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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  min-height: 100vh;
  color: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  max-width: 600px;
  width: 100%;
}

header {
  text-align: center;
  margin-bottom: 40px;
  color: white;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.main-content {
  display: grid;

  margin-bottom: 30px;
}

@media (max-width: 768px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

.generator-section {
  background: rgba(30, 41, 59, 0.9);
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(71, 85, 105, 0.3);
}

.generator-section h2 {
  color: #e2e8f0;
  margin-bottom: 25px;
  font-size: 1.5rem;
  border-bottom: 3px solid #3b82f6;
  padding-bottom: 10px;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  margin-bottom: 8px;
  color: #e2e8f0;
  font-size: 0.95rem;
}

.form-group input {
  padding: 12px 15px;
  border: 2px solid #475569;
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: #1e293b;
  color: #e2e8f0;
}

.form-group input:focus {
  outline: none;
  border-color: #3b82f6;
  background: #334155;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn {
  padding: 12px 25px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(79, 172, 254, 0.4);
}

.btn-danger {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
  color: white;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
}

.qr-result {
  margin-top: 25px;
  text-align: center;
}

#qrCodeContainer {
  background: #1e293b;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  margin-bottom: 15px;
  display: inline-block;
  border: 1px solid #475569;
}

#jsonPreview {
  background: #1e293b;
  padding: 15px;
  border-radius: 8px;
  border-left: 4px solid #3b82f6;
  text-align: left;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-all;
}

.hidden {
  display: none !important;
}

.success {
  border-color: #48bb78 !important;
  background-color: #f0fff4 !important;
}

.error {
  border-color: #f56565 !important;
  background-color: #fff5f5 !important;
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}