* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Meiryo", sans-serif;
  margin: 0;
  padding: 0 1.5rem 2rem;
  background: #f5f6f8;
  color: #1a1a1a;
}

header {
  padding: 1.5rem 0 0.5rem;
}

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

.disclaimer {
  background: #fff3cd;
  border: 1px solid #ffe69c;
  color: #664d03;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.5;
}

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

section {
  background: #fff;
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

textarea {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  resize: vertical;
}

.file-row {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.action-row {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

button {
  background: #2f5fd6;
  color: #fff;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
}

button:disabled {
  background: #b7c2d9;
  cursor: not-allowed;
}

.error {
  color: #b3261e;
  font-size: 0.85rem;
}

.result-columns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.result-column {
  flex: 1 1 300px;
  min-width: 0;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f0f1f4;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 0.75rem;
  min-height: 8rem;
  font-size: 0.85rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

th, td {
  border: 1px solid #ddd;
  padding: 0.4rem 0.6rem;
  text-align: left;
}

th {
  background: #eef1f7;
}

#download-masked-button {
  margin-top: 0.5rem;
}