/* ═══════════════════════════════════════════════════════════════════════════
   base.css — Reset, layout grid, CSS variables, shared structural styles.
   Theme-specific overrides go in /css/themes/*.css
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; -webkit-font-smoothing: antialiased; }
body { min-height: 100vh; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; }
button, select, input { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ── CSS Custom Properties (defaults — overridden by themes) ────────── */
:root {
  /* Surfaces */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2035;
  --bg-card: #151d2e;
  --bg-hover: rgba(255,255,255,0.04);

  /* Text */
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent & Semantic */
  --color-accent: #ff6600;
  --color-positive: #22c55e;
  --color-negative: #ef4444;
  --color-warning: #f59e0b;
  --color-neutral: #6b7280;

  /* Growth heatmap scale */
  --heatmap-100: #059669;
  --heatmap-50: #10b981;
  --heatmap-35: #34d399;
  --heatmap-25: #fbbf24;
  --heatmap-10: #f59e0b;
  --heatmap-0: #fb923c;
  --heatmap-neg: #ef4444;
  --heatmap-text-light: #fff;
  --heatmap-text-dark: #1a1a1a;

  /* Growth tier */
  --color-growth-hot: #059669;
  --color-growth-strong: #10b981;
  --color-growth-moderate: #fbbf24;
  --color-growth-slow: #f59e0b;
  --color-growth-negative: #ef4444;

  /* Chart */
  --chart-grid: rgba(255,255,255,0.06);

  /* Typography */
  --font-heading: system-ui, -apple-system, sans-serif;
  --font-body: system-ui, -apple-system, sans-serif;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  --font-numbers: var(--font-mono);

  /* Spacing & Borders */
  --border-color: rgba(255,255,255,0.08);
  --border-radius: 6px;
  --card-shadow: none;
  --gap: 16px;
  --gap-sm: 8px;
  --gap-lg: 24px;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-normal: 200ms ease;
}

/* ── Body ────────────────────────────────────────────────────────────── */
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.5;
}

/* ── Header / Navigation ─────────────────────────────────────────────── */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gap-lg);
  height: 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--gap);
}

.app-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

.header-meta {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.header-nav {
  display: flex;
  gap: 2px;
}

.nav-link {
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

#theme-selector {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 4px 8px;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
}

#refresh-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 4px 8px;
  font-size: 16px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

#refresh-btn:hover {
  color: var(--color-accent);
}

/* ── Main Content ────────────────────────────────────────────────────── */
#dashboard-content {
  padding: var(--gap-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.dashboard { display: flex; flex-direction: column; gap: var(--gap-lg); }

/* ── Sections ────────────────────────────────────────────────────────── */
.section {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-bottom: var(--gap-sm);
  border-bottom: 1px solid var(--border-color);
}

.section-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: -8px;
}

/* ── Loading / Error / Empty States ──────────────────────────────────── */
.loading-state, .error-state, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: 13px;
}

.loading-spinner {
  width: 24px; height: 24px;
  border: 2px solid var(--border-color);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

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

.error-state { color: var(--color-negative); }

/* ── Chart Containers ────────────────────────────────────────────────── */
.chart-container {
  position: relative;
  height: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--gap);
}

.chart-container.chart-tall { height: 360px; }

.chart-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

/* ── Filter Bar ──────────────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  padding: var(--gap) var(--gap-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 12px;
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.filter-item select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 3px 6px;
  color: var(--text-primary);
  font-size: 12px;
}

.filter-item input[type="checkbox"] {
  accent-color: var(--color-accent);
}

/* ── Selector Bar (Deep Dive) ────────────────────────────────────────── */
.selector-bar {
  padding: var(--gap);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.stock-selector-label {
  display: flex;
  align-items: center;
  gap: var(--gap);
  font-size: 13px;
  color: var(--text-secondary);
}

.stock-selector-label select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 6px 12px;
  color: var(--text-primary);
  font-size: 13px;
  min-width: 300px;
}

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .chart-row { grid-template-columns: 1fr; }
  .top-performers-grid { grid-template-columns: 1fr 1fr; }
  .thesis-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  #app-header { flex-wrap: wrap; height: auto; padding: var(--gap-sm); }
  .header-nav { order: 3; width: 100%; overflow-x: auto; }
  .nav-link { padding: 8px 12px; font-size: 11px; }
  #dashboard-content { padding: var(--gap); }
  .top-performers-grid { grid-template-columns: 1fr; }
}