:root {
  --ink: #1c2430;
  --paper: #f6f4ef;
  --card: #ffffff;
  --primary: #0f6e5c;
  --primary-dark: #0a4c3f;
  --accent: #c8863a;
  --danger: #b3432b;
  --line: #e4e0d6;
  --debt-color: #b3432b;
  --credit-color: #0f6e5c;
  --muted: #6b7280;
}

* { box-sizing: border-box; }

body {
  font-family: 'Cairo', 'Segoe UI', Tahoma, sans-serif;
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-navbar {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: .7rem 0;
  box-shadow: 0 2px 10px rgba(0,0,0,.15);
}
.app-navbar .navbar-brand {
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
}
.brand-icon { margin-left: .3rem; }
.app-navbar .nav-link {
  color: rgba(255,255,255,.82);
  font-weight: 600;
  border-radius: 8px;
  padding: .45rem .9rem !important;
  transition: background .15s ease, color .15s ease;
}
.app-navbar .nav-link:hover { color: #fff; background: rgba(255,255,255,.12); }
.app-navbar .nav-link.active { color: #fff; background: rgba(255,255,255,.22); }

.app-main {
  flex: 1;
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
  padding: 1.8rem 1rem 3rem;
}

.app-footer {
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: var(--card);
}

.card-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 1px 3px rgba(20,20,20,.05);
  padding: 1.4rem;
  margin-bottom: 1.4rem;
}

.page-title {
  font-weight: 800;
  font-size: 1.5rem;
  margin-bottom: .2rem;
  color: var(--primary-dark);
}
.page-sub { color: var(--muted); margin-bottom: 1.2rem; }

.stat-tile {
  border-radius: 14px;
  padding: 1.1rem 1.3rem;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.stat-tile h3 { font-size: 1.6rem; font-weight: 800; margin: 0; }
.stat-tile span.label { font-weight: 600; opacity: .9; font-size: .92rem; }
.stat-tile.tile-debt { background: linear-gradient(135deg,#b3432b,#8a3120); }
.stat-tile.tile-payments { background: linear-gradient(135deg,#0f6e5c,#0a4c3f); }
.stat-tile.tile-sales { background: linear-gradient(135deg,#c8863a,#a8692a); }
.stat-tile.tile-purchases { background: linear-gradient(135deg,#3a5a8c,#2b4266); }

.table-app {
  --bs-table-bg: transparent;
}
.table-app thead th {
  background: #eef2ee;
  font-weight: 700;
  color: var(--primary-dark);
  border-bottom: none;
  white-space: nowrap;
}
.table-app td, .table-app th { vertical-align: middle; padding: .65rem .75rem; }

.badge-purchase { background: #3a5a8c; }
.badge-payment { background: var(--primary); }
.badge-opening { background: var(--accent); }

.balance-positive { color: var(--debt-color); font-weight: 700; }
.balance-zero { color: var(--muted); font-weight: 700; }

.btn-app-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}
.btn-app-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }

.day-status-open {
  background: #e7f4ef;
  border: 1px solid #b9dfd0;
  color: var(--primary-dark);
  border-radius: 10px;
  padding: .55rem 1rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.day-status-closed {
  background: #f7ece7;
  border: 1px solid #e3c3b6;
  color: var(--danger);
  border-radius: 10px;
  padding: .55rem 1rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

.merchant-row-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .9rem 1rem;
  margin-bottom: .8rem;
  background: #fdfcfa;
}
.merchant-row-card .m-name { font-weight: 700; font-size: 1.05rem; }
.merchant-row-card .m-balance { font-weight: 800; }

.form-label { font-weight: 600; font-size: .9rem; }

.empty-hint {
  text-align: center;
  color: var(--muted);
  padding: 2.2rem 1rem;
}

@media print {
  .app-navbar, .app-footer, .no-print { display: none !important; }
  body { background: #fff; }
  .app-main { max-width: 100%; padding: 0; }
  .card-panel { box-shadow: none; border: 1px solid #ccc; }
}