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

:root {
  --bg-primary: #1a1d29;
  --bg-secondary: #232838;
  --bg-tertiary: #2a2f42;
  --border-color: #3a4055;
  --text-primary: #e4e6eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent-blue: #4a90e2;
  --accent-blue-hover: #5aa0f2;
  --accent-green: #7cb342;
  --accent-red: #e74c3c;
  --shadow: rgba(0, 0, 0, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 8px;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-radius: 20px;
  font-size: 0.875rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-badge.processing .status-dot {
  background: var(--accent-blue);
  animation: pulse 2s infinite;
}

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

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

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

/* Calculate Button */
.calculate-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-blue);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-bottom: 1.5rem;
}

.calculate-btn:hover {
  background: var(--accent-blue-hover);
}

.calculate-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Content Grid */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 1.5rem;
}

@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}

/* Panel */
.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
}

.clear-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.clear-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Execution Log */
.execution-log-panel {
  max-height: 600px;
  display: flex;
  flex-direction: column;
}

.log-content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  max-height: 540px;
}

.log-entry {
  display: flex;
  gap: 0.75rem;
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  border-radius: 6px;
  font-size: 0.875rem;
  line-height: 1.5;
}

.log-entry:hover {
  background: var(--bg-tertiary);
}

.log-time {
  color: var(--text-muted);
  font-family: 'Courier New', monospace;
  white-space: nowrap;
}

.log-icon {
  flex-shrink: 0;
}

.log-message {
  color: var(--text-secondary);
  flex: 1;
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
}

.tab-btn {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
}

/* Buyer Type Filter */
.buyer-type-filter {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.buyer-type-filter label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.buyer-type-filter select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
}

.buyer-type-filter select:focus {
  border-color: var(--accent-blue);
}

/* Products Content */
.products-content {
  padding: 1.5rem;
  min-height: 400px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.empty-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Products Table */
.products-table {
  width: 100%;
  border-collapse: collapse;
}

.products-table thead th {
  text-align: left;
  padding: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-color);
}

.products-table tbody tr {
  border-bottom: 1px solid var(--border-color);
  transition: background 0.2s;
}

.products-table tbody tr:hover {
  background: var(--bg-tertiary);
}

.products-table tbody td {
  padding: 1rem 0.75rem;
  font-size: 0.875rem;
}

.product-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.product-image {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--bg-tertiary);
}

.product-name {
  font-weight: 500;
  color: var(--text-primary);
}

.pps-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.875rem;
}

.pps-badge.high {
  background: rgba(124, 179, 66, 0.2);
  color: var(--accent-green);
}

.pps-badge.medium {
  background: rgba(74, 144, 226, 0.2);
  color: var(--accent-blue);
}

.pps-badge.low {
  background: rgba(231, 76, 60, 0.2);
  color: var(--accent-red);
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.tag {
  padding: 0.125rem 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Loading State */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}