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

:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #8b5cf6;
  --success-color: #10b981;
  --background: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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: 2rem 1rem;
  color: var(--text-primary);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  color: white;
}

header h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
  font-size: 1.25rem;
  opacity: 0.95;
}

.generator-card {
  background: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 2rem;
}

@media (max-width: 1024px) {
  .generator-card {
    grid-template-columns: 1fr;
  }
}

.form-section h2,
.preview-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.media-type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
  max-height: 400px;
  overflow-y: auto;
  padding: 0.5rem;
}

.media-type-card {
  background: var(--background);
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.media-type-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.media-type-card.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.media-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.media-name {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.media-description {
  font-size: 0.75rem;
  opacity: 0.8;
  line-height: 1.3;
}

.media-type-card.active .media-description {
  opacity: 0.95;
}

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

.input-group.hidden {
  display: none;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-size: 0.875rem;
}

input[type="text"],
input[type="url"],
input[type="email"],
input[type="tel"],
textarea,
select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: border-color 0.2s ease;
  font-family: inherit;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

.format-selector {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--background);
  border-radius: 0.75rem;
}

.format-selector label {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.format-buttons {
  display: flex;
  gap: 0.75rem;
}

.format-btn {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  background: white;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.format-btn:hover {
  border-color: var(--primary-color);
  background: var(--background);
}

.format-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.generate-btn {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow);
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.generate-btn:active {
  transform: translateY(0);
}

.preview-section {
  position: sticky;
  top: 2rem;
  height: fit-content;
}

.qr-preview {
  background: var(--background);
  border: 2px dashed var(--border-color);
  border-radius: 0.75rem;
  padding: 2rem;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.placeholder {
  text-align: center;
  color: var(--text-secondary);
}

.placeholder-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.placeholder p {
  font-size: 1rem;
}

.qr-image {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
}

.download-btn {
  width: 100%;
  padding: 1rem;
  background: var(--success-color);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.download-btn:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.download-btn.hidden {
  display: none;
}

footer {
  text-align: center;
  margin-top: 3rem;
  color: white;
  opacity: 0.9;
}

footer p {
  font-size: 0.875rem;
}

/* Scrollbar styling */
.media-type-grid::-webkit-scrollbar {
  width: 8px;
}

.media-type-grid::-webkit-scrollbar-track {
  background: var(--background);
  border-radius: 4px;
}

.media-type-grid::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.media-type-grid::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Checkbox styling */
input[type="checkbox"] {
  width: auto;
  margin-right: 0.5rem;
  cursor: pointer;
}

label:has(input[type="checkbox"]) {
  display: flex;
  align-items: center;
  cursor: pointer;
}