:root {
  --bg: #0d1117;
  --bg-surface: rgba(22, 27, 34, 0.95);
  --bg-elevated: rgba(33, 38, 45, 0.95);
  --border: rgba(48, 54, 61, 0.8);
  --text: #8b949e;
  --text-bright: #e6edf3;
  --text-dim: #484f58;
  --accent: #a78bfa;
  --font: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
  --font-ui: system-ui, -apple-system, sans-serif;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 1fr auto;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 30%, rgba(167, 139, 250, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 70%, rgba(244, 114, 182, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

::selection {
  background: var(--accent);
  color: #000;
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
}

/* ─── Loading Overlay ─── */

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
}

.loading-overlay__content {
  text-align: center;
  max-width: 400px;
}

.loading-overlay__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.loading-overlay__title {
  font-family: var(--font);
  font-size: 1.1rem;
  color: var(--text-bright);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.loading-overlay__bar-track {
  width: 300px;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  margin: 0 auto 1rem;
  overflow: hidden;
}

.loading-overlay__bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #f472b6);
  border-radius: 2px;
  transition: width 0.3s ease;
  width: 0%;
}

.loading-overlay__text {
  font-size: 0.8rem;
  color: var(--text);
}

.loading-overlay__hint {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
}

/* ─── Tooltip ─── */

.tooltip {
  position: fixed;
  z-index: 500;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-bright);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-family: var(--font);
  pointer-events: none;
  max-width: 320px;
  white-space: normal;
  line-height: 1.6;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.tooltip b {
  color: var(--text-bright);
  font-weight: 600;
}

#heatmap-tooltip {
  z-index: 700;
}

/* ─── Modal ─── */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 600;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-overlay[hidden] {
  display: none;
}

.tooltip[hidden] {
  display: none;
}

.loading-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 440px;
  width: 90%;
}

.modal__header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.modal__title {
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text-bright);
  font-weight: 600;
}

.modal__badge {
  font-size: 0.7rem;
  color: var(--text);
  background: rgba(255,255,255,0.06);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.modal__close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

.modal__close:hover {
  color: var(--text-bright);
}

.modal__heatmap {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  image-rendering: pixelated;
  cursor: crosshair;
}

.modal__info {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  font-size: 0.78rem;
  color: var(--text);
  background: rgba(255,255,255,0.03);
  padding: 0.75rem;
  border-radius: 8px;
  line-height: 1.5;
}

.modal__info span {
  flex-shrink: 0;
}

/* ─── Badge ─── */

.badge {
  font-size: 0.7rem;
  color: var(--text);
  background: rgba(255,255,255,0.06);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-family: var(--font);
}