:root {
  --fg: #1d2330;
  --muted: #5b6475;
  --bg: #f6f7f9;
  --card: #ffffff;
  --line: #dde1e8;
  --accent: #1f5fbf;
  --error: #b42318;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

header, main { max-width: 960px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.4rem; margin: 8px 0; }
h2 { font-size: 1.1rem; margin: 0 0 8px; }
h3 { font-size: 1rem; margin: 20px 0 8px; }
.note { color: var(--muted); margin: 0; }

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.buttons { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }

button {
  font: inherit;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button.secondary { background: #fff; color: var(--accent); }

.error { color: var(--error); white-space: pre-wrap; }

.summary { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 0; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; word-break: break-all; font-family: ui-monospace, monospace; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; vertical-align: top; padding: 4px 8px; border-top: 1px solid var(--line); }
th { width: 30%; color: var(--muted); font-weight: normal; }
td { word-break: break-all; font-family: ui-monospace, monospace; }

pre {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
}