/* ── Shared base for all visual-explainer pages ── */

:root {
  --bg: #fafaf8;
  --surface: #16213e;
  --text: #2c2c2c;
  --dim: #888;
  --line: rgba(0,0,0,0.08);
  --accent: #e94560;
  --cyan: #0ff0fc;
  --green: #00e676;
  --yellow: #ffd54f;
  --orange: #ff9100;
  --purple: #b388ff;
  --radius-color: #b388ff;
  --code-bg: #ffffff;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem;
  overflow-x: hidden;
}

h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: var(--text);
  margin-bottom: 0.3rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--dim);
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}

.main-layout {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 1100px;
  width: 100%;
}

canvas {
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 1px 4px rgba(0,0,0,0.10);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 280px;
  max-width: 380px;
  flex: 1;
}

.panel {
  background: #fff;
  border-radius: 12px;
  padding: 1.2rem;
  border: 1px solid var(--line);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.panel-title {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--dim);
  margin-bottom: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.value-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.35rem 0;
  font-size: 0.85rem;
}

.value-label { color: var(--dim); }

.value-num {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.code-block {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.75rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
}

.code-block .hl-kw      { color: #c792ea; }
.code-block .hl-fn      { color: #82aaff; }
.code-block .hl-num     { color: #f78c6c; }
.code-block .hl-comment { color: #546e7a; font-style: italic; }
.code-block .hl-dim     { color: #555; }

.controls {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}

button {
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}
button:hover {
  border-color: rgba(0,0,0,0.2);
  background: #f5f5f3;
}
button.active {
  background: var(--text);
  border-color: var(--text);
  color: #fff;
}

.mode-buttons {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.mode-btn {
  font-size: 0.72rem;
  padding: 0.35rem 0.7rem;
}

.toggle-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.8rem;
  padding: 0.25rem 0;
}

.toggle-row label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

input[type=checkbox] {
  accent-color: var(--text);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
}

input[type=range] {
  flex: 1;
  accent-color: var(--text);
  height: 4px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  font-size: 0.72rem;
  padding-top: 0.3rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hint {
  font-size: 0.7rem;
  color: var(--dim);
  line-height: 1.5;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

@media (max-width: 720px) {
  .main-layout { flex-direction: column; align-items: center; }
  .sidebar { max-width: 500px; width: 100%; }
}