:root {
  color-scheme: light dark;
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: rgba(0, 0, 0, 0.55);
  --panel-bg: #ffffff;
  --panel-border: #e5e5e5;
  --code-bg: rgba(0, 0, 0, 0.06);
  --code-fg: #2a2a2a;
  --accent: #2563eb;
  --kbd-bg: rgba(0, 0, 0, 0.08);
  --kbd-border: rgba(0, 0, 0, 0.18);
  --button-bg: #ffffff;
  --button-border: #d1d1d1;
  --button-hover: #f3f3f3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f10;
    --fg: #ececec;
    --muted: rgba(255, 255, 255, 0.55);
    --panel-bg: #181819;
    --panel-border: #2a2a2c;
    --code-bg: rgba(255, 255, 255, 0.08);
    --code-fg: #e8e8e8;
    --accent: #60a5fa;
    --kbd-bg: rgba(255, 255, 255, 0.10);
    --kbd-border: rgba(255, 255, 255, 0.22);
    --button-bg: #1e1e1e;
    --button-border: #3c3c3c;
    --button-hover: #2a2a2a;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family:
    ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

code,
kbd,
pre {
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

kbd {
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.85em;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* hero */
.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 36px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.hero .tagline {
  margin: 0 auto 12px;
  max-width: 560px;
  color: var(--muted);
}

.hero .links {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.hero .links .sep {
  margin: 0 8px;
  opacity: 0.5;
}

/* panel */
.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.panel .muted {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
}

/* row + cell */
.row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 32px;
}

.row.imperative,
.row.events {
  align-items: center;
}

.cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 120px;
}

.caption {
  font-size: 13px;
  color: var(--muted);
}

.snippet {
  font-size: 12px;
  display: block;
  white-space: nowrap;
}

/* imperative controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.controls button {
  background: var(--button-bg);
  color: var(--fg);
  border: 1px solid var(--button-border);
  border-radius: 6px;
  padding: 6px 14px;
  font:
    inherit;
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  cursor: pointer;
  transition:
    background-color 0.15s,
    border-color 0.15s;
}

.controls button:hover {
  background: var(--button-hover);
}

.controls button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* event log */
.event-log {
  list-style: none;
  margin: 0;
  padding: 12px;
  flex: 1;
  min-width: 240px;
  max-height: 220px;
  overflow-y: auto;
  background: var(--code-bg);
  border-radius: 8px;
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.event-log li {
  padding: 4px 0;
  border-bottom: 1px solid var(--panel-border);
}

.event-log li:last-child {
  border-bottom: none;
}

.event-log .placeholder {
  color: var(--muted);
  font-style: italic;
  border-bottom: none;
}

.event-log .evt-pin {
  color: #16a34a;
}

.event-log .evt-unpin {
  color: #dc2626;
}

@media (prefers-color-scheme: dark) {
  .event-log .evt-pin {
    color: #4ade80;
  }
  .event-log .evt-unpin {
    color: #f87171;
  }
}

/* code block */
pre.code {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 12.5px;
  overflow-x: auto;
  margin: 20px 0 0;
}

pre.code code {
  background: transparent;
  padding: 0;
}

/* footer */
.footer {
  text-align: center;
  margin-top: 40px;
  font-size: 13px;
  color: var(--muted);
}

.footer p {
  margin: 0;
}