.math-widget {
  --math-grid: #e5e5e5;
  --math-axis: #a8a29e;
  --math-curve: #9a6b2e;
  --math-vertex: #4a6b4a;
  --math-root: #2563eb;
  --math-canvas-bg: #ffffff;

  padding: 28px;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  background: var(--card-bg);
  box-shadow: 0 10px 32px var(--shadow-soft);
}

[data-theme="dark"] .math-widget {
  --math-grid: #3a3834;
  --math-axis: #8f8a80;
  --math-curve: #c4924a;
  --math-vertex: #84cc16;
  --math-root: #60a5fa;
  --math-canvas-bg: #242120;
}

.math-widget__title {
  margin: 0 0 20px;
  padding-bottom: 12px;
  font-size: 1.35rem;
  border-bottom: 1px solid var(--line);
}

.math-widget__layout {
  display: grid;
  gap: 28px;
}

.math-widget__equation-box {
  margin-bottom: 20px;
  padding: 16px;
  text-align: center;
  border-radius: 10px;
  background: rgba(154, 107, 46, 0.06);
}

.math-widget__equation-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.math-widget__equation {
  font-size: 1.1rem;
}

.math-widget__equation .katex {
  font-size: 1.15em;
}

.math-widget__controls {
  min-width: 0;
}

.math-slider-row {
  margin-bottom: 16px;
}

.math-slider-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--soft-ink);
}

.math-slider-value {
  font-family: var(--mono);
  color: var(--accent);
  font-weight: 700;
}

.math-slider {
  width: 100%;
}

.math-slider--a {
  accent-color: var(--accent);
}

.math-slider--b {
  accent-color: #4a6b4a;
}

.math-slider--c {
  accent-color: #2563eb;
}

.math-widget__delta-panel {
  margin-top: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(154, 107, 46, 0.05);
}

.math-widget__delta-title {
  margin: 0 0 10px;
  font-size: 1rem;
}

.math-widget__delta-formula {
  margin-bottom: 8px;
  font-size: 1rem;
}

.math-widget__delta-formula--pos .katex {
  color: #16a34a;
}

.math-widget__delta-formula--neg .katex {
  color: #dc2626;
}

.math-widget__delta-nature {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--soft-ink);
}

.math-widget__delta-roots {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.math-widget__graph {
  margin: 0;
  min-width: 0;
}

.math-widget__canvas-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(154, 107, 46, 0.04);
}

.math-widget__canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 4px var(--shadow-soft);
  cursor: crosshair;
  touch-action: none;
}

.math-widget__canvas--active {
  cursor: pointer;
}

.math-graph-tooltip {
  position: absolute;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  box-shadow: 0 6px 18px var(--shadow-soft);
  pointer-events: none;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.35;
  animation: math-tooltip-in 120ms ease-out;
}

@keyframes math-tooltip-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .math-graph-tooltip {
    animation: none;
  }
}

.math-graph-tooltip__label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.math-graph-tooltip__coords {
  font-weight: 700;
  color: var(--ink);
}

.math-graph-tooltip--vertex .math-graph-tooltip__label {
  color: var(--math-vertex);
}

.math-graph-tooltip--root .math-graph-tooltip__label {
  color: var(--math-root);
}

.math-graph-tooltip--curve .math-graph-tooltip__label {
  color: var(--math-curve);
}

.math-widget__caption {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
}

@media (min-width: 768px) {
  .math-widget__layout {
    grid-template-columns: minmax(240px, 1fr) minmax(280px, 1.2fr);
    align-items: start;
  }
}