:root {
  --manual-bg: #f4efe6;
  --manual-surface: #fffaf0;
  --manual-ink: #24303a;
  --manual-muted: #6c756d;
  --manual-line: #d9cfbc;
  --manual-accent: #7d4c2f;
  --manual-accent-soft: #efe3cf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--manual-ink);
  background:
    radial-gradient(circle at top left, #fff8ea, transparent 28%),
    linear-gradient(180deg, #efe8dd 0%, var(--manual-bg) 100%);
}

.manual-shell {
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  min-height: 100vh;
}

.manual-sidebar {
  border-right: 1px solid var(--manual-line);
  background: rgba(255, 250, 240, 0.78);
  backdrop-filter: blur(8px);
  padding: 24px 20px;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
}

.manual-brand {
  color: var(--manual-ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.manual-locale-switch {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}

.manual-locale-switch a {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--manual-line);
  text-decoration: none;
  color: var(--manual-ink);
  background: white;
}

.manual-locale-pill {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--manual-accent);
  color: var(--manual-ink);
  background: var(--manual-accent-soft);
}

.manual-locale-pill--disabled {
  border-color: var(--manual-line);
  color: var(--manual-muted);
  background: #f4f5f7;
  cursor: not-allowed;
}

.manual-locale-switch a[aria-current="page"],
.manual-locale-switch .manual-locale-pill[aria-current="page"] {
  border-color: var(--manual-accent);
  background: var(--manual-accent-soft);
}

.manual-meta {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--manual-line);
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 11px;
  color: var(--manual-muted);
}

.manual-toc {
  margin-top: 28px;
  font-size: 14px;
}

.manual-toc ul {
  margin: 10px 0 0;
  padding-left: 18px;
}

.manual-content {
  padding: 40px min(5vw, 56px);
  max-width: 980px;
}

.manual-header {
  margin-bottom: 30px;
}

.manual-header h1 {
  margin: 8px 0 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
}

.manual-summary {
  margin: 0;
  color: var(--manual-muted);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.manual-content img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  border: 1px solid var(--manual-line);
  box-shadow: 0 18px 40px rgba(36, 48, 58, 0.12);
  background: white;
}

.manual-content pre,
.manual-content code {
  font-family: "SFMono-Regular", "Menlo", monospace;
}

.manual-content blockquote {
  margin: 24px 0;
  padding: 12px 18px;
  border-left: 4px solid var(--manual-accent);
  background: rgba(255, 255, 255, 0.55);
}

.manual-content a {
  color: var(--manual-accent);
}

@media (max-width: 900px) {
  .manual-shell {
    grid-template-columns: 1fr;
  }

  .manual-sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--manual-line);
  }

  .manual-content {
    padding: 28px 18px 64px;
  }
}