/* ============================================
   CSS Custom Properties (Design System)
   ============================================ */
:root {
  /* Colors - Dark Theme with Vibrant Accents */
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #151932;
  --color-bg-card: rgba(30, 35, 60, 0.6);
  --color-bg-card-hover: rgba(40, 45, 75, 0.8);

  /* Gradient Accents */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-danger: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0aec0;
  --color-text-muted: #718096;

  /* Border & Shadow */
  --color-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated Background */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 50%,
      rgba(102, 126, 234, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(118, 75, 162, 0.1) 0%,
      transparent 50%
    );
  z-index: -1;
  animation: backgroundPulse 15s ease-in-out infinite;
}

@keyframes backgroundPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* ============================================
   Header
   ============================================ */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  animation: fadeInDown 0.6s ease-out;
}

.header-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.title {
  font-size: 3rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  line-height: 1.2;
}

.title-icon {
  width: 2.5rem;
  height: 2.5rem;
  filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
  margin-bottom: var(--spacing-xs);
}

.subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  font-weight: 300;
}

/* YouTube Link */
.youtube-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, #ff0000 0%, #cc0000 100%);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--font-size-sm);
  box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
  transition: all var(--transition-base);
  animation: pulse-glow 2s ease-in-out infinite;
  margin-top: var(--spacing-md);
}

.youtube-link:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 4px 15px rgba(255, 0, 0, 0.5);
  animation: none;
  color: white;
}

.youtube-icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

@keyframes pulse-glow {
  0%,
  100% {
    box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
  }
  50% {
    box-shadow: 0 2px 15px rgba(255, 0, 0, 0.5);
  }
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  animation: fadeInUp 0.6s ease-out;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(102, 126, 234, 0.3);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

/* ============================================
   Forms
   ============================================ */
.item-form {
  display: grid;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: all var(--transition-base);
}

.form-input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  background: rgba(30, 35, 60, 0.8);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-icon {
  font-size: var(--font-size-lg);
  position: relative;
  z-index: 1;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: rgba(102, 126, 234, 0.3);
}

.btn-danger {
  background: var(--gradient-danger);
  color: white;
}

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

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

/* ============================================
   Margin Control
   ============================================ */
.margin-control {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.margin-value {
  color: #667eea;
  font-weight: 700;
  font-size: var(--font-size-xl);
}

.slider-container {
  position: relative;
}

.margin-slider {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-secondary);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.margin-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.margin-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.margin-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.margin-slider::-moz-range-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xs);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* ============================================
   Summary Section
   ============================================ */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.summary-item:hover {
  transform: translateY(-2px);
  border-color: rgba(102, 126, 234, 0.3);
}

.summary-item.total {
  background: var(--gradient-primary);
  border: none;
}

.summary-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.summary-item.total .summary-label {
  color: rgba(255, 255, 255, 0.9);
}

.summary-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.summary-value.highlight {
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   Items Section
   ============================================ */
.items-section {
  animation: fadeInUp 0.8s ease-out;
}

.items-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.items-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-md);
}

.item-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
  animation: fadeInScale 0.4s ease-out;
}

.item-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(102, 126, 234, 0.5);
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.item-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.item-url {
  font-size: var(--font-size-sm);
  color: #667eea;
  text-decoration: none;
  word-break: break-all;
  transition: color var(--transition-fast);
}

.item-url:hover {
  color: #764ba2;
  text-decoration: underline;
}

.item-price {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: var(--gradient-success);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: var(--spacing-sm) 0;
}

.item-actions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
  flex-wrap: wrap; /* Allow buttons to wrap if needed */
}

.item-actions .btn {
  flex: 1;
  min-width: 80px; /* Prevent buttons from becoming too narrow */
  white-space: nowrap; /* Prevent text wrapping inside button */
  justify-content: center;
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.empty-subtext {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  text-align: center;
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm);
  }

  .title {
    font-size: var(--font-size-2xl);
  }

  .subtitle {
    font-size: var(--font-size-base);
  }

  .items-grid {
    grid-template-columns: 1fr;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .items-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .items-actions {
    width: 100%;
  }

  .items-actions .btn {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .header-content {
    padding: var(--spacing-md);
  }

  .title {
    font-size: var(--font-size-xl);
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .card {
    padding: var(--spacing-md);
  }

  .summary-value {
    font-size: var(--font-size-xl);
  }
}

/* =========================================
   AI Auto-Fill & Settings Styles
   ========================================= */

/* Settings Button */
.settings-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: transform 0.3s ease, background-color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.settings-btn:hover {
  transform: rotate(45deg);
  background-color: rgba(255, 255, 255, 0.1);
}

/* Auto-Fill Button */
.input-group {
  display: flex;
  gap: 10px;
  align-items: center;
}

.input-group .form-input {
  flex: 1;
}

.btn-icon-only {
  background: var(--gradient-primary);
  border: none;
  color: white;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-icon-only:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

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

.btn-icon-only.loading {
  animation: pulse 1.5s infinite;
  cursor: wait;
  opacity: 0.8;
}

/* Modal Styles */
.modal {
  display: none; /* Hidden by default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.show {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: rgba(30, 35, 60, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.3s ease;
  padding: 0;
  overflow: hidden;
}

.modal.show .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--color-text-primary);
}

.close-modal {
  color: var(--color-text-secondary);
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s ease;
}

.close-modal:hover {
  color: var(--color-danger);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: flex-end;
  background: rgba(255, 255, 255, 0.02);
}

.help-text {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 1rem;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox-group label {
  cursor: pointer;
  user-select: none;
}

/* ============================================
   UX Improvements Styles
   ============================================ */

/* Quick Add Toggle */
.quick-add-toggle {
  margin-top: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.quick-add-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.quick-add-toggle label {
  cursor: pointer;
  user-select: none;
}

/* Item Count Badge */
.item-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: normal;
}

/* Cancel Edit Button */
#cancelEditBtn {
  margin-left: var(--spacing-xs);
}

#cancelEditBtn.hidden {
  display: none;
}

/* Clear All Button (Danger Style) */
.btn-danger {
  background: var(--gradient-danger);
  color: var(--color-text-primary);
  border: none;
  transition: all 0.3s ease;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  filter: brightness(1.1);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
}

.toast {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  min-width: 300px;
  max-width: 400px;
  pointer-events: auto;
  animation: slideIn 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.toast.success {
  border-left: 4px solid #10b981;
}

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

.toast.info {
  border-left: 4px solid #3b82f6;
}

.toast.warning {
  border-left: 4px solid #f59e0b;
}

.toast-icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.toast-message {
  flex: 1;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
  font-size: var(--font-size-lg);
  line-height: 1;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.toast-close:hover {
  opacity: 1;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.toast.removing {
  animation: slideOut 0.3s ease-in forwards;
}

/* Item Highlight Animation */
@keyframes highlightItem {
  0% {
    background: rgba(102, 126, 234, 0.3);
    transform: scale(1.02);
  }
  100% {
    background: transparent;
    transform: scale(1);
  }
}

.item-card.newly-added {
  animation: highlightItem 1s ease-out;
}

/* Edit Mode Styles */
.item-card.editing {
  border: 2px solid #667eea;
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.4);
}

/* Duplicate Button */
.btn-duplicate {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* Responsive Toast */
@media (max-width: 768px) {
  .toast-container {
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }

  .toast {
    min-width: auto;
    max-width: none;
  }
}