/* CSS Variables */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #64748b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  --color-bg: #f8fafc;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition: 150ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; margin-bottom: 1rem; }
h3 { font-size: 1rem; margin-bottom: 0.75rem; color: var(--color-text-secondary); }

/* Layout */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main {
  flex: 1;
  padding: 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.header-left h1 {
  font-size: 1.25rem;
}

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

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1rem;
  padding-left: 1rem;
  border-left: 1px solid var(--color-border);
}

#user-email {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

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

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

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

.btn-text {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.875rem;
  padding: 0.25rem 0.5rem;
}

.btn-text:hover {
  text-decoration: underline;
}

/* Form Elements */
.select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%2364748b' d='M4 6l4 4 4-4'/%3E%3C/svg%3E") no-repeat right 0.5rem center;
  appearance: none;
  cursor: pointer;
}

.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

/* Cards */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

/* Sections */
.section {
  margin-bottom: 2rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.section h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section h2 svg {
  color: var(--color-primary);
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

/* Summary Cards */
.summary-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.summary-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.summary-card-title {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.summary-card-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.summary-card-icon.blue { background: #dbeafe; color: #2563eb; }
.summary-card-icon.green { background: #d1fae5; color: #10b981; }
.summary-card-icon.purple { background: #ede9fe; color: #7c3aed; }
.summary-card-icon.orange { background: #ffedd5; color: #f97316; }
.summary-card-icon.pink { background: #fce7f3; color: #ec4899; }

.summary-card-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.summary-card-change {
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.summary-card-change.positive { color: var(--color-success); }
.summary-card-change.negative { color: var(--color-danger); }
.summary-card-change.neutral { color: var(--color-text-muted); }

/* Insights Cards */
.insight-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  border-left: 4px solid;
}

.insight-card.positive { border-left-color: var(--color-success); }
.insight-card.negative { border-left-color: var(--color-danger); }
.insight-card.neutral { border-left-color: var(--color-secondary); }

.insight-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.insight-card-category {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.insight-card-impact {
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

.insight-card-impact.high { background: #fef2f2; color: var(--color-danger); }
.insight-card-impact.medium { background: #fffbeb; color: var(--color-warning); }
.insight-card-impact.low { background: #f0fdf4; color: var(--color-success); }

.insight-card-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.insight-card-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Recommendation Cards */
.recommendation-card {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border-radius: var(--radius-lg);
  padding: 1rem;
  border: 1px solid #bae6fd;
}

.recommendation-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.recommendation-priority {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

.recommendation-priority.high { background: var(--color-danger); color: white; }
.recommendation-priority.medium { background: var(--color-warning); color: white; }
.recommendation-priority.low { background: var(--color-success); color: white; }

.recommendation-action {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.recommendation-outcome {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Anomaly Cards */
.anomaly-card {
  background: #fef2f2;
  border-radius: var(--radius-lg);
  padding: 1rem;
  border: 1px solid #fecaca;
  display: flex;
  gap: 0.75rem;
}

.anomaly-icon {
  flex-shrink: 0;
  color: var(--color-danger);
}

.anomaly-content {
  flex: 1;
}

.anomaly-metric {
  font-weight: 600;
  color: var(--color-danger);
}

.anomaly-description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Data Lists */
.data-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.data-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.data-list-item:last-child {
  border-bottom: none;
}

.data-list-label {
  font-size: 0.875rem;
  color: var(--color-text);
  max-width: 70%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.data-list-value {
  font-weight: 600;
  font-size: 0.875rem;
}

/* Progress Bars */
.progress-bar-container {
  width: 100%;
}

.progress-bar-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.progress-bar-label {
  font-size: 0.875rem;
}

.progress-bar-value {
  font-size: 0.875rem;
  font-weight: 500;
}

.progress-bar {
  height: 8px;
  background: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* Loading States */
.loading-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem;
  gap: 1rem;
}

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

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

/* Error States */
.error-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4rem;
  gap: 1rem;
  text-align: center;
  color: var(--color-danger);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.data-table tr:hover {
  background: var(--color-bg);
}

/* Footer */
.footer {
  padding: 1rem 1.5rem;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 1200px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .header-right {
    flex-wrap: wrap;
    justify-content: center;
  }

  .user-menu {
    width: 100%;
    justify-content: center;
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

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

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

  .main {
    padding: 1rem;
  }

  .footer {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .summary-grid {
    grid-template-columns: 1fr;
  }
}

/* Chart Container */
canvas {
  max-height: 300px;
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--color-bg) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

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

/* Tooltips */
[data-tooltip] {
  position: relative;
}

[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 0.75rem;
  background: var(--color-text);
  color: white;
  font-size: 0.75rem;
  border-radius: var(--radius-md);
  white-space: nowrap;
  z-index: 1000;
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .btn,
  .select {
    display: none !important;
  }

  .main {
    padding: 0;
  }

  .card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}