/* Reset and base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0f1419;
  --bg-secondary: #1a1f26;
  --bg-card: #242b33;
  --text-primary: #e7e9ea;
  --text-secondary: #8b98a5;
  --accent: #1d9bf0;
  --accent-hover: #1a8cd8;
  --success: #00ba7c;
  --error: #f4212e;
  --border: #2f3336;
}

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

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: 12px;
  max-width: 400px;
  width: 90%;
}

.modal-content h2 {
  margin-bottom: 0.5rem;
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.modal-content input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.modal-content button {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
}

.modal-content button:hover {
  background: var(--accent-hover);
}

.error {
  color: var(--error);
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

/* Error Banner */
.error-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--error);
  color: white;
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 999;
}

.error-banner.hidden {
  display: none;
}

.error-banner button {
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Header */
header {
  background: var(--bg-secondary);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.header-controls span {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.header-controls select,
.header-controls button {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  cursor: pointer;
}

.header-controls select {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.header-controls button {
  background: var(--accent);
  color: white;
  border: none;
}

.header-controls button:hover {
  background: var(--accent-hover);
}

#logout-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

#logout-btn:hover {
  border-color: var(--error);
  color: var(--error);
}

/* Main content */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

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

.section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* Metric Cards */
.card-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.metric-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  text-align: center;
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

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

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

.chart-row.three-col {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 1024px) {
  .chart-row.three-col {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .chart-row,
  .chart-row.three-col {
    grid-template-columns: 1fr;
  }
}

.chart-container {
  background: var(--bg-card);
  padding: 1rem;
  border-radius: 12px;
}

.chart-container h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.chart-wrapper {
  position: relative;
  height: 250px;
}

.chart-loading,
.chart-error,
.table-loading,
.table-error {
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

.chart-error,
.table-error {
  color: var(--error);
}

/* Table */
.table-container {
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
}

table {
  width: 100%;
  border-collapse: collapse;
}

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

th {
  background: var(--bg-secondary);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

th:hover {
  background: var(--bg-primary);
}

tbody tr:hover {
  background: var(--bg-secondary);
}

/* Utility */
.hidden {
  display: none !important;
}

/* Loading state */
.loading .metric-value {
  color: var(--text-secondary);
}

/* Sort indicators */
th.sort-asc::after {
  content: ' ▲';
  font-size: 0.75em;
}

th.sort-desc::after {
  content: ' ▼';
  font-size: 0.75em;
}

/* Tab Navigation */
.tab-nav {
  display: flex;
  gap: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}

.tab-btn {
  padding: 1rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

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

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Tab Content */
.tab-content {
  display: block;
}

.tab-content.hidden {
  display: none;
}

/* No Data Message */
.no-data {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
  font-size: 1.1rem;
}