:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --text: #1f2328;
  --muted: #59636e;
  --accent: #2e7d32;
  --border: #d1d9e0;
  --red: #c62828;
  --green: #2e7d32;
  --caution-bg: #fff8e1;
  --caution-border: #f9a825;
  --note-bg: #e8f1fb;
  --note-border: #1f6feb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --surface: #1b1f24;
    --text: #e6edf3;
    --muted: #9198a1;
    --accent: #66bb6a;
    --border: #30363d;
    --red: #ef5350;
    --green: #66bb6a;
    --caution-bg: #2b2410;
    --caution-border: #d4a72c;
    --note-bg: #102133;
    --note-border: #4493f8;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 16px 0;
  font-size: 0.95rem;
}
.site-nav a { text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

header { margin-bottom: 32px; }
header img { width: 72px; height: 72px; border-radius: 16px; }
h1 { font-size: 2rem; margin: 12px 0 4px; line-height: 1.25; }
h2 { font-size: 1.35rem; margin-top: 48px; padding-top: 8px; border-top: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin-top: 28px; }
h2, h3 { scroll-margin-top: 16px; }
.tagline, .meta { color: var(--muted); }
a { color: var(--accent); }
ul, ol { padding-left: 24px; }
li { margin: 4px 0; }
code, kbd {
  font: 0.9em ui-monospace, SFMono-Regular, Consolas, monospace;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 4px;
}
.ui { font-weight: 600; }

.button {
  display: inline-block;
  margin: 8px 8px 0 0;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
}

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}
.toc ol { margin: 8px 0 0; columns: 2 240px; column-gap: 32px; }
.toc li { break-inside: avoid; }

.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface); }

.notice {
  border-left: 4px solid;
  border-radius: 4px;
  padding: 10px 14px;
  margin: 16px 0;
}
.notice p { margin: 4px 0; }
.notice .label { font-weight: 700; letter-spacing: 0.04em; }
.caution { background: var(--caution-bg); border-color: var(--caution-border); }
.note { background: var(--note-bg); border-color: var(--note-border); }

.red { color: var(--red); font-weight: 600; }
.green { color: var(--green); font-weight: 600; }

.diagram {
  font: 0.9rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  overflow-x: auto;
  white-space: pre;
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { margin-right: 16px; }