:root {
  --bg: #f5f6f8; --card: #ffffff; --text: #1d2330; --muted: #667085; --line: #e3e6eb;
  --brand: #1f4e78; --brand-2: #2b6cb0; --ok: #1e7b46; --ok-bg: #e3f4ea; --warn: #a15c00; --warn-bg: #fdf0dc;
  --bad: #b42318; --bad-bg: #fde8e7; --grey-bg: #eef0f3; --shadow: 0 1px 2px rgba(16, 24, 40, .06);
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --card: #1b2029; --text: #e6e9ef; --muted: #98a2b3; --line: #2b313c;
    --brand: #7fb3e6; --brand-2: #9cc6ef; --ok: #6fd39b; --ok-bg: #173325; --warn: #f2b25c; --warn-bg: #3a2c15;
    --bad: #f78a80; --bad-bg: #3d1d1b; --grey-bg: #262c36; --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; background: var(--bg); color: var(--text); }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--brand-2); }

header.top { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
header.top h1 { font-size: 17px; margin: 0; flex: 1; }
header.top .user { color: var(--muted); font-size: 13px; }
main { max-width: 1280px; margin: 0 auto; padding: 16px; }

.btn { border: 1px solid var(--line); background: var(--card); color: var(--text); text-decoration: none; padding: 7px 12px; border-radius: 8px; cursor: pointer; white-space: nowrap; }
.btn:hover { border-color: var(--brand-2); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn.danger { color: var(--bad); }
.btn.small { padding: 3px 8px; font-size: 12px; }
.btn:disabled { opacity: .5; cursor: default; }
@media (prefers-color-scheme: dark) { .btn.primary, .btn.ok { color: #10141a; } }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow); }
.card .lbl { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
.card .val { font-size: 22px; font-weight: 650; margin-top: 2px; font-variant-numeric: tabular-nums; }
.card .sub { color: var(--muted); font-size: 12px; }

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; align-items: center; }
.filters input, .filters select { padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.filters input[type=search] { flex: 1; min-width: 200px; }
.count { color: var(--muted); margin-left: auto; }

.table-wrap { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: auto; box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { font-size: 12px; color: var(--muted); font-weight: 600; background: var(--card); position: sticky; top: 0; cursor: pointer; user-select: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--grey-bg); }
.muted { color: var(--muted); }

.pill { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.pill.Paid { background: var(--ok-bg); color: var(--ok); }
.pill.Partial { background: var(--warn-bg); color: var(--warn); }
.pill.Unpaid { background: var(--bad-bg); color: var(--bad); }
.pill.Waived { background: var(--grey-bg); color: var(--muted); }

/* side panel */
.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.35); display: none; z-index: 10; }
.overlay.open { display: block; }
.panel { position: fixed; top: 0; right: 0; bottom: 0; width: min(520px, 100%); background: var(--card); z-index: 11; transform: translateX(100%); transition: transform .18s ease; display: flex; flex-direction: column; }
.panel.open { transform: none; }
.panel .head { padding: 14px 16px; border-bottom: 1px solid var(--line); display: flex; gap: 10px; align-items: start; }
.panel .head h2 { margin: 0; font-size: 17px; flex: 1; }
.panel .body { padding: 16px; overflow: auto; flex: 1; }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 4px 10px; margin-bottom: 14px; }
.kv div:nth-child(odd) { color: var(--muted); }
.money-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 16px; }
.money-row .card .val { font-size: 18px; }
h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); margin: 18px 0 8px; }
form.pay { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
form.pay label { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--muted); }
form.pay input, form.pay select, textarea { padding: 7px 9px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); }
form.pay .full { grid-column: 1 / -1; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; grid-column: 1 / -1; }
.list { border: 1px solid var(--line); border-radius: 8px; }
.list .item { display: flex; gap: 10px; padding: 8px 10px; border-bottom: 1px solid var(--line); align-items: center; }
.list .item:last-child { border-bottom: 0; }
.list .item .grow { flex: 1; }
.err { color: var(--bad); min-height: 1.2em; margin: 6px 0; }
.toast { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 8px 14px; border-radius: 8px; opacity: 0; transition: opacity .2s; z-index: 20; pointer-events: none; }
.toast.show { opacity: 1; }

/* login */
.login { max-width: 360px; margin: 12vh auto; padding: 0 16px; }
.login .card { padding: 22px; }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.login label { display: block; margin: 12px 0 4px; color: var(--muted); font-size: 13px; }
.login input { width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
.login .btn { width: 100%; margin-top: 16px; padding: 10px; }

@media (max-width: 720px) {
  main { padding: 12px; }
  .hide-sm, header.top .user { display: none; }
  header.top h1 { font-size: 15px; }
  .cards { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .card .val { font-size: 18px; }
  th, td { white-space: normal; padding: 8px 6px; }
  .money-row { grid-template-columns: 1fr 1fr 1fr; }
  .kv { grid-template-columns: 110px 1fr; }
  form.pay { grid-template-columns: 1fr; }
}