:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --border: #d9dce1;
  --text: #1f2329;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #047857;
  --warn: #b45309;
  --error: #b91c1c;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "PingFang TC", "Microsoft JhengHei", "Segoe UI",
    system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.app-header {
  padding: 20px 24px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.app-header h1 {
  margin: 0;
  font-size: 1.4rem;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.remaining {
  margin: 10px 0 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 20px;
  padding: 20px 24px;
  align-items: start;
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.panel-title {
  margin: 0 0 12px;
  font-size: 1rem;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

input[type="file"],
select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

input[type="file"] {
  padding: 8px;
}

.file-info {
  margin: -6px 0 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.mapping {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 12px 2px;
  margin-bottom: 16px;
  background: #fafbfc;
}

.actions {
  display: flex;
  gap: 10px;
}

.btn {
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:not(:disabled):hover {
  background: var(--primary-hover);
}

.message {
  margin: 14px 0 0;
  min-height: 1.4em;
  font-size: 0.9rem;
}

.message[data-type="success"] {
  color: var(--success);
}
.message[data-type="warn"] {
  color: var(--warn);
}
.message[data-type="error"] {
  color: var(--error);
}

.hint {
  margin: 10px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.preview {
  overflow: auto;
  max-height: 70vh;
}

.records-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.82rem;
}

.records-table th,
.records-table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  vertical-align: top;
}

.records-table th {
  background: #f1f5f9;
  position: sticky;
  top: 0;
}

.records-table td:first-child {
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
}

.rec-invalid {
  background: #fef2f2;
}

.rec-invalid td:last-child {
  color: var(--error);
}

.rec-valid td:last-child {
  color: var(--success);
}

.preview-note {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}