:root {
  --bg: #f4f6f9; --card: #fff; --text: #1d2433; --muted: #6b7587; --line: #e3e7ee;
  --primary: #2563eb; --primary-d: #1d4ed8; --green: #15803d; --red: #c2263b; --amber: #b45309;
  --green-bg: #e8f6ee; --red-bg: #fdeaed; --blue-bg: #e8f0fe;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161d; --card: #1b212b; --text: #e8ecf3; --muted: #94a0b4; --line: #2b3342;
    --primary: #5b8def; --primary-d: #7aa2f5; --green: #4cc38a; --red: #f0707f; --amber: #e0a050;
    --green-bg: #15301f; --red-bg: #361a20; --blue-bg: #1b2a4a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 system-ui, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
a { color: var(--primary); text-decoration: none; }

.top { background: var(--card); border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 24px; padding: 0 20px; flex-wrap: wrap; position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 700; font-size: 18px; padding: 14px 0; }
nav { display: flex; gap: 4px; flex-wrap: wrap; }
nav a { color: var(--muted); padding: 16px 12px; border-bottom: 3px solid transparent; font-weight: 500; }
nav a.logout { margin-left: 12px; color: var(--red); }
@media (min-width: 761px) { .top { padding-right: 20px; } nav { flex: 1; } nav a.logout { margin-left: auto; } }
nav a.active { color: var(--primary); border-color: var(--primary); }
main { max-width: 980px; margin: 0 auto; padding: 20px 16px 60px; }

h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 0 0 10px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 16px; }
.cards .card { margin: 0; }
.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { font-size: 22px; font-weight: 700; margin-top: 2px; }
.pos { color: var(--green); } .neg { color: var(--red); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .two { grid-template-columns: 1fr; } }

button, .btn { font: inherit; border: 1px solid var(--line); background: var(--card); color: var(--text); padding: 8px 14px; border-radius: 8px; cursor: pointer; display: inline-block; }
button:hover, .btn:hover { border-color: var(--primary); }
.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.primary:hover { background: var(--primary-d); border-color: var(--primary-d); }
.danger { color: var(--red); }
.link { border: 0; background: none; padding: 2px 6px; color: var(--primary); }
.link.danger { color: var(--red); }

input, select { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; width: 100%; }
input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
label { display: block; font-size: 13px; color: var(--muted); }
label > input, label > select { margin-top: 4px; color: var(--text); font-size: 15px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.wide { grid-column: 1 / -1; }
.check { display: flex; align-items: center; gap: 8px; }
.check input { width: auto; margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

.seg { display: flex; gap: 0; margin-top: 4px; }
.seg label { flex: 1; margin: 0; }
.seg input { position: absolute; opacity: 0; width: 0; }
.seg span { display: block; text-align: center; padding: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); cursor: pointer; font-size: 15px; }
.seg label:first-child span { border-radius: 8px 0 0 8px; }
.seg label:last-child span { border-radius: 0 8px 8px 0; border-left: 0; }
.seg input:checked + span.in { background: var(--green-bg); color: var(--green); border-color: var(--green); font-weight: 600; }
.seg input:checked + span.out { background: var(--red-bg); color: var(--red); border-color: var(--red); font-weight: 600; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
td.num, th.num { text-align: right; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 99px; background: var(--blue-bg); color: var(--primary); }
.tag.done { background: var(--green-bg); color: var(--green); }

.bar { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 8px 0 4px; }
.bar > i { display: block; height: 100%; background: var(--primary); border-radius: 99px; }
.catrow { display: grid; grid-template-columns: 130px 1fr auto; gap: 10px; align-items: center; margin: 6px 0; font-size: 14px; }
.catrow .bar { margin: 0; }
.catrow .bar > i { background: var(--red); }

.debt { display: block; color: inherit; border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 10px; background: var(--bg); }
.debt:hover { border-color: var(--primary); }
.debt.closed { opacity: .65; }
.debt .top2 { display: flex; justify-content: space-between; gap: 8px; }
.debt .rem { font-weight: 700; white-space: nowrap; }
.partyrow { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.partyrow:last-child { border: 0; }
.bigtotal { font-size: 26px; font-weight: 700; margin-bottom: 8px; }

.auth { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.auth .card { width: 100%; max-width: 380px; }
.auth h1 { text-align: center; }
.auth form { display: grid; gap: 12px; }
.err { color: var(--red); font-size: 14px; min-height: 18px; }
#toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #1d2433; color: #fff; padding: 10px 16px; border-radius: 8px; opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 20; max-width: 90vw; }
#toast.show { opacity: 1; }
#toast.error { background: var(--red); }
@media (max-width: 600px) { .hide-sm { display: none; } .top { gap: 0; padding: 0 8px; } nav a { padding: 12px 8px; } }