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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

.container {
  display: flex;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
}

.panel {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 24px;
}

.form-panel {
  flex: 1;
  max-width: 600px;
}

.history-panel {
  flex: 1;
  max-width: 500px;
}

h2 {
  margin-bottom: 20px;
  color: #2c3e50;
  font-size: 1.5rem;
}

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

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: #555;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  transition: border-color 0.2s;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #3498db;
}

textarea {
  resize: vertical;
  min-height: 150px;
}

.radio-group {
  display: flex;
  gap: 20px;
}

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

button {
  background: #3498db;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #2980b9;
}

button:disabled {
  background: #bdc3c7;
  cursor: not-allowed;
}

.btn-secondary {
  background: #95a5a6;
  padding: 8px 16px;
  font-size: 14px;
}

.btn-secondary:hover {
  background: #7f8c8d;
}

.status {
  margin-top: 16px;
  padding: 12px;
  border-radius: 4px;
  font-weight: 500;
}

.status.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.status.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.hidden {
  display: none;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.history-header h2 {
  margin-bottom: 0;
}

.history-list {
  max-height: calc(100vh - 180px);
  overflow-y: auto;
}

.history-item {
  padding: 12px;
  border: 1px solid #eee;
  border-radius: 4px;
  margin-bottom: 10px;
  position: relative;
}

.history-item.success {
  border-left: 4px solid #27ae60;
}

.history-item.failed {
  border-left: 4px solid #e74c3c;
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.history-item-status {
  font-weight: 600;
  font-size: 13px;
}

.history-item.success .history-item-status {
  color: #27ae60;
}

.history-item.failed .history-item-status {
  color: #e74c3c;
}

.history-item-date {
  font-size: 12px;
  color: #888;
}

.history-item-to {
  font-size: 14px;
  color: #333;
  margin-bottom: 4px;
}

.history-item-subject {
  font-size: 13px;
  color: #666;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-error {
  font-size: 12px;
  color: #e74c3c;
  margin-top: 6px;
  word-break: break-word;
}

.delete-btn {
  background: none;
  border: none;
  color: #bbb;
  cursor: pointer;
  padding: 4px 8px;
  font-size: 16px;
  transition: color 0.2s;
}

.delete-btn:hover {
  color: #e74c3c;
  background: none;
}

.empty-message,
.loading-message {
  text-align: center;
  color: #999;
  padding: 40px 20px;
}

/* Asset Grid */
.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 10px;
  padding: 10px;
  background: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 4px;
}

.asset-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px;
  border: 2px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.asset-item:hover {
  background: #eee;
}

.asset-item img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.asset-item .asset-name {
  font-size: 11px;
  color: #666;
  margin-top: 4px;
  text-align: center;
  word-break: break-all;
}

.asset-item:has(input:checked) {
  border-color: #3498db;
  background: #e7f3fd;
}

.asset-item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 900px) {
  .container {
    flex-direction: column;
  }

  .form-panel,
  .history-panel {
    max-width: 100%;
  }

  .history-list {
    max-height: 400px;
  }
}