:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #1e293b;
  --muted: #64748b;
  --danger: #dc2626;
  --success: #16a34a;
}
* { box-sizing: border-box; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
}
[dir="rtl"] body { font-family: 'Tahoma', 'Segoe UI', system-ui, sans-serif; }

a { color: var(--primary); text-decoration: none; }
.container { max-width: 1000px; margin: 0 auto; padding: 20px; }
.auth-container { max-width: 420px; margin: 60px auto; padding: 20px; }

.navbar {
  background: var(--card); border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px; flex-wrap: wrap; gap: 10px;
}
.navbar .brand { font-weight: 700; font-size: 18px; color: var(--primary); }
.navbar nav a { margin: 0 10px; color: var(--text); font-weight: 500; }
.navbar nav a:hover { color: var(--primary); }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 24px; margin-bottom: 20px;
}
.card h2, .card h3 { margin-top: 0; }

.grid-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 18px; text-align: center; }
.stat .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat .label { color: var(--muted); font-size: 13px; margin-top: 4px; }

.btn {
  display: inline-block; background: var(--primary); color: white; border: none;
  padding: 10px 18px; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 600;
}
.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn.danger { background: var(--danger); }
.btn.small { padding: 6px 12px; font-size: 13px; }

label { display: block; margin: 12px 0 6px; font-weight: 600; font-size: 14px; }
input, select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: inherit; background: white;
}
textarea { min-height: 70px; }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
[dir="rtl"] th, [dir="rtl"] td { text-align: right; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge.paid { background: #dcfce7; color: var(--success); }
.badge.unpaid { background: #fee2e2; color: var(--danger); }
.badge.draft { background: #f1f5f9; color: var(--muted); }
.badge.sent { background: #dbeafe; color: var(--primary); }
.badge.partial { background: #fef3c7; color: #b45309; }
.badge.void { background: #f1f5f9; color: #94a3b8; text-decoration: line-through; }

.error { background: #fee2e2; color: var(--danger); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.success { background: #dcfce7; color: var(--success); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.muted { color: var(--muted); font-size: 13px; }

.item-row { display: grid; grid-template-columns: 3fr 1fr 1fr auto; gap: 10px; margin-bottom: 10px; align-items: center; }
.item-row input { width: 100%; }
.flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.top-links { margin-bottom: 16px; }