* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #fafafa;
  color: #1a1a1a;
  margin: 0;
}
.container { max-width: 880px; margin: 0 auto; padding: 24px 16px; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; background: #111; color: #fff;
}
.topbar a { color: #fff; text-decoration: none; margin-right: 16px; font-size: 14px; }
.topbar a.brand { font-weight: 700; font-size: 15px; }
h1 { font-size: 22px; margin-bottom: 4px; }
.subtitle { color: #666; margin-bottom: 24px; }
.card { border: 1px solid #e2e2e2; border-radius: 8px; padding: 16px; margin-bottom: 16px; background: #fff; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid #eee; font-size: 14px; }
th { color: #666; font-weight: 600; font-size: 12px; text-transform: uppercase; }
.btn {
  display: inline-block; background: #111; color: #fff; border: 0; border-radius: 6px;
  padding: 9px 14px; font-size: 14px; cursor: pointer; text-decoration: none;
}
.btn.secondary { background: transparent; color: #111; border: 1px solid #ccc; }
.btn.danger { background: #b3261e; }
input, select, textarea {
  width: 100%; padding: 9px 10px; border: 1px solid #ccc; border-radius: 6px; font-size: 14px; margin-bottom: 12px;
}
label { font-size: 13px; font-weight: 600; display: block; margin-bottom: 4px; }
.badge { font-size: 11px; padding: 2px 8px; border-radius: 20px; background: #eee; }
.badge.SENT { background: #dbeafe; color: #1d4ed8; }
.badge.PAID { background: #dcfce7; color: #15803d; }
.badge.OVERDUE { background: #fee2e2; color: #b91c1c; }
.badge.DRAFT { background: #f3f4f6; color: #555; }
.row { display: flex; gap: 12px; }
.row > * { flex: 1; }
.error { background: #fee2e2; color: #b91c1c; padding: 10px 12px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.success { background: #dcfce7; color: #15803d; padding: 10px 12px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }