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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 40px 16px;
  color: #333;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

h1 {
  text-align: center;
  color: #fff;
  margin-bottom: 8px;
  font-size: 2.2rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
  text-align: center;
  color: rgba(255,255,255,0.9);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.card, .result-card {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  margin-bottom: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  color: #444;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d0d0d0;
  border-radius: 10px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102,126,234,0.2);
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid #d0d0d0;
  border-radius: 10px;
  background: #fafafa;
  cursor: pointer;
  font-size: 0.95rem;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: #667eea;
  width: 16px;
  height: 16px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.btn {
  border: none;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.05s, opacity 0.2s;
}

.btn:active {
  transform: scale(0.97);
}

.primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
}

.secondary {
  background: #f0f0f0;
  color: #333;
}

.ghost {
  background: transparent;
  color: #555;
  border: 1px solid #ccc;
}

.result-card h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
  color: #333;
}

.status {
  min-height: 22px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: #666;
}

.status.error {
  color: #d32f2f;
}

.status.success {
  color: #2e7d32;
}

.result {
  background: #f7f7f9;
  border: 1px solid #e3e3e3;
  border-radius: 10px;
  padding: 12px;
  max-height: 320px;
  overflow-y: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

.result .uid-item {
  padding: 4px 0;
  border-bottom: 1px dashed #e5e5e5;
  white-space: nowrap;
  overflow-x: auto;
  cursor: pointer;
  position: relative;
}

.result .uid-item:last-child {
  border-bottom: none;
}

.result .uid-item.copied::after {
  content: '已复制';
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: #2e7d32;
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  pointer-events: none;
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.6rem;
  }
  .actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
}