:root {
  --bg: #f4f6f8; --card: #fff; --text: #1d2733; --muted: #6b7785; --line: #e3e8ee;
  --brand: #0f766e; --brand-2: #115e59; --brand-soft: #e6f4f2;
  --red: #c0392b; --red-soft: #fdecea; --amber: #b7791f; --amber-soft: #fdf6e3;
  --green: #1e8449; --green-soft: #e8f6ee; --blue: #2563eb; --blue-soft: #eaf1fe;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--brand); text-decoration: none; }
h1 { font-size: 20px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 0 0 12px; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.right { text-align: right; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Layout */
.shell { display: flex; min-height: 100vh; }
.side { width: 220px; background: #0b3b37; color: #cfe7e3; padding: 16px 0; flex-shrink: 0; }
.side .brand { color: #fff; font-weight: 700; font-size: 16px; padding: 0 20px 16px; }
.side a { display: block; padding: 10px 20px; color: #cfe7e3; }
.side a.active, .side a:hover { background: rgba(255,255,255,.08); color: #fff; }
.side .who { padding: 16px 20px; font-size: 12px; color: #9cc4be; border-top: 1px solid rgba(255,255,255,.1); margin-top: 16px; }
.main { flex: 1; padding: 24px; min-width: 0; max-width: 1200px; }
.topbar { display: none; }
.show-sm { display: none; }

@media (max-width: 800px) {
  .shell { display: block; }
  .side { position: fixed; inset: 0 auto 0 0; z-index: 50; transform: translateX(-100%); transition: transform .2s; }
  .side.open { transform: none; }
  .topbar { display: flex; align-items: center; gap: 12px; background: #0b3b37; color: #fff; padding: 12px 16px; position: sticky; top: 0; z-index: 40; }
  .topbar button { background: none; border: 0; color: #fff; font-size: 22px; padding: 0; }
  .main { padding: 16px; }
  .hide-sm { display: none; }
  .show-sm { display: block; }
  .stat .value { font-size: 17px; }
}

/* Cards / grids */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; }
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.stat .label { font-size: 12px; color: var(--muted); }
.stat .value { font-size: 20px; font-weight: 700; margin-top: 4px; font-variant-numeric: tabular-nums; }
.stat.warn .value { color: var(--red); }
.stat.good .value { color: var(--green); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .grid2 { grid-template-columns: 1fr; } }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spread { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-weight: 500; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
th { font-size: 12px; color: var(--muted); font-weight: 600; background: #fafbfc; }
tr.click { cursor: pointer; }
tr.click:hover td { background: #f7fafa; }
tfoot td { font-weight: 700; }

/* Forms */
label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
input, select, textarea { width: 100%; padding: 9px 10px; border: 1px solid #cdd5de; border-radius: 8px; font: inherit; background: #fff; color: var(--text); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }
.field { margin-bottom: 12px; }
.fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0 12px; }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--text); }
.check input { width: auto; }
.seg { display: inline-flex; border: 1px solid #cdd5de; border-radius: 8px; overflow: hidden; max-width: 100%; }
.seg button { border: 0; border-radius: 0; background: #fff; color: var(--text); padding: 8px 12px; white-space: nowrap; flex: 1 1 auto; justify-content: center; }
.seg button + button { border-left: 1px solid #cdd5de; }
.seg button.on { background: var(--brand); color: #fff; }
.seg button:disabled { color: #b5bec8; background: #f5f7f9; cursor: not-allowed; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

button, .btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 14px; border-radius: 8px; border: 1px solid transparent;
  background: var(--brand); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:hover, .btn:hover { background: var(--brand-2); }
button.secondary, .btn.secondary { background: #fff; color: var(--text); border-color: #cdd5de; }
button.secondary:hover { background: #f2f4f7; }
button.danger { background: var(--red); }
button.small { padding: 5px 10px; font-size: 12px; }
button:disabled { opacity: .6; cursor: not-allowed; }

/* Badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; text-transform: capitalize; }
.b-active, .b-upcoming { background: var(--blue-soft); color: var(--blue); }
.b-paid { background: var(--green-soft); color: var(--green); }
.b-overdue { background: var(--red-soft); color: var(--red); }
.b-due, .b-partial { background: var(--amber-soft); color: var(--amber); }
.b-cancelled, .b-voided { background: #eef0f3; color: var(--muted); }
.b-payoff { background: var(--brand-soft); color: var(--brand); }
.b-waiver { background: var(--amber-soft); color: var(--amber); }

/* Modal & toast */
.modal-bg { position: fixed; inset: 0; background: rgba(15,23,32,.45); display: flex; align-items: flex-start; justify-content: center; z-index: 100; padding: 40px 16px; overflow-y: auto; }
.modal { background: #fff; border-radius: 12px; width: 100%; max-width: 520px; padding: 20px; }
.modal .actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #1d2733; color: #fff; padding: 10px 18px; border-radius: 8px; z-index: 200; }
.toast.err { background: var(--red); }
.callout { background: var(--brand-soft); border-radius: 8px; padding: 12px; margin: 12px 0; }
.callout.warn { background: var(--amber-soft); }

/* Auth */
.auth { max-width: 380px; margin: 10vh auto; }

/* Print */
.print-only { display: none; }
@media print {
  .side, .topbar, .no-print, button { display: none !important; }
  .main { padding: 0; max-width: none; }
  .card { border: 0; padding: 0; }
  .print-only { display: block; }
  body { background: #fff; }
}