:root {
  --navy: #0f172a;
  --navy-2: #1e293b;
  --emerald: #059669;
  --emerald-2: #047857;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f8fafc;
  --surface: #ffffff;
  --danger: #dc2626;
  --warn: #b45309;
  --ok: #047857;
  --shadow: 0 1px 2px rgba(15,23,42,.06), 0 4px 10px rgba(15,23,42,.05);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px; line-height: 1.5; }
a { color: var(--emerald-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.main { padding: 20px 16px 60px; }

.topbar { background: var(--navy); color: #fff; box-shadow: var(--shadow); }
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; padding: 12px 16px; gap: 12px; }
.brand { color: #fff; display: inline-flex; align-items: center; gap: 10px; font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-mark { background: var(--emerald); color: #fff; font-weight: 700; padding: 4px 8px; border-radius: 6px; letter-spacing: .5px; }
.brand-text { font-size: 15px; }
.nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.nav a { color: #cbd5e1; }
.nav a:hover { color: #fff; text-decoration: none; }
.nav a.muted { color: #94a3b8; }

.footer { margin-top: 30px; padding: 16px; color: var(--muted); text-align: center; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); padding: 18px; margin-bottom: 18px; }
.card h2, .card h1 { margin: 0 0 14px; }

.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > * { flex: 1 1 220px; min-width: 0; }

label { display: block; font-size: 13px; font-weight: 500; color: var(--navy-2); margin-bottom: 4px; }
input[type=text], input[type=password], input[type=number], input[type=date], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid #cbd5e1; border-radius: 7px; font-size: 15px; background: #fff; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--emerald); box-shadow: 0 0 0 3px rgba(5,150,105,.15); }

.btn { display: inline-block; padding: 9px 16px; border-radius: 7px; border: 1px solid transparent; font-size: 14px; font-weight: 500; cursor: pointer; text-decoration: none; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--emerald); color: #fff; }
.btn-primary:hover { background: var(--emerald-2); }
.btn-secondary { background: #fff; color: var(--navy-2); border-color: #cbd5e1; }
.btn-secondary:hover { background: #f1f5f9; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 6px 10px; font-size: 13px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; border: 1px solid; font-size: 14px; }
.flash-ok { background: #ecfdf5; border-color: #a7f3d0; color: var(--ok); }
.flash-err { background: #fef2f2; border-color: #fecaca; color: var(--danger); }
.flash-info { background: #eff6ff; border-color: #bfdbfe; color: #1d4ed8; }

.page-head { display: flex; align-items: center; justify-content: space-between; margin: 0 0 14px; flex-wrap: wrap; gap: 10px; }
.page-head h1 { margin: 0; font-size: 20px; }

table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th, table.data td { padding: 10px 10px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data th { background: #f1f5f9; color: var(--navy-2); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
table.data tr:hover td { background: #f8fafc; }
.table-wrap { overflow-x: auto; }

.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 500; }
.tag-buyer { background: #ecfeff; color: #0e7490; border: 1px solid #a5f3fc; }
.tag-seller { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

.money-pos { color: var(--ok); font-variant-numeric: tabular-nums; }
.money-neg { color: var(--danger); font-variant-numeric: tabular-nums; }
.mono { font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }

.aging-overdue { color: var(--danger); font-weight: 600; }
.aging-due-soon { color: var(--warn); font-weight: 600; }
.aging-ok { color: var(--muted); }

.login-wrap { max-width: 360px; margin: 60px auto 0; }
.login-wrap .card { padding: 26px; }
.login-wrap h1 { text-align: center; margin: 0 0 18px; font-size: 20px; }

.actions { display: flex; gap: 6px; }
form.inline { display: inline; }

@media (max-width: 640px) {
  .nav { width: 100%; justify-content: flex-start; }
  .page-head { flex-direction: column; align-items: flex-start; }
  table.data th, table.data td { padding: 8px 6px; font-size: 13px; }
}