:root {
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --border: #e2e4e9;
  --accent: #2563eb;
  --accent-text: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
}

.site-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
.site-header h1 { font-size: 1.25rem; margin: 0; }

.tool {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 16px 24px;
  align-items: start;
}
@media (max-width: 768px) {
  .tool { grid-template-columns: 1fr; }
}

.pane {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-alt);
  padding: 16px;
}

.form-section { margin-bottom: 20px; }
.form-section h2 { font-size: 0.95rem; margin: 0 0 10px; }

.form-section label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.form-section input[type="text"],
.form-section input[type="email"],
.form-section input[type="date"],
.form-section input[type="number"],
.form-section textarea {
  font-size: 0.9rem;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}

.checkbox-label {
  flex-direction: row !important;
  align-items: center;
  gap: 8px !important;
}

.logo-preview {
  max-width: 120px;
  max-height: 60px;
  margin-bottom: 10px;
  display: block;
}
.logo-preview[hidden] {
  display: none;
}

.items-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 10px;
}
.items-table th {
  text-align: left;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 4px 6px;
}
.items-table td { padding: 4px 6px; }
.items-table input {
  width: 100%;
  font-size: 0.85rem;
  padding: 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

button {
  font-size: 0.8rem;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.download-btn {
  width: 100%;
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-size: 0.95rem;
  padding: 12px;
  font-weight: 600;
}

.invoice-preview {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  font-size: 0.85rem;
}

.preview-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}
.preview-logo { max-width: 80px; max-height: 80px; }
.preview-business { margin-bottom: 12px; }
.preview-biz-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.preview-biz-line { color: var(--text-muted); line-height: 1.4; white-space: pre-wrap; }

.preview-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.preview-client { margin-bottom: 20px; }
.preview-section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.preview-client-name { font-weight: 600; }

.preview-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}
.preview-table th {
  text-align: left;
  border-bottom: 2px solid var(--border);
  padding: 6px 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.preview-table td {
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
}
.preview-table th:last-child, .preview-table td:last-child { text-align: right; }
.preview-table th:nth-child(2), .preview-table td:nth-child(2),
.preview-table th:nth-child(3), .preview-table td:nth-child(3) { text-align: right; }

.preview-totals {
  margin-left: auto;
  width: 220px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}
.preview-totals > div { display: flex; justify-content: space-between; }
.preview-total-grand {
  font-weight: 700;
  font-size: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 4px;
  margin-top: 4px;
}

.preview-notes {
  white-space: pre-wrap;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.site-footer {
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.75rem;
}