:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(15, 23, 42, 0.65);
  
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-radius-sm: 8px;
  --border-radius-md: 14px;
  --border-radius-lg: 20px;
  --border-radius-full: 9999px;
  
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(236, 72, 153, 0.10) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 60%);
}

/* Background grid mesh subtle effect */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  pointer-events: none;
  z-index: 0;
}

.site-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.site-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  background: rgba(9, 13, 22, 0.6);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: var(--accent-gradient);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--border-radius-full);
  background: rgba(99, 102, 241, 0.12);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px #22c55e;
}

/* Main Layout */
.main-content {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.hero-heading {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero-heading h1 {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.5;
}

/* App Grid */
.app-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 960px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.5rem;
}

.input-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.input-action-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.qr-input {
  width: 100%;
  padding: 1rem 5.5rem 1rem 1.15rem;
  background: var(--bg-input);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--border-radius-md);
  color: #ffffff;
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.qr-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-btns {
  position: absolute;
  right: 0.5rem;
  display: flex;
  gap: 0.35rem;
}

.mini-action-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  padding: 0.35rem 0.65rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: all var(--transition-fast);
}

.mini-action-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

/* Quick link preset pills */
.preset-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.pill-tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-full);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.pill-tag:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.35);
  color: #cbd5e1;
}

/* Collapsible Settings */
.settings-toggle {
  background: none;
  border: none;
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  padding: 0;
  transition: color var(--transition-fast);
}

.settings-toggle:hover {
  color: #a5b4fc;
}

.settings-panel {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.settings-panel.hidden {
  display: none;
}

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

.color-picker-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.color-picker-input {
  -webkit-appearance: none;
  border: none;
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  background: transparent;
  padding: 0;
}

.color-picker-input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker-input::-webkit-color-swatch {
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-sm);
}

.select-input {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-input);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--border-radius-sm);
  color: #ffffff;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
}

.select-input:focus {
  border-color: var(--accent-primary);
}

.select-input option {
  background: var(--bg-secondary);
  color: #ffffff;
}

/* Palette quick chips */
.palette-chips {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.color-chip {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.color-chip:hover {
  transform: scale(1.15);
  border-color: #ffffff;
}

/* Primary Generate Button */
.btn-primary {
  width: 100%;
  padding: 1.05rem;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--border-radius-md);
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  box-shadow: 0 10px 25px -5px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(99, 102, 241, 0.4);
}

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

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

/* Spinner */
.spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

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

.qr-frame {
  width: 280px;
  height: 280px;
  background: #ffffff;
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
  margin-bottom: 1.5rem;
  position: relative;
  transition: transform var(--transition-normal);
}

.qr-frame:hover {
  transform: scale(1.02);
}

.qr-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-dim);
}

.qr-placeholder svg {
  stroke: #94a3b8;
  opacity: 0.6;
}

.qr-placeholder span {
  font-size: 0.85rem;
  font-weight: 500;
}

.qr-details {
  width: 100%;
  margin-bottom: 1.25rem;
}

.qr-url-badge {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-sm);
  padding: 0.6rem 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-decoration: none;
  max-width: 100%;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.qr-url-badge:hover {
  border-color: var(--accent-primary);
  color: #ffffff;
}

/* Actions Row */
.action-buttons-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  width: 100%;
}

.btn-secondary {
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-md);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.btn-secondary.full-width {
  grid-column: span 2;
}

/* History Section */
.history-section {
  margin-top: 2.5rem;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.history-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.clear-history-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.75rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.clear-history-btn:hover {
  color: #ef4444;
}

.history-list {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--border-radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.history-item:hover {
  border-color: var(--accent-primary);
  color: #ffffff;
  background: rgba(99, 102, 241, 0.1);
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: #1e293b;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--border-radius-md);
  font-size: 0.875rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  border-left: 4px solid #22c55e;
}

.toast-error {
  border-left: 4px solid #ef4444;
}

/* Error messages */
.error-msg {
  color: #f87171;
  font-size: 0.8rem;
  margin-top: 0.4rem;
  display: block;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  background: rgba(9, 13, 22, 0.4);
}

.footer-kbd {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}