* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", sans-serif;
  background: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

h1 {
  font-size: 1.5rem;
  color: #2c3e50;
  margin-bottom: 4px;
}

.subtitle {
  font-size: 0.85rem;
  color: #7f8c8d;
  margin-bottom: 24px;
}

/* Form Section */
.form-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #555;
  margin-bottom: 6px;
}

.required {
  color: #e74c3c;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: #333;
  background: #fafafa;
  transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: #4a7fcb;
  background: #fff;
}

textarea {
  resize: vertical;
}

.price-input {
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-input input {
  width: auto;
  flex: 1;
}

.price-unit {
  font-size: 0.95rem;
  color: #555;
  white-space: nowrap;
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
  cursor: pointer;
  font-size: 0.9rem;
}

.checkbox-group input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: #4a7fcb;
}

.btn-generate {
  width: 100%;
  padding: 14px;
  background: #4a7fcb;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 8px;
}

.btn-generate:hover {
  background: #3a6fb8;
}

/* Result Section */
.result-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  margin-bottom: 24px;
}

.result-section h2 {
  font-size: 1rem;
  color: #2c3e50;
  margin-bottom: 12px;
}

.result-box textarea {
  width: 100%;
  background: #f8f9fa;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  resize: vertical;
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

.btn-copy {
  padding: 10px 24px;
  background: #27ae60;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-copy:hover {
  background: #219a52;
}

.copy-msg {
  font-size: 0.85rem;
  color: #27ae60;
  font-weight: 600;
}

/* History Section */
.history-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.history-header h2 {
  font-size: 1rem;
  color: #2c3e50;
}

.btn-clear-history {
  padding: 6px 12px;
  background: #fff;
  color: #e74c3c;
  border: 1px solid #e74c3c;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-clear-history:hover {
  background: #e74c3c;
  color: #fff;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 12px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.history-item:hover {
  border-color: #4a7fcb;
  background: #f0f5ff;
}

.history-item-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 4px;
}

.history-item-meta {
  font-size: 0.78rem;
  color: #999;
}

.history-item-preview {
  font-size: 0.82rem;
  color: #666;
  margin-top: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.empty-msg {
  font-size: 0.85rem;
  color: #aaa;
  text-align: center;
  padding: 16px 0;
}

/* Responsive */
@media (max-width: 480px) {
  .checkbox-group {
    flex-direction: column;
    gap: 8px;
  }
}