:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --bg-card: rgba(26, 26, 37, 0.6);

  --accent-purple: #8b5cf6;
  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-tertiary: rgba(255, 255, 255, 0.5);

  --border-color: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(139, 92, 246, 0.5);

  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Ambient Background Glow */
.ambient-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  top: -200px;
  right: -200px;
  pointer-events: none;
  z-index: 0;
  animation: float 20s ease-in-out infinite;
}

.ambient-glow--secondary {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
  top: auto;
  bottom: -150px;
  left: -150px;
  right: auto;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* App Container */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.25rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.logo-icon svg {
  width: 24px;
  height: 24px;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.back-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

/* Panel */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.panel-step {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.panel-title h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.panel-title p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* Form Styles */
.form-section {
  margin-bottom: 24px;
}

.form-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

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

.form-field label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-field label svg {
  opacity: 0.6;
}

.required {
  color: var(--accent-pink);
}

.form-field input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.form-field input::placeholder {
  color: var(--text-tertiary);
}

.form-field input:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* Style Options */
.style-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

@media (max-width: 600px) {
  .style-options {
    grid-template-columns: repeat(2, 1fr);
  }
}

.style-option {
  cursor: pointer;
  text-align: center;
  padding: 12px 8px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  background: var(--bg-primary);
}

.style-option:hover {
  border-color: var(--border-color);
}

.style-option.active {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.1);
}

.style-preview {
  width: 100%;
  height: 40px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.style-preview.theme-cyber {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.style-preview.theme-minimal {
  background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
  border: 1px solid #e0e0e0;
}

.style-preview.theme-gradient {
  background: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 50%, #06b6d4 100%);
}

.style-preview.theme-dark {
  background: linear-gradient(135deg, #0a0a0f 0%, #1a1a25 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.style-option span {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Generate Button */
.generate-btn {
  width: 100%;
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.generate-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(139, 92, 246, 0.4);
}

.generate-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.generate-btn:active:not(:disabled) {
  transform: translateY(0);
}

/* Preview Container */
.preview-container {
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Empty State */
.empty-state {
  text-align: center;
  color: var(--text-tertiary);
}

.empty-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border-color);
}

.empty-state p {
  line-height: 1.8;
}

/* Card Preview */
.card-preview {
  display: none;
  position: relative;
  width: 100%;
  max-width: 360px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-card);
  animation: cardAppear 0.5s ease;
}

@keyframes cardAppear {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.card-preview.active {
  display: block;
}

.card-glow {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  pointer-events: none;
}

.card-content {
  position: relative;
  z-index: 1;
  padding: 28px;
}

/* Card Themes */
.card-preview.theme-cyber {
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(22, 33, 62, 0.95) 100%);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.card-preview.theme-cyber .card-glow {
  background: radial-gradient(ellipse at top right, rgba(139, 92, 246, 0.2) 0%, transparent 50%),
              radial-gradient(ellipse at bottom left, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
}

.card-preview.theme-minimal {
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
  border: 1px solid #e9ecef;
}

.card-preview.theme-minimal .card-name,
.card-preview.theme-minimal .card-title,
.card-preview.theme-minimal .detail-item {
  color: #1a1a2e;
}

.card-preview.theme-minimal .card-divider {
  background: #e9ecef;
}

.card-preview.theme-gradient {
  background: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 50%, #06b6d4 100%);
}

.card-preview.theme-gradient .card-avatar {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

.card-preview.theme-dark {
  background: linear-gradient(135deg, #0a0a0f 0%, #1a1a25 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-preview.theme-dark .card-glow {
  background: radial-gradient(ellipse at top right, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
}

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.card-avatar {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.card-name {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.card-title {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.card-divider {
  height: 1px;
  background: var(--border-color);
  margin-bottom: 20px;
}

/* Card Details */
.card-details {
  margin-bottom: 24px;
}

.detail-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.detail-item svg {
  opacity: 0.6;
  flex-shrink: 0;
}

/* QR Code Section */
.card-qr {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
}

.qr-frame {
  position: relative;
  width: 224px;
  height: 224px;
  margin: 0 auto 12px;
  background: white;
  border-radius: var(--radius-md);
  padding: 12px;
}

.qr-frame canvas {
  width: 200px !important;
  height: 200px !important;
  display: block;
}

/* qrcodejs generates img or canvas */
#qrcode-container {
  width: 200px;
  height: 200px;
  margin: 0 auto;
}

#qrcode-container img,
#qrcode-container canvas {
  width: 200px !important;
  height: 200px !important;
  display: block;
  border: none;
}

.qr-placeholder {
  position: absolute;
  inset: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

.qr-placeholder svg {
  margin-bottom: 8px;
  opacity: 0.5;
}

.qr-placeholder span {
  font-size: 0.6875rem;
}

.qr-tip {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* Download Section */
.download-section {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

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

.download-btn {
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.download-btn:hover {
  background: var(--bg-primary);
  border-color: var(--border-focus);
  color: var(--text-primary);
}

.download-btn--primary {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
  border-color: transparent;
  color: white;
}

.download-btn--primary:hover {
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
}

/* Tips Section */
.tips {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

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

.tip-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-fast);
}

.tip-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.tip-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.2));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--accent-purple);
}

.tip-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* Footer */
.app-footer {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 24px;
  color: var(--text-primary);
  font-size: 0.875rem;
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
}