:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --green: #3fb950;
  --red: #f85149;
  --yellow: #d29922;
  --purple: #bc8cff;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}
a { color: var(--accent); text-decoration: none; }

/* Loading bar */
.loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  z-index: 9999;
  transition: width 0.3s ease;
  display: none;
}
.loading-bar.active {
  display: block;
  animation: loading-progress 1.5s ease-in-out infinite;
}
@keyframes loading-progress {
  0% { width: 0; left: 0; }
  50% { width: 60%; left: 20%; }
  100% { width: 0; left: 100%; }
}

/* Layout */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header h1 { font-size: 18px; font-weight: 600; white-space: nowrap; }
.header-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; flex: 1; }

/* Filters */
.filter-group { display: flex; align-items: center; gap: 6px; }
.filter-group label { color: var(--text-secondary); font-size: 12px; white-space: nowrap; }
.filter-group select, .filter-group input[type="date"] {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 13px;
}
.filter-group select:focus, .filter-group input:focus { border-color: var(--accent); outline: none; }
.preset-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
}
.preset-btn:hover { border-color: var(--accent); color: var(--text-primary); }
.preset-btn.active { background: var(--accent); color: #000; border-color: var(--accent); }

/* Tabs */
.tabs {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  gap: 0;
  overflow-x: auto;
}
.tabs[role="navigation"] { /* specificity anchor */ }
.tab {
  padding: 10px 20px;
  cursor: pointer;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  font-size: 13px;
  font-weight: 500;
}
.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { display: none; padding: 20px 24px; }
.tab-content.active { display: block; }

/* Cards & Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.stat-card .label { color: var(--text-secondary); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.stat-card .value { font-size: 20px; font-weight: 600; font-variant-numeric: tabular-nums; }
.stat-card .sub { color: var(--text-muted); font-size: 11px; margin-top: 2px; }
.positive { color: var(--green); }
.negative { color: var(--red); }
.neutral { color: var(--text-primary); }

/* Charts */
.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
}
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.chart-header h3 { font-size: 15px; font-weight: 600; }
.chart-toggles { display: flex; gap: 8px; flex-wrap: wrap; }
.toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 3px 10px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 11px;
}
.toggle-btn.active { background: var(--accent); color: #000; border-color: var(--accent); }
.toggle-btn.active-green { background: var(--green); color: #000; border-color: var(--green); }
.toggle-btn.active-red { background: var(--red); color: #000; border-color: var(--red); }

/* Tables */
.table-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: auto;
  margin-bottom: 20px;
}
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  background: var(--bg-tertiary);
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}
th:hover { color: var(--text-primary); }
th .sort-arrow { margin-left: 4px; opacity: 0.5; }
td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
tr:hover { background: rgba(88,166,255,0.04); }
.clickable-row { cursor: pointer; }
.clickable-row:hover { background: rgba(88,166,255,0.08); }
td.num { text-align: right; }
th.num { text-align: right; }

/* Upload */
.upload-area {
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 40px;
  text-align: center;
  margin-bottom: 20px;
  cursor: pointer;
}
.upload-area:hover { border-color: var(--accent); }
.upload-area input { display: none; }
.upload-result {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-top: 12px;
}

/* Symbol multi-select */
.symbol-filter-container { position: relative; }
.symbol-filter-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  min-width: 120px;
  text-align: left;
}
.symbol-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  z-index: 200;
  max-height: 300px;
  overflow-y: auto;
  min-width: 200px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.symbol-dropdown.open { display: block; }
.symbol-dropdown input[type="text"] {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
  font-size: 13px;
}
.symbol-option {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 13px;
}
.symbol-option:hover { background: var(--bg-tertiary); }
.symbol-clear-btn {
  color: var(--accent);
  cursor: pointer;
  padding: 4px 6px;
  font-size: 12px;
}

/* Loading */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}
.loading::after {
  content: '';
  display: inline-block;
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 10px;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Two-column layout */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.section-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive breakpoints */
@media (max-width: 480px) {
  .header { flex-direction: column; align-items: flex-start; padding: 8px 12px; }
  .header h1 { font-size: 15px; }
  .stats-grid { grid-template-columns: 1fr; }
  .tab { padding: 8px 12px; font-size: 12px; }
  .tab-content { padding: 12px; }
}

@media (max-width: 768px) {
  .header { flex-direction: column; align-items: flex-start; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
}

@media (min-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1200px) { .two-col { grid-template-columns: 1fr; } }

@media (min-width: 1600px) {
  .stats-grid { grid-template-columns: repeat(6, 1fr); }
}