }
.log details summary { cursor: pointer; }