:root {
  --primary-color: #4361ee;
  --secondary-color: #3f37c9;
  --accent-color: #4895ef;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --success-color: #4cc9f0;
  --warning-color: #f72585;
  --border-radius: 12px;
  --box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem;
  color: var(--dark-color);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.app-title {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-size: 2.5rem;
}

.app-subtitle {
  text-align: center;
  color: var(--dark-color);
  opacity: 0.8;
  margin-bottom: 2rem;
  font-weight: 300;
}

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
  gap: 0.5rem;
}

.tabs button {
  padding: 0.75rem 1.5rem;
  border: none;
  background-color: var(--light-color);
  color: var(--dark-color);
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tabs button.active {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.tabs button:hover:not(.active) {
  background-color: #e9ecef;
}

.tab-content {
  background-color: white;
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: var(--box-shadow);
  margin-bottom: 2rem;
}

.hidden {
  display: none;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--dark-color);
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(72, 149, 239, 0.2);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.upload-area {
  border: 2px dashed #ddd;
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-area:hover {
  border-color: var(--accent-color);
  background-color: rgba(72, 149, 239, 0.05);
}

.upload-area i {
  font-size: 2rem;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

.upload-area p {
  margin: 0;
  color: #666;
}

.upload-area input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

button {
  cursor: pointer;
  transition: var(--transition);
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  width: 100%;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(67, 97, 238, 0.4);
}

.secondary-btn {
  background-color: white;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 600;
  width: 100%;
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.secondary-btn:hover {
  background-color: rgba(67, 97, 238, 0.1);
}

.icon-btn {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: 1rem;
  padding: 0.5rem;
  border-radius: 50%;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background-color: rgba(67, 97, 238, 0.1);
}

.design-options {
  margin: 2rem 0;
}

.design-options h3 {
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.qr-preview-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 2rem;
}

#qrPreview {
  background-color: white;
  padding: 1rem;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.scan-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.or-divider {
  display: flex;
  align-items: center;
  color: #666;
  margin: 1rem 0;
}

.or-divider::before, .or-divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid #ddd;
}

.or-divider::before {
  margin-right: 1rem;
}

.or-divider::after {
  margin-left: 1rem;
}

.video-container {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

video {
  width: 100%;
  height: auto;
  display: block;
}

.result-container {
  margin-top: 2rem;
}

.result-container h3 {
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.result-box {
  background-color: var(--light-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#scanResult {
  flex: 1;
  word-break: break-all;
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }
  
  .container {
    padding: 0;
  }
  
  .tab-content {
    padding: 1.5rem;
  }
  
  .options-grid {
    grid-template-columns: 1fr;
  }
}
#copyQRBtn {
  margin-left: 10px;
  background: linear-gradient(to right, #4facfe, #00f2fe);
  color: white;
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

#copyQRBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
  cursor: pointer;
}