:root {
  --navy: #1a2b4a;
  --navy-dark: #101c33;
  --accent: #2f7de1;
  --accent-light: #eaf2fd;
  --bg: #f4f6f9;
  --border: #e1e5ea;
  --text: #1f2937;
  --muted: #6b7280;
  --success: #1e7e42;
  --success-bg: #e6f4ea;
  --danger: #c0392b;
  --danger-bg: #fbe4e1;
  --warning-bg: #fdf1d6;
  --warning: #8a6100;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-decoration: none; }
h1, h2, h3, h4 { margin: 0 0 .5em; color: var(--navy); }

.login-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--navy); }
.login-card { background: #fff; border-radius: 12px; padding: 40px; width: 100%; max-width: 380px; box-shadow: 0 10px 40px rgba(0,0,0,.2); }
.login-card h2 { text-align: center; }
.login-card p.subtitle { text-align: center; color: var(--muted); margin-top: -8px; margin-bottom: 24px; font-size: 13px; }

.form-field { margin-bottom: 14px; }
.form-field label { display: block; font-size: 13px; margin-bottom: 4px; color: var(--muted); }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-family: inherit; background: #fff;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { outline: none; border-color: var(--accent); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }

.btn { display: inline-block; padding: 10px 18px; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent); color: #fff; font-size: 14px; font-weight: 600; cursor: pointer; text-align: center; }
.btn:hover { background: #2569c4; }
.btn:disabled { opacity: .6; cursor: default; }
.btn-block { display: block; width: 100%; }
.btn-outline { background: transparent; color: var(--accent); }
.btn-outline:hover { background: var(--accent-light); }
.btn-secondary { background: var(--navy); border-color: var(--navy); }
.btn-secondary:hover { background: var(--navy-dark); }
.btn-danger { background: var(--danger); border-color: var(--danger); }

.alert { padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 14px; }
.alert-error { background: var(--danger-bg); color: var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); }

.app-shell { display: flex; min-height: 100vh; }
.sidebar { width: 230px; flex: 0 0 230px; background: var(--navy); color: #fff; padding: 20px 0; }
.sidebar .brand { padding: 0 20px 20px; font-size: 18px; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,.1); margin-bottom: 10px; }
.sidebar a { display: block; padding: 11px 20px; color: rgba(255,255,255,.85); font-size: 14px; border-left: 3px solid transparent; cursor: pointer; }
.sidebar a:hover { background: rgba(255,255,255,.06); }
.sidebar a.active { border-left-color: var(--accent); background: rgba(255,255,255,.08); color: #fff; font-weight: 600; }
.sidebar .logout { margin-top: 20px; color: #ffb4b4; }

.main { flex: 1; padding: 28px 32px; min-width: 0; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.topbar .who { color: var(--muted); font-size: 13px; }

.panel { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 22px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.stat-card .num { font-size: 26px; font-weight: 700; color: var(--navy); }
.stat-card .label { font-size: 12px; color: var(--muted); margin-top: 4px; }
.stat-card.positive .num { color: var(--success); }
.stat-card.negative .num { color: var(--danger); }

table.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
table.data-table th, table.data-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.data-table th { color: var(--muted); font-weight: 600; background: #fafbfc; }
table.data-table td.num, table.data-table th.num { text-align: right; }
.table-wrap { overflow-x: auto; }

.pill { font-size: 11px; padding: 3px 9px; border-radius: 10px; font-weight: 700; text-transform: capitalize; display: inline-block; }
.pill-pending { background: var(--warning-bg); color: var(--warning); }
.pill-done { background: var(--success-bg); color: var(--success); }
.pill-draft { background: #eee; color: var(--muted); }
.pill-sent { background: #e0e9fb; color: #1a4fa0; }
.pill-paid { background: var(--success-bg); color: var(--success); }
.pill-bank { background: var(--accent-light); color: var(--accent); }
.pill-cash { background: var(--warning-bg); color: var(--warning); }
.pill-customer_receipt { background: var(--success-bg); color: var(--success); }
.pill-customer_payment { background: var(--danger-bg); color: var(--danger); }
.pill-supplier_receipt { background: var(--accent-light); color: var(--accent); }
.pill-supplier_payment { background: #eee; color: var(--navy); }

.icon-btn { border: none; background: none; cursor: pointer; font-size: 12px; padding: 4px 8px; border-radius: 4px; color: var(--accent); }
.icon-btn.delete { color: var(--danger); }

.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px; }
.modal-backdrop.open { display: flex; }
.modal { background: #fff; border-radius: 10px; padding: 26px; max-width: 600px; width: 100%; max-height: 90vh; overflow-y: auto; }
.modal h3 { margin-bottom: 16px; }

.empty-state { text-align: center; padding: 30px; color: var(--muted); font-size: 13px; }
.margin-positive { color: var(--success); font-weight: 600; }
.margin-negative { color: var(--danger); font-weight: 600; }

@media (max-width: 800px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; flex: none; display: flex; overflow-x: auto; padding: 10px 0; }
  .sidebar .brand, .sidebar .logout { display: none; }
  .sidebar a { white-space: nowrap; border-left: none; border-bottom: 3px solid transparent; }
  .sidebar a.active { border-left-color: transparent; border-bottom-color: var(--accent); }
  .main { padding: 18px; }
  .form-grid { grid-template-columns: 1fr; }
}