* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  min-height: 100vh;
  color: #e8e8e8;
  margin: 0;
  padding: 1.5rem;
}

.container {
  max-width: 640px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: #fff;
  margin: 0;
}

.auth-section,
.form-section,
.list-section {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.auth-section h2,
.form-section h2,
.list-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  color: #e0e0e0;
}

.form-row {
  margin-bottom: 1rem;
}

.form-row label {
  display: block;
  font-size: 0.85rem;
  color: #b0b0b0;
  margin-bottom: 0.35rem;
}

.form-row select,
.form-row input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23b0b0b0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form-row select:focus,
.form-row input:focus {
  outline: none;
  border-color: #7c3aed;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

button {
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

button:active {
  transform: scale(0.98);
}

#submit-btn {
  background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
  color: #fff;
}

#submit-btn:hover {
  background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

button.secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #e0e0e0;
}

button.secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

button.danger {
  background: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

button.danger:hover {
  background: rgba(239, 68, 68, 0.6);
}

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

.product-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.product-item:last-child {
  margin-bottom: 0;
}

.product-info {
  flex: 1;
}

.product-info .name {
  font-weight: 600;
  color: #fff;
}

.product-info .meta {
  font-size: 0.8rem;
  color: #a0a0a0;
  margin-top: 0.2rem;
}

.product-actions {
  display: flex;
  gap: 0.5rem;
}

.product-actions button {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}

.message {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  display: none;
}

.message.show {
  display: block;
}

.message.success {
  background: rgba(34, 197, 94, 0.2);
  color: #86efac;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.message.error {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.message.info {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
}