:root {
  color-scheme: light;
  --page-bg: #eef2f3;
  --panel-bg: rgba(255, 255, 255, 0.9);
  --panel-border: rgba(22, 37, 62, 0.14);
  --panel-shadow: 0 24px 60px rgba(31, 41, 55, 0.14);
  --ink-strong: #10233f;
  --ink-soft: #58677d;
  --accent: #1f6feb;
  --accent-strong: #164ea8;
  --body-gradient-start: #f8fbfc;
  --hero-glow: rgba(31, 111, 235, 0.1);
  --control-bg: #fff;
  --control-border: rgba(16, 35, 63, 0.15);
  --button-secondary-bg: #fff;
  --divider: rgba(16, 35, 63, 0.1);
  --status-bg: rgba(16, 35, 63, 0.05);
  --canvas-bg: #fff;
  --canvas-frame-bg:
    linear-gradient(135deg, rgba(15, 23, 42, 0.05), rgba(15, 23, 42, 0.02)),
    #fff;
  --canvas-border: rgba(16, 35, 63, 0.08);
  --source-bg: #111827;
  --source-fg: #e5e7eb;
  --source-divider: rgba(229, 231, 235, 0.14);
  --theme-hover-bg: rgba(31, 111, 235, 0.08);
}

[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #111827;
  --panel-bg: rgba(24, 32, 45, 0.9);
  --panel-border: rgba(148, 163, 184, 0.22);
  --panel-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --ink-strong: #eef2ff;
  --ink-soft: #aab6c8;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --body-gradient-start: #0b1020;
  --hero-glow: rgba(125, 211, 252, 0.12);
  --control-bg: #0f172a;
  --control-border: rgba(148, 163, 184, 0.26);
  --button-secondary-bg: #0f172a;
  --divider: rgba(148, 163, 184, 0.18);
  --status-bg: rgba(148, 163, 184, 0.12);
  --canvas-bg: #fff;
  --canvas-frame-bg:
    linear-gradient(135deg, rgba(148, 163, 184, 0.16), rgba(15, 23, 42, 0.18)),
    #0f172a;
  --canvas-border: rgba(148, 163, 184, 0.2);
  --source-bg: #020617;
  --source-fg: #e5e7eb;
  --source-divider: rgba(148, 163, 184, 0.18);
  --theme-hover-bg: rgba(125, 211, 252, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, var(--hero-glow), transparent 28%),
    linear-gradient(180deg, var(--body-gradient-start) 0%, var(--page-bg) 100%);
  color: var(--ink-strong);
}

.page-shell {
  max-width: 1360px;
  margin: 0 auto;
  padding: 32px 20px 40px;
}

.hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 0.96;
}

.hero-copy {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: 1.03rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.docs-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.docs-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 11px;
  border: 1px solid var(--control-border);
  border-radius: 8px;
  color: var(--accent-strong);
  background: var(--button-secondary-bg);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.docs-links a:hover {
  color: var(--ink-strong);
  background: var(--theme-hover-bg);
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.controls-panel,
.canvas-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(16px);
}

.controls-panel {
  padding: 22px;
}

.field-label,
.status-label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.stacked-field-label {
  margin-top: 14px;
}

select,
button {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--control-border);
  font: inherit;
}

select {
  padding: 12px 14px;
  background: var(--control-bg);
  color: var(--ink-strong);
}

button {
  margin-top: 12px;
  padding: 12px 14px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--accent-strong) 100%
  );
  cursor: pointer;
}

button:hover {
  filter: brightness(1.03);
}

button:disabled {
  cursor: not-allowed;
  filter: none;
  opacity: 0.55;
}

.secondary-button {
  color: var(--accent-strong);
  background: var(--button-secondary-bg);
}

.theme-toggle {
  width: auto;
  min-width: 104px;
  margin-top: 0;
  padding: 9px 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  color: var(--ink-soft);
  background: var(--panel-bg);
  box-shadow: none;
}

.theme-toggle:hover {
  color: var(--ink-strong);
  background: var(--theme-hover-bg);
  filter: none;
}

.theme-toggle-icon {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.theme-toggle-label {
  font-size: 0.9rem;
  font-weight: 700;
}

.meta-block {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--divider);
}

.meta-block h2 {
  margin: 0 0 10px;
  font-size: 1.35rem;
}

.meta-block p {
  margin: 0;
  line-height: 1.6;
  color: var(--ink-soft);
}

.status-block {
  margin-top: 22px;
  padding: 16px;
  border-radius: 18px;
  background: var(--status-bg);
}

#statusMsg {
  display: block;
  font-weight: 600;
}

.canvas-panel {
  padding: 18px;
}

.canvas-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.toolbar-button {
  width: auto;
  margin-top: 0;
  padding: 8px 14px;
  color: var(--accent-strong);
  background: var(--button-secondary-bg);
  border: 1px solid var(--control-border);
  border-radius: 10px;
  font-size: 0.92rem;
}

.toolbar-button[aria-pressed="true"] {
  color: #fff;
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--accent-strong) 100%
  );
  border-color: transparent;
}

.toolbar-hint {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.canvas-frame {
  overflow: hidden;
  border-radius: 18px;
  background: var(--canvas-frame-bg);
  border: 1px solid var(--canvas-border);
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--canvas-bg);
}

.source-panel {
  margin-top: 20px;
  background: var(--source-bg);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: var(--panel-shadow);
  color: var(--source-fg);
  overflow: hidden;
}

.source-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--source-divider);
}

.source-panel h2 {
  margin: 0;
  font-size: 1rem;
}

.compact-button {
  width: auto;
  min-width: 80px;
  margin-top: 0;
  padding: 8px 12px;
}

.source-panel pre {
  max-height: min(60vh, 720px);
  margin: 0;
  padding: 18px;
  overflow: auto;
}

.source-panel code {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.55;
  white-space: pre;
}

.tok-keyword {
  color: #93c5fd;
  font-weight: 700;
}

.tok-function {
  color: #fcd34d;
}

.tok-builtin {
  color: #c4b5fd;
}

.tok-string {
  color: #86efac;
}

.tok-number {
  color: #fca5a5;
}

.tok-comment {
  color: #9ca3af;
  font-style: italic;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .controls-panel {
    order: 2;
  }

  .canvas-panel {
    order: 1;
  }
}

@media (max-width: 640px) {
  .hero {
    align-items: stretch;
    flex-direction: column;
  }

  .theme-toggle {
    align-self: flex-start;
  }
}