/* Modern CSS Variables & Reset */
:root {
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Color Palette (Slate / Indigo theme) */
  --bg-app: #0b0f19;
  --card-bg: rgba(17, 24, 39, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.45);
  --secondary: #1e293b;
  --secondary-hover: #334155;
  --accent: #10b981;
  
  --border-radius-lg: 20px;
  --border-radius-md: 12px;
  --border-radius-sm: 8px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --glow-shadow: 0 0 25px var(--primary-glow);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 20px;
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.12) 0px, transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
.app-header {
  margin-bottom: 40px;
  text-align: center;
}

.logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-icon {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: white;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

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

.app-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(to right, #f8fafc, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
}

/* Workspace Layout */
.workspace {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 30px;
  align-items: start;
}

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

/* Cards (Glassmorphism) */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  padding: 30px;
  box-shadow: var(--glass-shadow);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

/* Settings Panel */
.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.panel-section {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 25px;
}

.panel-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.panel-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #f1f5f9;
}

.step-num {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 700;
}

/* Inputs & Form Controls */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.input-group:last-child {
  margin-bottom: 0;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

input[type="text"],
select,
input[type="number"] {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: all var(--transition-fast);
  outline: none;
}

input[type="text"]:focus,
select:focus,
input[type="number"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
  background: rgba(15, 23, 42, 0.8);
}

/* Grids */
.color-options-grid,
.design-grid,
.logo-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (max-width: 600px) {
  .color-options-grid,
  .design-grid,
  .logo-options-grid {
    grid-template-columns: 1fr;
  }
}

/* Color Picker Wrapper */
.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 12px;
  border-radius: var(--border-radius-md);
  height: 48px;
}

input[type="color"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.color-hex {
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  text-transform: uppercase;
}

/* Logo File Upload */
.logo-section {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.file-upload-wrapper {
  position: relative;
  flex: 1;
}

.file-input {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px dashed rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
  padding: 12px;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.file-label:hover {
  background: rgba(99, 102, 241, 0.18);
  border-color: var(--primary);
}

/* Slider Style */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  height: 6px;
  border-radius: 3px;
  outline: none;
  margin: 12px 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  transition: transform 0.1s ease;
  box-shadow: 0 0 10px var(--primary-glow);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Buttons */
.btn {
  font-family: var(--font-sans);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
}

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

.btn-secondary {
  background: var(--secondary);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.btn-secondary:hover {
  background: var(--secondary-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Preview Card */
.preview-panel {
  position: sticky;
  top: 40px;
}

.preview-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.preview-header {
  display: flex;
  width: 100%;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.preview-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.status-badge {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: pulse 2s infinite;
}

/* QR Code Canvas container */
.qr-code-wrapper {
  background: white;
  padding: 24px;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  margin-bottom: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Give the white canvas wrapper a glowing shadow when focused or updated */
.qr-code-wrapper:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.25), 0 0 20px rgba(99, 102, 241, 0.15);
}

#qr-code-canvas {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 280px;
  height: 280px;
}

#qr-code-canvas canvas {
  max-width: 100%;
  height: auto !important;
}

/* Download Formats Selector */
.download-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.download-format-selector {
  display: flex;
  background: rgba(15, 23, 42, 0.6);
  padding: 4px;
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 8px;
}

.format-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 10px;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

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

.format-btn.active {
  background: var(--secondary-hover);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Animations */
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}