/* ============================================
   CSS VARIABLES - THEME SYSTEM
   ============================================ */
:root {
  /* Colors */
  --color-primary: #4b6bfb;
  --color-primary-hover: #3b5be8;
  --color-primary-light: #f0f4ff;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #f5f7fa;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 40px;
  
  /* Typography */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 15px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 24px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.4;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.16);
  --shadow-primary: 0 2px 8px rgba(75, 107, 251, 0.2);
  --shadow-primary-hover: 0 4px 12px rgba(75, 107, 251, 0.3);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  font-size: 14px;
  height: 100%;
  overflow: hidden;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  margin: 0;
  padding: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

.container {
  height: 100vh;
  overflow: hidden;
  padding: 0;
}

main {
  height: 100%;
  overflow: hidden;
  padding: 0;
}

/* Focus styles */
.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem rgba(75, 107, 251, 0.25);
}

/* Footer */
footer {
  display: none !important;
}

/* ============================================
   CHAT CONTAINER
   ============================================ */
.chat-container {
  max-width: 900px;
  margin: var(--spacing-lg) auto;
  height: calc(100vh - var(--spacing-lg) * 2);
  display: flex;
  flex-direction: column;
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0, 0, 0, 0.04);
  overflow: hidden;
}

.chat-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #5b7cff 100%);
  color: white;
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: center;
  border-bottom: none;
  position: relative;
}

.chat-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.chat-title {
  margin: 0;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  line-height: var(--line-height-tight);
}

.chat-subtitle {
  margin: var(--spacing-sm) 0 0 0;
  font-size: var(--font-size-sm);
  opacity: 0.95;
  font-weight: var(--font-weight-normal);
}

/* ============================================
   MESSAGES AREA
   ============================================ */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  background: var(--color-bg-secondary);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
}

.message {
  display: flex;
  animation: messageFadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes messageFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.user-message {
  justify-content: flex-end;
}

.bot-message {
  justify-content: flex-start;
}

.message-content {
  max-width: 75%;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  word-wrap: break-word;
  line-height: var(--line-height-relaxed);
  font-size: var(--font-size-base);
  position: relative;
}

.user-message .message-content {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
  box-shadow: var(--shadow-primary);
}

.bot-message .message-content {
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  border-bottom-left-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
}

.bot-message .message-content.has-products {
  max-width: 100%;
  padding: var(--spacing-xl);
  background: var(--color-bg-primary);
}

.bot-message .message-content.has-products > p:last-of-type {
  margin-bottom: 0;
  padding-bottom: var(--spacing-md);
}

.message-content p {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* ============================================
   PRODUCT CARDS SECTION
   ============================================ */
.products-header {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: var(--spacing-xl) 0 var(--spacing-md) 0;
  padding: var(--spacing-lg) 0 var(--spacing-md) 0;
  border-top: 2px solid var(--color-border-light);
  letter-spacing: -0.01em;
  position: relative;
}

.products-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

.products-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  padding: 0;
}

.product-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  animation: cardFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}

.product-card:nth-child(1) { animation-delay: 0.05s; }
.product-card:nth-child(2) { animation-delay: 0.1s; }
.product-card:nth-child(3) { animation-delay: 0.15s; }
.product-card:nth-child(4) { animation-delay: 0.2s; }
.product-card:nth-child(5) { animation-delay: 0.25s; }

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.product-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--spacing-md);
  position: relative;
}

.product-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.02) 100%);
  pointer-events: none;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-content {
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-sm) 0;
  line-height: var(--line-height-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  letter-spacing: -0.01em;
}

.product-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  margin: 0 0 var(--spacing-md) 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-light);
}

.price-badge {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  letter-spacing: 0.01em;
}

.product-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-base);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
}

.product-link:hover {
  color: var(--color-primary-hover);
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  transform: translateX(2px);
}

/* ============================================
   AMAZON DISCLAIMER
   ============================================ */
.amazon-disclaimer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--color-border-light);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: var(--line-height-relaxed);
  position: relative;
}

.amazon-disclaimer::before {
  content: 'ℹ️';
  margin-right: var(--spacing-xs);
}

/* ============================================
   INPUT AREA
   ============================================ */
.chat-input-container {
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border-light);
  flex-shrink: 0;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.04);
}

.input-wrapper {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-end;
  max-width: 100%;
}

.chat-input {
  flex: 1;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  resize: none;
  max-height: 120px;
  font-family: inherit;
  transition: all var(--transition-base);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

.chat-input:disabled {
  background: var(--color-bg-secondary);
  cursor: not-allowed;
}

.send-button {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-primary);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  flex-shrink: 0;
  box-shadow: var(--shadow-primary);
}

.send-button:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-hover);
}

.send-button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-primary);
}

.send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.send-button svg {
  width: 18px;
  height: 18px;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
.chat-messages::-webkit-scrollbar {
  width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* ============================================
   TYPING INDICATOR
   ============================================ */
.typing-indicator {
  display: inline-flex;
  gap: 6px;
  padding: var(--spacing-xs) 0;
  align-items: center;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-tertiary);
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.6;
  }
  30% {
    transform: translateY(-8px);
    opacity: 1;
  }
}

/* ============================================
   PRODUCTS LOADING INDICATOR
   ============================================ */
.products-loading {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.loading-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--color-border-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.products-loading span {
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
}

/* ============================================
   SUGGESTIONS
   ============================================ */
.chat-suggestions {
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border-light);
  animation: fadeIn var(--transition-slow) ease-in;
  flex-shrink: 0;
  overflow: hidden;
}

.chat-input-container {
  border-bottom: none;
}

.chat-suggestions.hidden {
  display: none;
}

.suggestions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-md);
  max-width: 100%;
}

.suggestion-button {
  background: var(--color-bg-secondary);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  font-family: inherit;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  font-weight: var(--font-weight-normal);
}

.suggestion-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  transition: left 0.5s;
}

.suggestion-button:hover::before {
  left: 100%;
}

.suggestion-button:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text-primary);
}

.suggestion-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.suggestion-button span {
  display: block;
  line-height: var(--line-height-tight);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .chat-container {
    margin: 0;
    height: 100vh;
    border-radius: 0;
  }
  
  .chat-header {
    padding: var(--spacing-lg) var(--spacing-lg);
  }
  
  .chat-title {
    font-size: var(--font-size-xl);
  }
  
  .chat-subtitle {
    font-size: var(--font-size-sm);
  }
  
  .chat-messages {
    padding: var(--spacing-lg) var(--spacing-md);
    gap: var(--spacing-md);
  }
  
  .message-content {
    max-width: 85%;
    padding: var(--spacing-md) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .products-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .product-image {
    height: 180px;
    padding: var(--spacing-md);
  }
  
  .chat-input-container {
    padding: var(--spacing-md);
  }
  
  .chat-input {
    font-size: var(--font-size-sm);
    padding: var(--spacing-md);
  }
  
  .send-button {
    width: 40px;
    height: 40px;
    min-width: 40px;
  }
  
  .send-button svg {
    width: 16px;
    height: 16px;
  }
  
  .suggestions-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .chat-suggestions {
    padding: var(--spacing-md);
  }
  
  .suggestion-button {
    padding: var(--spacing-md);
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  .chat-container {
    margin: var(--spacing-md);
    border-radius: var(--radius-md);
  }
  
  .chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .chat-title {
    font-size: var(--font-size-lg);
  }
  
  .chat-messages {
    padding: var(--spacing-md) var(--spacing-md);
  }
  
  .message-content {
    max-width: 90%;
  }
  
  .product-image {
    height: 160px;
    padding: var(--spacing-sm);
  }
  
  .products-header {
    font-size: var(--font-size-base);
  }
}