body {
  font-family: -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", sans-serif;
  margin: 0;
  padding: 0;
  background: #f7f7f9;
  color: #1a1a1a;
}

header {
  background: #22314e;
  color: #fff;
  padding: 16px 24px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 20px;
}

main {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px;
}

section {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.upload-panel label {
  display: block;
  margin-top: 12px;
  font-weight: bold;
}

.upload-panel select,
.upload-panel input[type="file"] {
  display: block;
  margin-top: 4px;
}

.upload-panel button,
.download-panel button {
  margin-top: 16px;
  margin-right: 8px;
  padding: 8px 16px;
  background: #22314e;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.warning-banner {
  background: #fff3cd;
  border: 1px solid #ffe08a;
  color: #7a5b00;
}

.hidden {
  display: none;
}

.summary-panel dl {
  display: grid;
  grid-template-columns: 200px 1fr;
  row-gap: 4px;
}

.summary-panel dt {
  font-weight: bold;
}

.mismatch {
  color: #c0392b;
  font-weight: bold;
}

#previewTable {
  width: 100%;
  border-collapse: collapse;
}

#previewTable th,
#previewTable td {
  border: 1px solid #ddd;
  padding: 6px 8px;
  font-size: 13px;
}

#previewTable th {
  background: #f0f0f4;
}