/* 
 * Flight Search Agent - Split Panel Chat Interface
 */

:root {
  --color-bg: #F8F9FA;
  --color-surface: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #5F6368;
  --color-text-muted: #9AA0A6;
  --color-border: #E8EAED;
  --color-accent: #1A1A1A;
  --color-accent-light: #F0F0F0;
  --color-success: #5F6368;
  --color-error: #5F6368;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

/* ============================================
   LOGO STYLES
   ============================================ */
.logo-header {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
}

.logo {
  height: 40px;
  width: auto;
}

.chat-logo-header {
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
}

.chat-logo {
  height: 32px;
  width: auto;
}

/* ============================================
   INITIAL SEARCH VIEW
   ============================================ */
.initial-view {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  padding-bottom: 15vh;
}

.initial-main {
  width: 100%;
  max-width: 640px;
  text-align: center;
}

.initial-title {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}

.initial-form {
  width: 100%;
}

.initial-input-wrapper {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.initial-input-wrapper:focus-within {
  box-shadow: 0 2px 4px rgba(0,0,0,0.08), 0 6px 16px rgba(0,0,0,0.06);
}

.initial-input {
  width: 100%;
  padding: var(--space-lg);
  padding-right: 60px;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background: transparent;
  border: none;
  resize: none;
  min-height: 80px;
}

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

.initial-input:focus {
  outline: none;
}

.initial-submit {
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

.initial-submit:hover {
  background: #333333;
  transform: scale(1.05);
}

.initial-submit svg {
  width: 20px;
  height: 20px;
}

.initial-footer {
  position: absolute;
  bottom: var(--space-lg);
  left: 0;
  right: 0;
  text-align: center;
}

.legal-notice {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.legal-notice a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.legal-notice a:hover {
  text-decoration: underline;
}

/* ============================================
   CHAT VIEW - SPLIT PANELS
   ============================================ */
.chat-view {
  display: flex;
  height: 100vh;
  background: var(--color-bg);
}

.left-panel,
.right-panel {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.left-panel {
  background: var(--color-surface);
  width: 33.333%;
  min-width: 200px;
  max-width: 70%;
  flex-shrink: 0;
}

.right-panel {
  background: var(--color-bg);
  flex: 1;
  min-width: 300px;
}

.panel-resizer {
  width: 4px;
  background: var(--color-border);
  cursor: col-resize;
  flex-shrink: 0;
  position: relative;
  transition: background 0.15s;
}

.panel-resizer:hover {
  background: var(--color-text-muted);
}

.panel-resizer::before {
  content: '';
  position: absolute;
  left: -2px;
  right: -2px;
  top: 0;
  bottom: 0;
  cursor: col-resize;
}

/* Search Tabs - Chrome Style */
.search-tabs {
  background: var(--color-bg);
  padding: var(--space-sm) var(--space-sm) 0;
}

.search-tabs.hidden {
  display: none;
}

.tabs-list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  align-items: flex-end;
}

.tab {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  padding-right: var(--space-sm);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  min-height: 36px;
}

.tab:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.tab-active {
  background: var(--color-surface);
  color: var(--color-text);
  z-index: 1;
}

.tab-active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-surface);
}

.tab-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s, color 0.15s;
  flex-shrink: 0;
}

.tab-close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.tab:hover .tab-close,
.tab-active .tab-close {
  opacity: 1;
}

.tab-close svg {
  width: 12px;
  height: 12px;
}

.tab-loading {
  min-width: 140px;
  cursor: default;
}

.tab-loading:hover {
  background: var(--color-bg);
}

.tab-loading .tab-close {
  display: none;
}

.tab-shimmer {
  display: block;
  width: 100%;
  height: 14px;
  background: linear-gradient(90deg, var(--color-border) 25%, #F5F5F5 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite ease-in-out;
  border-radius: 4px;
}

/* Tab bar bottom border */
.search-tabs::after {
  content: '';
  display: block;
  height: 1px;
  background: var(--color-border);
  margin-top: -1px;
}

.panel-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.panel-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   LEFT PANEL - CHAT MESSAGES
   ============================================ */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.message {
  max-width: 85%;
  width: fit-content;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-user {
  align-self: flex-end;
  background: var(--color-accent);
  color: white;
  border-bottom-right-radius: var(--space-xs);
}

.message-agent {
  align-self: flex-start;
  background: var(--color-bg);
  color: var(--color-text);
  border-bottom-left-radius: var(--space-xs);
}

.message-thinking {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

.message-thinking::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1); }
}

.message-step {
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Spinner */
.step-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

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

/* Checkmark for completed steps */
.step-checkmark {
  margin-right: var(--space-xs);
  color: var(--color-text-secondary);
}

/* Shimmer effect for loading text */
.shimmer {
  background: linear-gradient(
    90deg,
    var(--color-text) 0%,
    var(--color-text) 40%,
    var(--color-text-muted) 50%,
    var(--color-text) 60%,
    var(--color-text) 100%
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

.message-error {
  background: #FDECEA;
  color: var(--color-error);
}

.message-system {
  align-self: center;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-style: italic;
  padding: var(--space-sm) var(--space-md);
}

.message-agent-streaming {
  align-self: flex-start;
  background: var(--color-bg);
  color: var(--color-text);
  border-bottom-left-radius: var(--space-xs);
}

.message-content {
  white-space: pre-wrap;
  word-break: break-word;
}

.message-content code {
  background: var(--color-surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.step-complete {
  color: var(--color-success) !important;
  background: #F0F0F0 !important;
}

.step-complete .step-text {
  color: var(--color-success);
}

.ai-json {
  font-size: 0.8rem;
  background: var(--color-surface);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  margin-top: var(--space-sm);
  max-height: 150px;
  overflow-y: auto;
  color: var(--color-text-secondary);
}

/* ============================================
   CHAT INPUT AREA
   ============================================ */
.chat-input-area {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat-form {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
}

.chat-input {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: transparent;
  border: none;
  resize: none;
  max-height: 120px;
}

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

.chat-input:focus {
  outline: none;
}

.chat-submit {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}

.chat-submit:hover {
  background: #333333;
}

.chat-submit:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
}

.chat-submit svg {
  width: 16px;
  height: 16px;
}

/* Stop Button - hidden by default, shown when loading */
.chat-stop {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: var(--color-error);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}

.chat-stop:hover {
  background: #000000;
}

.chat-stop svg {
  width: 18px;
  height: 18px;
}

/* Show stop button, hide submit when loading */
.chat-form.loading .chat-submit {
  display: none;
}

.chat-form.loading .chat-stop {
  display: flex;
}

/* ============================================
   RIGHT PANEL - PARAMS & RESULTS
   ============================================ */
.params-section {
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: none;
}

.params-section.visible {
  display: block;
}

.params-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
}

.param-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 70px;
}

.param-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.param-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

/* ============================================
   RESULTS AREA
   ============================================ */
.results-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
}

.flights-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.empty-state {
  text-align: center;
  padding: var(--space-xl);
  color: var(--color-text-muted);
}

/* Flight Card */
.flight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  animation: fadeIn 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
}

.flight-leg {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-md);
  align-items: start;
}

/* Left: Times and Airline */
.flight-times {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-lg);
}

.flight-time-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.time-range {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-text);
}

.time-range sup {
  font-size: 0.7em;
  color: var(--color-text-muted);
  margin-left: 2px;
}

.flight-airline {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* Airline Icons */
.airline-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  background: var(--color-bg);
}

.airline-icon img {
  object-fit: contain;
}

/* Single airline - full icon */
.airline-icon-single img {
  width: 100%;
  height: 100%;
}

/* Fallback icon */
.airline-icon-fallback img {
  width: 100%;
  height: 100%;
  padding: 4px;
  opacity: 0.6;
}

/* Two airlines - diagonal split (top-left + bottom-right) */
.airline-icon-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.airline-icon-dual .quadrant-tl {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  height: 100%;
}

.airline-icon-dual .quadrant-br {
  grid-column: 2;
  grid-row: 2;
  width: 100%;
  height: 100%;
}

/* Three airlines - TL, TR, BL */
.airline-icon-triple {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.airline-icon-triple .quadrant-tl {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  height: 100%;
}

.airline-icon-triple .quadrant-tr {
  grid-column: 2;
  grid-row: 1;
  width: 100%;
  height: 100%;
}

.airline-icon-triple .quadrant-bl {
  grid-column: 1;
  grid-row: 2;
  width: 100%;
  height: 100%;
}

/* Four airlines - all quadrants */
.airline-icon-quad {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.airline-icon-quad .quadrant-tl {
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  height: 100%;
}

.airline-icon-quad .quadrant-tr {
  grid-column: 2;
  grid-row: 1;
  width: 100%;
  height: 100%;
}

.airline-icon-quad .quadrant-bl {
  grid-column: 1;
  grid-row: 2;
  width: 100%;
  height: 100%;
}

.airline-icon-quad .quadrant-br {
  grid-column: 2;
  grid-row: 2;
  width: 100%;
  height: 100%;
}

/* Right: Stops and Layovers */
.flight-stops {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  align-items: flex-start;
  text-align: left;
}

.stops-count {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.connecting-airports {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* Middle: Duration and Route */
.flight-middle {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  align-items: center;
  text-align: center;
}

.flight-duration {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.flight-route {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}


.flight-price {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
}

.flight-price.price-great-deal {
  color: #16A34A;
}

.flight-price-section {
  position: absolute;
  right: var(--space-lg);
  top: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.flight-select-btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  color: var(--color-text);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s, background 0.15s;
}

.flight-select-btn:hover {
  border-color: var(--color-text);
  background: rgba(0, 0, 0, 0.02);
}

.flight-select-btn:active {
  background: rgba(0, 0, 0, 0.05);
}

/* ============================================
   SKELETON LOADING
   ============================================ */
.skeleton-text {
  display: inline-block;
  width: 60px;
  height: 16px;
  background: linear-gradient(90deg, #E8EAED 25%, #F5F5F5 50%, #E8EAED 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite ease-in-out;
  border-radius: 4px;
}

.skeleton-flight {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}

.skeleton-flight .skeleton-text {
  background: linear-gradient(90deg, #E8EAED 25%, #F5F5F5 50%, #E8EAED 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite ease-in-out;
  border-radius: 4px;
}

.skeleton-flight .skeleton-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: linear-gradient(90deg, #E8EAED 25%, #F5F5F5 50%, #E8EAED 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite ease-in-out;
  flex-shrink: 0;
}

.skeleton-flight .flight-times {
  gap: var(--space-lg);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.param-item.skeleton .param-value {
  color: transparent;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .chat-view {
    flex-direction: column;
  }
  
  .left-panel,
  .right-panel {
    flex: none;
    height: 50vh;
    border-right: none;
  }
  
  .left-panel {
    border-bottom: 1px solid var(--color-border);
  }
}