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

:root {
  --teal: #0d9488;
  --teal-light: #ccfbf1;
  --teal-dark: #0f766e;
  --coral: #dc2626;
  --coral-light: #fee2e2;
  --green: #16a34a;
  --green-light: #dcfce7;
  --amber: #d97706;
  --amber-light: #fef3c7;
  
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  
  --radius: 8px;
  --radius-lg: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  padding: 1.5rem;
}

.hidden {
  display: none !important;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Header */
.header {
  background: var(--teal);
  color: white;
  padding: 1.5rem 2rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.header-copy {
  flex: 1;
  min-width: 0;
}

.header-icon {
  font-size: 2.5rem;
  background: rgba(255,255,255,0.2);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  flex-shrink: 0;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.header p {
  font-size: 0.95rem;
  opacity: 0.95;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.14);
  color: white;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.15s;
  flex-shrink: 0;
}

.github-link:hover {
  background: white;
  color: var(--teal-dark);
}

.github-arrow {
  font-size: 0.85rem;
}

/* Metrics */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  position: relative;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-600);
  margin-bottom: 0.5rem;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

.metric-card.status-ongoing .metric-value { color: var(--amber); }
.metric-card.status-accepted .metric-value { color: var(--green); }
.metric-card.status-walked .metric-value { color: var(--coral); }

.product-info-btn {
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  width: auto;
  padding: 0.45rem 0.7rem;
  border: 1.5px solid var(--teal);
  border-radius: var(--radius);
  background: var(--teal-light);
  color: var(--teal-dark);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.product-info-btn:hover:not(:disabled) {
  background: var(--teal);
  color: white;
}

.product-info-btn:disabled {
  border-color: var(--gray-200);
  background: var(--gray-100);
  color: var(--gray-400);
  cursor: not-allowed;
}

.reward-info-btn {
  margin-top: 0;
}

.reward-value.reward-positive {
  color: var(--green);
}

.reward-value.reward-negative {
  color: var(--coral);
}

.reward-value.reward-neutral {
  color: var(--gray-900);
}

/* Controls */
.controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.select {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  background: white;
  color: var(--gray-900);
  cursor: pointer;
}

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

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--teal);
  color: white;
  width: 100%;
  padding: 1rem;
  font-size: 1rem;
  margin-top: 0.75rem;
}

.btn-primary:hover {
  background: var(--teal-dark);
}

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.btn:disabled,
.action-btn:disabled,
.offer-ok:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Main Layout */
.main-layout {
  display: block;
  margin-bottom: 1.5rem;
}

/* Sidebar */
.sidebar {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-600);
  margin-bottom: 1rem;
}

.action-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius);
  background: white;
  cursor: pointer;
  margin-bottom: 0.75rem;
  transition: all 0.15s;
  text-align: left;
}

.response-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.response-actions .action-btn {
  position: relative;
  justify-content: center;
  margin-bottom: 0;
  padding: 0.75rem 0.9rem;
  font-weight: 700;
  text-align: center;
}

.response-actions .action-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  width: min(240px, 80vw);
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius);
  background: var(--gray-900);
  color: white;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.35;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(4px);
  transition: opacity 0.15s, transform 0.15s;
  z-index: 5;
}

.response-actions .action-btn[data-tooltip]:hover::after,
.response-actions .action-btn[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.response-actions .action-icon {
  width: 30px;
  height: 30px;
  font-size: 1rem;
}

.action-btn:hover {
  border-color: var(--teal);
  background: var(--teal-light);
}

.action-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
}

.action-offer .action-icon {
  background: var(--teal-light);
  color: var(--teal-dark);
}

.action-custom .action-icon {
  background: var(--amber-light);
  color: var(--amber);
}

.action-accept .action-icon {
  background: var(--green-light);
  color: var(--green);
}

.action-walk .action-icon {
  background: var(--coral-light);
  color: var(--coral);
}

.action-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-900);
}

.action-sub {
  font-size: 0.85rem;
  color: var(--gray-600);
}

.offer-input-row {
  display: none;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.625rem;
  background: var(--teal-light);
  border: 1.5px solid var(--teal);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
}

.offer-input-row.open {
  display: grid;
}

.dollar-sign {
  font-size: 1rem;
  font-weight: 700;
  color: var(--teal-dark);
  flex-shrink: 0;
}

#offer-amount {
  width: 100%;
  min-width: 0;
  border: none;
  background: transparent;
  font-size: 1rem;
  font-weight: 600;
  color: var(--teal-dark);
  outline: none;
}

#offer-amount::placeholder {
  color: rgba(15, 118, 110, 0.4);
}

.offer-ok {
  flex-shrink: 0;
  background: var(--teal);
  color: white;
  border: none;
  padding: 0.45rem 0.7rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.offer-ok:hover {
  background: var(--teal-dark);
}

/* Content */
.content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-panel {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.chat-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--gray-200);
  background: var(--gray-50);
}

.chat-header h2 {
  font-size: 1.05rem;
  line-height: 1.25;
  color: var(--gray-900);
}

.chat-card {
  padding: 1.25rem;
  min-height: 380px;
  max-height: 620px;
  overflow-y: auto;
}

.chat-card:empty::before {
  content: 'No messages yet.';
  color: var(--gray-400);
  font-style: italic;
}

.chat-product-card {
  width: 100%;
  margin-bottom: 1.25rem;
  padding: 1rem 1.125rem;
  border: 1px solid var(--teal-light);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(204, 251, 241, 0.78), white);
  color: var(--gray-800);
}

.chat-product-label {
  margin-bottom: 0.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--teal-dark);
}

.chat-product-title {
  margin-bottom: 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
}

.chat-product-card p {
  font-size: 0.92rem;
  line-height: 1.6;
  text-align: justify;
}

/* Chat Bubbles */
.message-row {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  align-items: flex-end;
}

.message-row.seller {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.message-row.seller .message-avatar {
  background: var(--teal-light);
  color: var(--teal-dark);
}

.message-row.buyer .message-avatar {
  background: var(--amber-light);
  color: var(--amber);
}

.message-bubble {
  max-width: 70%;
  padding: 0.875rem 1.125rem;
  border-radius: 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.message-row.seller .message-bubble {
  background: var(--gray-100);
  color: var(--gray-900);
  border-bottom-right-radius: 0.25rem;
}

.message-row.buyer .message-bubble {
  background: var(--teal);
  color: white;
  border-bottom-left-radius: 0.25rem;
}

/* Input Group */
.input-group {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-600);
  margin-bottom: 0.75rem;
}

#buyer-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--gray-900);
  resize: vertical;
}

#buyer-input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px var(--teal-light);
}

/* Product Info Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: rgba(23, 23, 23, 0.52);
  backdrop-filter: blur(4px);
  z-index: 50;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  width: min(900px, 100%);
  max-height: min(760px, 90vh);
  display: flex;
  flex-direction: column;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 80px rgba(23, 23, 23, 0.24);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  color: white;
}

.modal-header .metric-label {
  color: rgba(255, 255, 255, 0.78);
}

.modal-header h2 {
  font-size: 1.35rem;
  line-height: 1.2;
}

.modal-close {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  color: white;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all 0.15s;
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.28);
}

.product-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.product-summary-item {
  padding: 0.8rem;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
}

.product-summary-item span {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray-600);
}

.product-summary-item strong {
  display: block;
  color: var(--gray-900);
  font-size: 0.95rem;
  line-height: 1.35;
  word-break: break-word;
}

.product-summary-item.reward-positive strong {
  color: var(--green);
}

.product-summary-item.reward-negative strong {
  color: var(--coral);
}

.product-summary-item.reward-neutral strong {
  color: var(--gray-900);
}

.product-info-content {
  padding: 1.25rem 1.5rem;
  background: white;
  overflow: auto;
}

.info-group {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 0.85rem;
  overflow: hidden;
}

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

.info-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  background: var(--gray-50);
  color: var(--gray-900);
  cursor: pointer;
  list-style: none;
}

.info-group summary::-webkit-details-marker {
  display: none;
}

.info-group summary::after {
  content: '+';
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--teal-light);
  color: var(--teal-dark);
  font-weight: 700;
  flex-shrink: 0;
}

.info-group[open] summary::after {
  content: '−';
}

.info-group summary span {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
}

.info-group summary small {
  display: block;
  margin-top: 0.15rem;
  color: var(--gray-600);
  font-size: 0.8rem;
  font-weight: 500;
}

.info-group-body {
  padding: 1rem;
  border-top: 1px solid var(--gray-200);
}

.info-group-body h3 {
  margin: 1rem 0 0.5rem;
  font-size: 0.85rem;
  color: var(--teal-dark);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.info-table tr {
  border-bottom: 1px solid var(--gray-100);
}

.info-table tr:last-child {
  border-bottom: none;
}

.info-table th,
.info-table td {
  padding: 0.65rem 0.5rem;
  vertical-align: top;
}

.info-table th {
  width: 32%;
  color: var(--gray-600);
  font-weight: 700;
  text-align: left;
}

.info-table td {
  color: var(--gray-900);
  line-height: 1.45;
  word-break: break-word;
}

.info-text-block {
  margin-top: 1rem;
  padding: 0.9rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--gray-50);
}

.info-text-block h4 {
  margin-bottom: 0.4rem;
  color: var(--teal-dark);
  font-size: 0.85rem;
}

.info-text-block p {
  white-space: pre-wrap;
  color: var(--gray-800);
  font-size: 0.86rem;
  line-height: 1.55;
}

.empty-info {
  color: var(--gray-600);
}

.reward-component {
  padding: 1rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 0.85rem;
  background: white;
}

.reward-component:last-child {
  margin-bottom: 0;
}

.reward-component.reward-positive {
  border-left: 4px solid var(--green);
}

.reward-component.reward-negative {
  border-left: 4px solid var(--coral);
}

.reward-component.reward-neutral {
  border-left: 4px solid var(--gray-300);
}

.reward-component-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.reward-component-header h3 {
  margin-bottom: 0.2rem;
  font-size: 0.95rem;
  color: var(--gray-900);
}

.reward-component-header p {
  color: var(--gray-600);
  font-size: 0.85rem;
}

.reward-component-header strong {
  flex-shrink: 0;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.reward-component.reward-positive .reward-component-header strong {
  color: var(--green);
}

.reward-component.reward-negative .reward-component-header strong {
  color: var(--coral);
}

.reward-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.reward-metric-item {
  padding: 0.7rem;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--gray-50);
}

.reward-metric-item span {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray-600);
}

.reward-metric-item strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

/* Responsive */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .response-actions {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-summary {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  body {
    padding: 1rem;
  }

  .header {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .github-link {
    width: 100%;
    justify-content: center;
  }

  .metrics,
  .response-actions,
  .product-summary {
    grid-template-columns: 1fr;
  }

  .reward-metric-grid {
    grid-template-columns: 1fr;
  }

  .modal-backdrop {
    padding: 0.75rem;
  }
}