:root {
  --accent: #2196F3;
  --bg: #f0f0f0;
  --card: #fff;
  --text: #444444;
}

body.dark-mode {
  --accent: #64b5f6;
  --bg: #0d1117;
  --card: #161b22;
  --text: #e6edf3;
  --border: #444;
}

body {
  background: var(--bg);
  color: var(--text);
}

html, body {
  height: 100%;
  margin: 0;
  font-family: Arial, sans-serif;
}

header {
  background: var(--border);
  color: var(--accent);
  padding: 2px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toggle-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

section {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.6s ease, opacity 0.6s ease;
}

section.active {
  max-height: 2400px;
  opacity: 1;
  padding: 20px 16px 40px;
}

.card {
  background: var(--card);
  border-radius: 10px;
  padding: 18px;
  max-width: 1000px;
  margin: 0 auto;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}

canvas {
  border: 2px solid #333;
  border-radius: 8px;
  background: var(--card);
  display: block;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  height: 100%;
}

.desc {
  background: var(--bg);
  border-left: 4px solid var(--accent);
  padding: 12px;
  border-radius: 2px;
}

.controls {
  margin-top: 12px;
}

.controls input[type=range] {
  width: 68%;
  margin-top: 8px;
}

.panel {
  background: var(--bg);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  display: flex;
  gap: 12px;
  padding: 12px;
}

.panel > div:first-child {
  flex: 1;
  min-width: 0;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
}

.control-group label {
  min-width: 90px;
  font-weight: 500;
}

.control-group input[type=range] {
  flex: 1;
  min-width: 200px;
}

.control-group select {
  flex: 1;
  padding: 4px;
}

.value {
  width: 56px;
  text-align: center;
  font-family: monospace;
  flex-shrink: 0;
}

.muted {
  width: 56px;
  text-align: right;
  font-family: monospace;
}

.displayProperties {
  flex-shrink: 0;
  width: auto;
  min-width: 150px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.displayProperties table {
  width: 100%;
}

.displayProperties td {
  padding: 4px;
}

pre#resultsContent {
  background: var(--bg);
  padding: 10px;
  border-radius: 6px;
  white-space: pre-wrap;
  font-family: monospace;
  font-size: 13px;
  margin: 8px 0;
}

#formulaPanel {
  position: fixed;
  right: 8px;
  top: 15%;
  width: 30%;
  max-width: 400px;
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  z-index: 1200;
  overflow: hidden;
  max-height: 90vh;
}

#formulaPanel.slim {
  width: 100px;
}

#formulaPanel.slim #formulaBody {
  display: none;
}

#formulaHeader {
  background: var(--accent);
  color: #fff;
  padding: 8px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: grab;
  user-select: none;
}

#formulaHeader .title {
  font-weight: 700;
  font-size: 13px;
}

#formulaHeader .chev {
  cursor: pointer;
  font-size: 14px;
}

#formulaBody {
  padding: 4px;
  font-size: 12px;
}

#mathBlock {
  max-height: 10%;
  overflow: hidden;
  transition: max-height 0.1s;
}

#mathBlock.collapsed {
  max-height: 0;
}
#mathBlock svg {
  height: 34px;
}