* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: #f7f4ee;
  color: #333;
  line-height: 1.7;
}

.app-header {
  padding: 20px;
  background: #f0e7d8;
  border-bottom: 1px solid #ddd0bd;
}

.app-header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.app-header p {
  margin: 6px 0 0;
  color: #665;
  font-size: 0.95rem;
}

.app-layout {
  display: grid;
  grid-template-columns: 1.1fr 1.1fr 280px;
  gap: 16px;
  padding: 16px;
}

.editor-area,
.preview-area,
.memo-list-area {
  background: #fff;
  border: 1px solid #e0d8ca;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.title-row input {
  width: 100%;
  padding: 12px;
  font-size: 1rem;
  border: 1px solid #d8ccb8;
  border-radius: 8px;
  margin-bottom: 12px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

button {
  border: none;
  border-radius: 8px;
  background: #6b8e6b;
  color: #fff;
  padding: 9px 12px;
  font-size: 0.95rem;
  cursor: pointer;
}

button:hover {
  opacity: 0.88;
}

.toolbar button {
  background: #8b7355;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.hint {
  min-height: 32px;
  padding: 8px 10px;
  margin-bottom: 10px;
  background: #fff8e8;
  border-left: 4px solid #d6a84f;
  border-radius: 6px;
  font-size: 0.92rem;
  color: #5c4a2f;
}

textarea {
  width: 100%;
  height: 440px;
  padding: 14px;
  border: 1px solid #d8ccb8;
  border-radius: 10px;
  font-size: 1rem;
  line-height: 1.7;
  resize: vertical;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid #eadfcd;
  margin-bottom: 12px;
}

.preview-header h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.preview-header span {
  font-size: 0.85rem;
  color: #777;
}

.preview {
  min-height: 500px;
  padding: 4px 2px;
  word-break: break-word;
}

.preview h1 {
  font-size: 1.6rem;
  border-bottom: 2px solid #e4d7c3;
  padding-bottom: 6px;
}

.preview h2 {
  font-size: 1.3rem;
  border-left: 5px solid #8b7355;
  padding-left: 10px;
  margin-top: 1.7em;
}

.preview blockquote {
  margin: 1em 0;
  padding: 10px 14px;
  background: #f7f4ee;
  border-left: 5px solid #b69a75;
  color: #555;
}

.preview code {
  background: #f2eee7;
  padding: 2px 5px;
  border-radius: 4px;
}

.memo-list-area h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

#memoList {
  list-style: none;
  padding: 0;
  margin: 0;
}

#memoList li {
  padding: 10px;
  border-bottom: 1px solid #eee4d4;
  cursor: pointer;
}

#memoList li:hover {
  background: #f8f2e8;
}

.memo-date {
  display: block;
  color: #777;
  font-size: 0.8rem;
}

.app-footer {
  padding: 16px 20px;
  color: #666;
  font-size: 0.9rem;
}

/* スマホ表示 */
@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  textarea {
    height: 320px;
  }

  .preview {
    min-height: 260px;
  }
}