:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1f2937;
  background: #f9fafb;
}

* { box-sizing: border-box; }

body { margin: 0; padding: 1rem; }

.app { max-width: 900px; margin: 0 auto; }

header {
  border-bottom: 1px solid #e5e7eb;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

h1 { font-size: 1.5rem; margin: 0 0 0.5rem 0; }

.subtitle { color: #6b7280; font-size: 0.9rem; margin: 0; }

.loading {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  padding: 1.5rem;
  text-align: center;
  color: #6b7280;
}

.summary {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat {
  flex: 1;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  padding: 1rem;
}
.stat .label { color: #6b7280; font-size: 0.75rem; text-transform: uppercase; }
.stat .value { font-size: 1.5rem; font-weight: 600; margin-top: 0.25rem; }

.add-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.add-form input, .add-form select {
  padding: 0.5rem;
  border: 1px solid #d1d5db;
  border-radius: 0.25rem;
  font-size: 0.875rem;
}
.add-form input[placeholder='Client name'] { flex: 2; }
.add-form input[type='number'] { flex: 1; }

button {
  padding: 0.5rem 1rem;
  border: 1px solid #2563eb;
  background: #2563eb;
  color: white;
  border-radius: 0.25rem;
  cursor: pointer;
  font-size: 0.875rem;
}
button:hover { background: #1d4ed8; }
button.danger {
  background: #dc2626;
  border-color: #dc2626;
  padding: 0.125rem 0.5rem;
}

.invoices h2 { font-size: 1.1rem; margin-top: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  overflow: hidden;
}
th, td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid #e5e7eb;
  font-size: 0.875rem;
}
th { background: #f3f4f6; font-weight: 600; }
tr:last-child td { border-bottom: 0; }

.empty { color: #6b7280; text-align: center; font-style: italic; padding: 1rem; }

.status-pill {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 600;
}
.status-draft    { background: #f3f4f6; color: #4b5563; }
.status-open     { background: #dbeafe; color: #1e40af; }
.status-paid     { background: #d1fae5; color: #065f46; }
.status-overdue  { background: #fee2e2; color: #b91c1c; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #e5e7eb;
  color: #6b7280;
  font-size: 0.85rem;
}