:root {
  --paper: #f5f3ee;
  --surface: #ffffff;
  --ink: #172027;
  --muted: #68737b;
  --line: #d9ddd9;
  --cyan: #007f91;
  --cyan-dark: #075d69;
  --coral: #e85d4a;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif; letter-spacing: 0; }
button, input, select { font: inherit; }
button, select { cursor: pointer; }
a { color: inherit; }
.topbar { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 94%, transparent); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.nav { width: min(1180px, calc(100% - 32px)); min-height: 68px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--cyan); border-radius: 6px; font: 700 22px Georgia, serif; }
.brand-name { font: 700 20px Georgia, "Yu Mincho", serif; }
.unofficial { color: var(--muted); font-size: 12px; }
.nav-links { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }
.nav-links a { text-decoration: none; }
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--cyan-dark); }
main { width: min(1180px, calc(100% - 32px)); margin: 0 auto 64px; }
.page-head { padding: 54px 0 30px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 420px); align-items: end; gap: 40px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 9px; color: var(--coral); font-size: 12px; font-weight: 700; }
h1 { margin: 0; overflow-wrap: anywhere; font: 700 clamp(34px, 5vw, 58px)/1.08 Georgia, "Yu Mincho", serif; }
.lead { margin: 16px 0 0; max-width: 650px; color: var(--muted); line-height: 1.8; }
.metric { padding: 18px 20px; background: var(--ink); color: white; border-radius: 6px; }
.metric strong { display: block; font: 700 32px Georgia, serif; }
.metric span { color: #c9d0d3; font-size: 12px; }
.toolbar { padding: 22px 0; display: grid; grid-template-columns: minmax(220px, 1fr) repeat(2, minmax(150px, 220px)); gap: 10px; border-bottom: 1px solid var(--line); }
.toolbar input, .toolbar select { width: 100%; min-width: 0; padding: 11px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.summary { margin: 18px 0 10px; color: var(--muted); font-size: 13px; }
.record-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.record-row { padding: 16px 0; display: grid; grid-template-columns: minmax(220px, 1.4fr) minmax(180px, .8fr) minmax(220px, 1fr) 24px; gap: 20px; align-items: center; border-bottom: 1px solid var(--line); }
.record-row h2, .record-row h3 { margin: 0 0 4px; overflow-wrap: anywhere; font-size: 16px; }
.record-row a { text-decoration-color: var(--line); text-underline-offset: 4px; }
.record-row a:hover { color: var(--cyan-dark); text-decoration-color: var(--cyan); }
.subline, .date, .counts { color: var(--muted); overflow-wrap: anywhere; font-size: 12px; line-height: 1.65; }
.credit-line { margin-top: 6px; color: var(--cyan-dark); overflow-wrap: anywhere; font-size: 11px; line-height: 1.65; }
.counts { display: flex; flex-wrap: wrap; gap: 6px; }
.count, .tag { padding: 4px 7px; background: var(--surface); border: 1px solid var(--line); border-radius: 3px; }
.status { width: max-content; padding: 4px 7px; color: var(--cyan-dark); background: #e8f3f2; border: 1px solid #bdd9d8; border-radius: 3px; font-size: 11px; }
.status.inactive { color: var(--muted); background: #efefed; border-color: var(--line); }
.arrow { color: var(--cyan); font-weight: 700; }
.more { margin: 20px auto 0; padding: 10px 18px; display: block; color: var(--cyan-dark); background: var(--surface); border: 1px solid var(--cyan); border-radius: 4px; }
.more[hidden] { display: none; }
.empty { padding: 60px 20px; border-bottom: 1px solid var(--line); color: var(--muted); text-align: center; }
.detail-head { padding: 48px 0 28px; border-bottom: 1px solid var(--line); }
.back { display: inline-block; margin-bottom: 20px; color: var(--cyan-dark); font-size: 13px; text-decoration: none; }
.detail-meta { margin-top: 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 9px; }
.detail-section { padding: 30px 0 8px; }
.section-title { margin: 0 0 14px; display: flex; align-items: baseline; gap: 10px; font: 700 25px Georgia, "Yu Mincho", serif; }
.section-title span { color: var(--muted); font: 400 12px "Yu Gothic UI", sans-serif; }
.detail-record { padding: 16px 0; border-top: 1px solid var(--line); }
.detail-record h3 { margin: 0 0 6px; overflow-wrap: anywhere; font-size: 16px; line-height: 1.5; }
.links { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 7px; }
.links a { max-width: 100%; padding: 6px 9px; overflow-wrap: anywhere; background: var(--surface); border: 1px solid var(--line); border-radius: 3px; color: var(--cyan-dark); font-size: 11px; text-decoration: none; }
.links a:hover { border-color: var(--cyan); }
.source-note { margin: 26px 0 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
footer { margin-top: 42px; padding: 28px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.7; }
footer a { margin-left: 10px; color: var(--cyan-dark); }
.detail-section > p { max-width: 820px; color: var(--muted); line-height: 1.9; }
.page-jump { margin: 26px 0 2px; padding: 16px 18px; max-width: 820px; background: var(--surface); border-left: 3px solid var(--cyan); color: var(--muted); line-height: 1.8; }
.page-jump a, .detail-section a { color: var(--cyan-dark); text-underline-offset: 3px; }
.policy-list { max-width: 820px; margin: 0; padding-left: 1.4em; color: var(--muted); line-height: 1.9; }
.policy-list li + li { margin-top: 7px; }
.local-history-tools { max-width: 820px; margin-top: 18px; padding: 16px 18px; display: grid; gap: 12px; background: var(--surface); border: 1px solid var(--line); }
.local-history-tools > div:first-child { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.local-history-tools > div:first-child span, .local-history-tools [role="status"] { color: var(--muted); font-size: 11px; }
.local-history-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.local-history-actions button, .local-history-actions label { min-height: 36px; padding: 8px 12px; display: inline-flex; align-items: center; color: var(--cyan-dark); background: var(--paper); border: 1px solid #aac7c4; border-radius: 3px; font-size: 12px; font-weight: 700; cursor: pointer; }
.local-history-actions button:hover, .local-history-actions label:hover { color: #fff; background: var(--cyan-dark); border-color: var(--cyan-dark); }
.local-history-actions button:disabled { cursor: default; opacity: .45; }
.local-history-actions input { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
.local-history-guide { max-width: 820px; margin-top: 24px; padding-block: 18px; border-block: 1px solid var(--line); }
.local-history-guide h3 { margin: 0 0 8px; font: 700 18px Georgia, "Yu Mincho", serif; }
.local-history-guide p { margin: 0; color: var(--muted); line-height: 1.8; }
.local-history-guide ol { margin: 14px 0; padding-left: 1.5em; color: var(--muted); line-height: 1.85; }
.local-history-guide li + li { margin-top: 8px; }
.local-history-guide .local-history-note { font-size: 11px; }
.history-management-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.history-management-section { min-width: 0; padding: 30px 0 8px; }
.history-management-section > p { color: var(--muted); line-height: 1.9; }
.history-management-section > p a { color: var(--cyan-dark); text-underline-offset: 3px; }
.history-management-section .technology-spec > div { grid-template-columns: minmax(110px, 145px) minmax(0, 1fr); gap: 14px; }
.process-diagram, .local-state-diagram { max-width: 1000px; margin: 22px 0 6px; padding-block: 18px; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr); align-items: stretch; gap: 10px; border-block: 1px solid var(--line); }
.process-diagram > div, .local-state-diagram > div { min-width: 0; padding: 12px 10px; display: grid; align-content: center; gap: 4px; background: var(--surface); border-left: 3px solid var(--cyan); }
.process-diagram strong, .local-state-diagram strong, .branch-diagram strong { color: var(--ink); font-size: 13px; }
.process-diagram span:not(.process-arrow), .local-state-diagram span:not(.process-arrow), .branch-diagram span, .branch-diagram small { color: var(--muted); font-size: 10px; line-height: 1.55; }
.process-arrow { align-self: center; color: var(--coral); font-size: 20px; font-weight: 700; }
.local-state-diagram { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr); }
.local-state-diagram .local-state-browser { border-left-color: #24764f; }
.branch-diagram { max-width: 900px; margin: 22px 0; display: grid; grid-template-columns: minmax(160px, .8fr) 36px repeat(2, minmax(0, 1fr)); align-items: stretch; gap: 10px; }
.branch-source, .branch-target { min-width: 0; padding: 15px; display: grid; align-content: center; gap: 5px; background: var(--surface); border-top: 3px solid var(--cyan); }
.branch-target.limited { border-top-color: #8b9397; }
.branch-lines { position: relative; }
.branch-lines::before { content: "→"; position: absolute; inset: 50% auto auto 50%; color: var(--coral); font-size: 20px; font-weight: 700; transform: translate(-50%, -50%); }
.branch-target small { padding-top: 7px; border-top: 1px solid var(--line); }
.technology-flow { max-width: 900px; margin: 22px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; counter-reset: technology-step; }
.technology-flow li { min-height: 76px; padding: 16px 0; display: grid; grid-template-columns: 38px minmax(110px, 160px) minmax(0, 1fr); align-items: baseline; gap: 14px; border-bottom: 1px solid var(--line); counter-increment: technology-step; }
.technology-flow li::before { content: counter(technology-step, decimal-leading-zero); color: var(--coral); font: 700 12px Georgia, serif; }
.technology-flow strong { color: var(--ink); font: 700 19px Georgia, serif; }
.technology-flow span { color: var(--muted); line-height: 1.8; }
.technology-subtitle { margin: 30px 0 14px; font: 700 18px Georgia, "Yu Mincho", serif; }
.technology-spec { max-width: 900px; margin: 20px 0 0; border-top: 1px solid var(--line); }
.technology-spec > div { padding: 15px 0; display: grid; grid-template-columns: minmax(150px, 210px) minmax(0, 1fr); gap: 22px; border-bottom: 1px solid var(--line); }
.technology-spec dt { color: var(--ink); font-weight: 700; line-height: 1.75; }
.technology-spec dd { margin: 0; color: var(--muted); line-height: 1.85; }
.technology-spec code { padding: 2px 4px; background: var(--surface); border: 1px solid var(--line); border-radius: 3px; color: var(--cyan-dark); font-size: .9em; }
.technology-formula { max-width: 820px; margin: 18px 0; padding: 16px 18px; border-block: 1px solid var(--line); color: var(--ink); font-size: 16px; line-height: 1.8; }
.technology-formula span { color: var(--muted); font-size: 13px; }
.technology-formula var { color: var(--cyan-dark); font-family: Georgia, serif; font-weight: 700; }
.technology-page .page-head { grid-template-columns: minmax(0, 1fr); }
.technology-page h1 { font-size: 44px; }
.technology-page [id] { scroll-margin-top: 90px; }
.technology-toc { max-width: 900px; padding-block: 20px; border-bottom: 1px solid var(--line); }
.technology-toc h2 { margin: 0 0 10px; font-size: 16px; }
.technology-toc ol { margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 4px 20px; list-style: none; }
.technology-toc a { min-height: 44px; display: flex; align-items: center; color: var(--cyan-dark); overflow-wrap: anywhere; text-underline-offset: 4px; font-size: 14px; line-height: 1.6; }
.technology-details { max-width: 900px; border-block: 1px solid var(--line); }
.technology-details summary { padding: 16px 0; color: var(--cyan-dark); font-weight: 700; line-height: 1.7; cursor: pointer; }
.technology-details .technology-spec { margin-top: 0; }
.technology-page a:focus-visible, .technology-details summary:focus-visible { outline: 2px solid var(--cyan-dark); outline-offset: 4px; }
@media (max-width: 820px) {
  .technology-toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-links { gap: 12px; }
  .page-head { grid-template-columns: 1fr; gap: 24px; }
  .toolbar { grid-template-columns: 1fr 1fr; }
  .toolbar input { grid-column: 1 / -1; }
  .record-row { grid-template-columns: minmax(0, 1fr) auto; gap: 10px 16px; }
  .record-row > :nth-child(2), .record-row > :nth-child(3) { grid-column: 1; }
  .record-row > :last-child { grid-column: 2; grid-row: 1 / span 3; }
}
@media (max-width: 620px) {
  .technology-page h1 { font-size: 34px; }
  main, .nav { width: min(100% - 22px, 1180px); }
  .compact-mobile-nav { min-height: 48px; padding: 8px 0; flex-wrap: nowrap; gap: 10px; }
  .compact-mobile-nav .brand { flex: 0 0 auto; gap: 8px; }
  .compact-mobile-nav .brand-mark { width: 32px; height: 32px; font-size: 19px; }
  .compact-mobile-nav .brand-name { font-size: 17px; }
  .compact-mobile-nav .nav-links { width: auto; min-width: 0; flex: 1 1 auto; justify-content: flex-end; gap: clamp(6px, 2.5vw, 12px); padding: 0; border-top: 0; font-size: 12px; white-space: nowrap; }
  .compact-mobile-nav .nav-links a { min-height: 32px; display: grid; align-items: center; }
  .unofficial { display: none; }
  .page-head { padding: 32px 0 22px; gap: 16px; }
  .lead { margin-top: 12px; line-height: 1.65; }
  .metric { padding: 12px 14px; display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
  .metric strong { font-size: 26px; }
  .toolbar { grid-template-columns: 1fr; }
  .toolbar input { grid-column: auto; }
  .technology-flow li { grid-template-columns: 30px minmax(0, 1fr); gap: 6px 10px; }
  .technology-flow span { grid-column: 2; }
  .technology-spec > div { grid-template-columns: 1fr; gap: 3px; }
  .process-diagram, .local-state-diagram, .branch-diagram { grid-template-columns: 1fr; }
  .history-management-grid { grid-template-columns: 1fr; gap: 0; }
  .process-arrow { justify-self: center; transform: rotate(90deg); }
  .branch-lines { min-height: 22px; }
  .branch-lines::before { content: "↓"; }
}