@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;1,300;1,400&family=DM+Sans:wght@300;400;500&family=DM+Mono:wght@400;500&family=Noto+Sans+JP:wght@300;400;500&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:     #ffffff;
  --fg:     #0a0a0a;
  --muted:  #939393;
  --border: #e6e6e6;
  --serif:  'Cormorant Garamond', 'Noto Serif JP', Georgia, serif;
  --sans:   'DM Sans', 'Noto Sans JP', system-ui, sans-serif;
  --mono:   'DM Mono', 'Courier New', monospace;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
}

/* ── Language toggle ── */
html[lang="en"] .doc-body.ja      { display: none; }
html[lang="en"] .doc-lang-divider { display: none; }
html[lang="en"] .doc-ja              { display: none !important; }
html[lang="en"] ol.doc-ja            { display: none !important; }
html[lang="en"] blockquote.doc-ja   { display: none !important; }
html[lang="ja"] .doc-body:not(.ja)  { display: none; }
html[lang="ja"] ol.doc-en            { display: none !important; }
html[lang="ja"] blockquote.doc-en   { display: none !important; }
html[lang="ja"] .doc-lang-divider { display: none; }
html[lang="ja"] .doc-en           { display: none !important; }
html[lang="ja"] body { font-family: 'Noto Sans JP', 'DM Sans', sans-serif; }

/* Inline .doc-ja spans show as block so no <br> needed */
.doc-ja:not(.doc-body) { display: block; }

.doc-bar-right {
  display: flex;
  align-items: center;
  gap: 0;
}
.lang-btn {
  background: none;
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 5px 12px;
  cursor: pointer;
}
.lang-btn + .lang-btn { border-left: none; }
.lang-btn.active      { background: var(--fg); color: #fff; border-color: var(--fg); }
.lang-btn:not(.active):hover { color: var(--fg); }

/* ── Top bar ── */
.doc-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 52px;
}
.doc-bar-left {
  display: flex;
  align-items: center;
  gap: 20px;
}
.doc-back {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.15s;
}
.doc-back:hover { color: var(--fg); }
.doc-bar-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.doc-bar-title {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg);
  letter-spacing: 0.04em;
}

/* ── Layout ── */
.doc-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 72px 40px 120px;
}

/* ── Header ── */
.doc-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 40px;
  margin-bottom: 56px;
}
.doc-header-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.doc-header h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 38px;
  line-height: 1.2;
  margin-bottom: 4px;
}
.doc-header h1 span {
  display: block;
  font-size: 22px;
  color: var(--muted);
  margin-top: 4px;
}
.doc-meta {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.doc-meta-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  font-size: 12.5px;
  line-height: 1.6;
}
.doc-meta-key {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.04em;
  padding-top: 2px;
}
.doc-meta-val { font-weight: 400; }
.doc-meta-placeholder { color: var(--muted); }

/* ── Sections ── */
.doc-section {
  margin-bottom: 52px;
}
.doc-section-num {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}
.doc-section h2 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.doc-section h3 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 12.5px;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--fg);
}

/* ── Body text ── */
.doc-body {
  font-size: 13.5px;
  line-height: 1.75;
  font-weight: 300;
  color: var(--fg);
}
.doc-body + .doc-body {
  margin-top: 16px;
}
.doc-body.ja {
  margin-top: 10px;
  font-size: 13px;
}

/* ── Divider ── */
.doc-lang-divider {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 12px 0 16px;
}

/* ── Table ── */
.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  margin-top: 16px;
}
.doc-table th {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: left;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--border);
}
.doc-table td {
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.6;
  font-weight: 300;
}
.doc-table td:first-child {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  padding-right: 24px;
}
.doc-table tr:last-child td { border-bottom: none; }
html[lang="ja"] .doc-table td span[style*="color:var(--muted)"] { color: var(--fg) !important; }
html[lang="ja"] blockquote.doc-ja { color: var(--fg) !important; }
html[lang="ja"] ol.doc-ja li { color: var(--fg) !important; }
html[lang="ja"] li span[style*="color:var(--muted)"] { color: var(--fg) !important; }
html[lang="ja"] span[style*="color:var(--muted)"] { color: var(--fg) !important; }

/* ── List ── */
.doc-list {
  list-style: none;
  margin-top: 12px;
}
.doc-list li {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.6;
  font-weight: 300;
}
.doc-list li:first-child { border-top: 1px solid var(--border); }
html[lang="ja"] .doc-list li strong { display: block; margin-bottom: 2px; }
html[lang="ja"] .doc-list li .doc-ja { display: block; }
.doc-list li::before {
  content: '—';
  font-family: var(--mono);
  color: var(--muted);
  flex-shrink: 0;
  font-size: 11px;
  padding-top: 2px;
}

/* ── Checklist ── */
.doc-checklist {
  list-style: none;
  margin-top: 12px;
}
.doc-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.5;
  font-weight: 300;
}
.doc-checklist li:first-child { border-top: 1px solid var(--border); }
.doc-check-box {
  width: 14px;
  height: 14px;
  border: 1px solid var(--border);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ── Blockquote ── */
.doc-quote {
  border-left: 2px solid var(--fg);
  padding: 16px 24px;
  margin: 20px 0;
  font-family: var(--serif);
  font-size: 17px;
  font-style: italic;
  line-height: 1.65;
  font-weight: 300;
}
.doc-quote-attr {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  margin-top: 10px;
  font-style: normal;
}

/* ── Code block ── */
.doc-code {
  font-family: var(--mono);
  font-size: 11px;
  background: #f5f5f5;
  border: 1px solid var(--border);
  padding: 16px 20px;
  margin-top: 12px;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
}

/* ── Signature block ── */
.doc-signature {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.doc-signature-line {
  width: 240px;
  border-bottom: 1px solid var(--fg);
  margin: 48px 0 8px;
}
.doc-signature-name {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg);
}

/* ── Footer ── */
.doc-footer {
  margin-top: 80px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .doc-bar { padding: 0 20px; }
  .doc-wrap { padding: 48px 20px 80px; }
  .doc-header h1 { font-size: 28px; }
  .doc-meta-row { grid-template-columns: 1fr; gap: 2px; }
  .doc-footer { flex-direction: column; gap: 8px; }
}