:root {
  --border: #d0d0d0;
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --accent: #0066cc;
  --code-bg: #f5f5f5;
  --card-bg: #fafafa;
  --callout-bg: #fff7e6;
  --callout-border: #ffb84d;
  --callout-strong: #b35900;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

h1 { font-size: 28px; margin: 16px 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 24px 0 4px; }

p { margin: 8px 0; }

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

code, pre {
  font-family: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13.5px;
}

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
  overflow-x: auto;
  line-height: 1.45;
  margin: 12px 0;
}

pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  white-space: pre;
}

.card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  background: var(--card-bg);
  margin: 16px 0;
}

.card iframe,
.card #player-f {
  display: block;
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 9;
  height: auto;
  margin: 0 auto;
  border: 0;
}

.callout {
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-left: 4px solid var(--callout-border);
  padding: 12px 14px;
  border-radius: 4px;
  margin: 16px 0;
}

.callout strong { color: var(--callout-strong); }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14.5px;
}

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--card-bg);
  font-weight: 600;
}

ol, ul { padding-left: 24px; }
ol li, ul li { margin: 4px 0; }

.muted { color: var(--muted); font-size: 14px; }
.kv { margin: 4px 0; }
.kv strong { display: inline-block; min-width: 110px; }

hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }

@media (max-width: 600px) {
  main { padding: 16px 14px 60px; }
  h1 { font-size: 24px; }
  th, td { padding: 6px 8px; font-size: 13.5px; }
  pre { font-size: 12.5px; }
}