:root {
  color-scheme: light;
  --ink: #141a2b;
  --muted: #5f6678;
  --line: #d8dce6;
  --paper: #f9fafc;
  --surface: #ffffff;
  --hover: #f0f3fa;
  --accent: #1f4fa3;
  --accent-dark: #173c7d;
  --medal: #a96817;
  --gold: #b8894d;
  --up: #08783e;
  --down: #b42318;
  --status-bg: #f2f4f9;
  --notice-bg: #faf6ef;
  font-family: Inter, "Noto Sans JP", "Yu Gothic", YuGothic, system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ink: #e7eaf2;
    --muted: #9aa2b5;
    --line: #2d3446;
    --paper: #0f131d;
    --surface: #161b27;
    --hover: #1d2433;
    --accent: #7ea6f2;
    --accent-dark: #a9c3f7;
    --medal: #e0a458;
    --up: #4cc38a;
    --down: #f07a6e;
    --status-bg: #131825;
    --notice-bg: #221d14;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e7eaf2;
  --muted: #9aa2b5;
  --line: #2d3446;
  --paper: #0f131d;
  --surface: #161b27;
  --hover: #1d2433;
  --accent: #7ea6f2;
  --accent-dark: #a9c3f7;
  --medal: #e0a458;
  --up: #4cc38a;
  --down: #f07a6e;
  --status-bg: #131825;
  --notice-bg: #221d14;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); margin: 0; min-width: 320px; line-height: 1.65; }
a { color: var(--accent-dark); text-underline-offset: .18em; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

.skip-link { position: fixed; top: -4rem; left: 1rem; z-index: 20; background: var(--ink); color: var(--paper); padding: .55rem .8rem; }
.skip-link:focus { top: 1rem; }

.site-header { border-bottom: 1px solid var(--line); background: var(--paper); }
.header-inner { display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  max-width: 1080px; min-height: 58px; margin: 0 auto; padding: 0 24px; }
.brand { color: var(--ink); font: 800 1.08rem ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .02em; text-decoration: none; }
.brand span { color: var(--accent); }
.site-header nav { display: flex; gap: 1.25rem; font-size: .88rem; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }

.page-shell { max-width: 1080px; margin: 0 auto; padding: 36px 24px 72px; }
.page-intro { margin-bottom: 18px; }
.eyebrow { color: var(--accent-dark); letter-spacing: .13em; text-transform: uppercase;
  margin: 0 0 .35rem; font: 700 .72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; }
h1 { margin: 0; font-size: clamp(1.75rem, 4vw, 2.75rem); line-height: 1.2; letter-spacing: -.035em; }
h2 { margin: 0; font-size: 1.25rem; line-height: 1.35; }
.lede { max-width: 46rem; color: var(--muted); margin: .55rem 0 0; font-size: .96rem; }

.field-tabs { display: flex; flex-wrap: wrap; gap: .375rem; margin: 0 0 22px; }
.field-tab { display: inline-flex; align-items: center; justify-content: center; min-height: 2.35rem;
  padding: .35rem .95rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  color: var(--ink); font-size: .85rem; font-weight: 700; text-decoration: none; }
.field-tab:hover { border-color: var(--accent); color: var(--accent-dark); background: var(--hover); }
.field-tab[aria-current="true"], .field-tab[aria-current="true"]:hover { border-color: var(--ink); background: var(--ink); color: var(--surface); }
.championship-tab { border-color: var(--gold); margin-right: .35rem; }

.ranking-head { display: flex; justify-content: space-between; align-items: end; gap: 1rem;
  padding: 0 0 .75rem; border-bottom: 2px solid var(--ink); }
.ranking-context { display: flex; flex-wrap: wrap; gap: .45rem; margin: .3rem 0 0; color: var(--muted); font-size: .82rem; }
.record-count { margin: 0; color: var(--muted); font-size: .8rem; white-space: nowrap; }
.live-status { display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; padding: .55rem .7rem;
  border-bottom: 1px solid var(--line); background: var(--status-bg); color: var(--muted); font-size: .76rem; }
.live-status p { margin: 0; }
.live-status strong { color: var(--ink); }

.table-wrap { width: 100%; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--surface); font-variant-numeric: tabular-nums; }
th, td { border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; padding: .72rem .7rem; }
th { color: var(--muted); font-size: .72rem; letter-spacing: .06em; font-weight: 700; }
td { font-size: .92rem; }
.ranking-table { table-layout: fixed; }
.ranking-table th:first-child, .ranking-table td:first-child { width: 84px; padding-left: 1rem; }
.numeric { text-align: right; width: 120px; padding-right: 1rem; font-weight: 750; white-space: nowrap; }
tbody tr:hover { background: var(--hover); }
.rank { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-weight: 750; }
.top-rank { color: var(--medal); }
.rank-change { width: 76px; text-align: center; font-weight: 750; }
.up { color: var(--up); }
.down { color: var(--down); }
.flat { color: var(--muted); }
.badge.new { display: inline-block; padding: 0 .4rem; border-radius: 4px; background: var(--accent); color: var(--surface); font-size: .68rem; letter-spacing: .05em; }
.delta { display: inline-block; min-width: 2.6em; margin-left: .35rem; color: var(--muted); font-size: .72rem; font-weight: 750; }
.delta.increase { color: var(--up); }
.delta.decrease { color: var(--down); }
.muted { color: var(--muted); font-weight: 400; }
.university-link, .author-link { font-weight: 700; text-decoration-thickness: 1px; }
.status { color: var(--muted); margin: 1rem 0 0; font-size: .82rem; }

.breakdown { margin-top: 3rem; }
.championship-breakdown th:first-child, .championship-breakdown td:first-child { width: 64px; padding-left: 1rem; }
.championship-breakdown td { font-size: .85rem; }
.championship-breakdown .numeric { width: auto; min-width: 84px; }
.championship-breakdown td.numeric span { display: block; line-height: 1.35; }
.bd-rank { color: var(--muted); font-weight: 600; }
.bd-pts { color: var(--muted); font-size: .8rem; }
.scored .bd-pts { color: var(--accent-dark); }
.bd-n { color: var(--muted); font-size: .72rem; font-weight: 500; }

.back-link { display: inline-block; margin-bottom: 1.25rem; font-size: .82rem; }
.detail-heading { margin-bottom: 2rem; }
.stat-line { color: var(--muted); margin: .75rem 0 0; }
.stat-line strong { color: var(--ink); font-size: 1.4rem; }
section + section { margin-top: 2.5rem; }
.univ-table td:first-child { font-weight: 700; }

.paper-list { margin: 0; padding: 0; list-style: none; }
.paper-item { display: grid; grid-template-columns: 84px 1fr auto; gap: .25rem 1rem; padding: 1rem .7rem;
  border-bottom: 1px solid var(--line); background: var(--surface); }
.paper-meta { color: var(--muted); font: .78rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; }
.paper-title { color: var(--ink); font-weight: 650; text-decoration-thickness: 1px; }
.doi-link { align-self: start; font: 700 .72rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; }
.paper-coauthors, .paper-univs { grid-column: 2 / -1; color: var(--muted); font-size: .82rem; line-height: 1.55; overflow-wrap: anywhere; }
.paper-coauthors strong { color: var(--ink); }
.paper-univs { font-size: .76rem; }

.prose { max-width: 760px; }
.prose h2 { margin-top: 2.2rem; padding-bottom: .45rem; border-bottom: 1px solid var(--line); }
.prose p, .prose li { color: var(--ink); opacity: .88; }
.prose li + li { margin-top: .4rem; }
.prose table { margin: 1rem 0; }
.points-table th, .points-table td { text-align: center; padding: .5rem .35rem; }

.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; max-width: 1080px; margin: 0 auto;
  padding: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: .74rem; }
.site-footer p { margin: 0; }
.site-footer .footer-disclaimer { flex-basis: 100%; }

@media (max-width: 720px) {
  .header-inner, .page-shell, .site-footer { padding-left: 16px; padding-right: 16px; }
  .page-shell { padding-top: 18px; }
  .page-intro h1 { font-size: clamp(1.65rem, 7.4vw, 1.95rem); }
  .field-tab { padding: .3rem .7rem; font-size: .8rem; }
  .ranking-head { align-items: start; }
  .live-status, .japan-paper-presence { display: none; }
  .ranking-table th:first-child, .ranking-table td:first-child { width: 52px; padding-left: .55rem; }
  th, td { padding: .66rem .45rem; }
  .numeric { width: 84px; padding-right: .55rem; }
  .rank-change { width: 58px; }
  .delta { min-width: 0; margin-left: .2rem; }
  .paper-item { grid-template-columns: 60px minmax(0, 1fr); gap: .25rem .65rem; }
  .doi-link { grid-column: 2; }
  .site-footer { flex-direction: column; }
}

.tier-tag { align-self: center; margin: 0 .1rem 0 .4rem; color: var(--muted);
  font: 700 .66rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .08em; text-transform: uppercase; }
.tier-label { display: block; color: var(--muted); font-size: .64rem; font-weight: 600; letter-spacing: .02em; }
.univ-table .tier-label { display: inline; margin-left: .35rem; }

/* switches: entity, edition, counting mode */
.switches { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin: 0 0 14px; }
.entity-switch, .mode-switch { display: inline-flex; border: 1px solid var(--line); border-radius: .5rem; overflow: hidden; background: var(--surface); }
.entity-switch a, .mode-switch button { padding: .38rem .8rem; border: 0; background: none; color: var(--muted);
  font: 700 .8rem/1.4 inherit; font-family: inherit; text-decoration: none; cursor: pointer; }
.entity-switch a + a, .mode-switch button + button { border-left: 1px solid var(--line); }
.entity-switch a[aria-current="true"], .mode-switch button[aria-checked="true"] { background: var(--ink); color: var(--surface); }
.entity-switch a:hover, .mode-switch button:hover { color: var(--accent-dark); }
.entity-switch a[aria-current="true"]:hover, .mode-switch button[aria-checked="true"]:hover { color: var(--surface); }
.mode-switch { margin-left: auto; }
.edition-selector { display: inline-flex; align-items: center; gap: .45rem; color: var(--muted); font-size: .76rem; font-weight: 700; }
.edition-selector select { min-height: 2.1rem; padding: .2rem 1.6rem .2rem .55rem; border: 1px solid var(--line); border-radius: .45rem;
  background: var(--surface); color: var(--ink); font: inherit; }
.orcid { margin-left: .35rem; padding: 0 .3rem; border-radius: 3px; background: #a6ce39; color: #1c2a00; font-size: .6rem; font-weight: 800; vertical-align: .1em; }
.empty { padding: 2rem 1rem; color: var(--muted); background: var(--surface); border-bottom: 1px solid var(--line); margin: 0; }

/* trend chart — categorical slots 1-6 of the validated reference palette */
.trend { margin: 0; padding: 1rem .5rem .5rem; background: var(--surface); border-bottom: 1px solid var(--line);
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4; --s6: #008300; }
.trend svg { display: block; width: 100%; max-width: 640px; height: auto; }
.trend .grid { stroke: var(--line); stroke-width: 1; }
.trend .axis { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.trend .bar-total { fill: var(--ink); font-size: 11px; font-weight: 700; }
.trend .seg:hover { opacity: .8; }
.s-isscc { fill: var(--s1); background: var(--s1); }
.s-vlsi { fill: var(--s2); background: var(--s2); }
.s-jssc { fill: var(--s3); background: var(--s3); }
.s-cicc { fill: var(--s4); background: var(--s4); }
.s-asscc { fill: var(--s5); background: var(--s5); }
.s-esscirc { fill: var(--s6); background: var(--s6); }
.legend { display: flex; flex-wrap: wrap; gap: .3rem 1rem; margin: .6rem 0 0 .4rem; color: var(--muted); font-size: .76rem; }
.legend span { display: inline-flex; align-items: center; gap: .35rem; }
.legend i { display: inline-block; width: .7rem; height: .7rem; border-radius: 2px; }
.trend-table { margin: .6rem .4rem 0; font-size: .8rem; color: var(--muted); }
.trend-table summary { cursor: pointer; }
.trend-table table { margin-top: .5rem; }
.trend-table th, .trend-table td { padding: .35rem .5rem; font-size: .8rem; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .trend { --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; }
}
:root[data-theme="dark"] .trend { --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181; --s6: #008300; }
@media (max-width: 720px) {
  .mode-switch { margin-left: 0; }
  .entity-switch a, .mode-switch button { padding: .34rem .6rem; font-size: .76rem; }
}

@media (max-width: 420px) {
  .header-inner { gap: .5rem; }
  .site-header nav { gap: .7rem; font-size: .76rem; }
  .page-intro h1 { font-size: 1.55rem; }
}

/* bilingual text: site.js / the boot script set html[data-lang] */
html:not([data-lang="en"]) .l-en { display: none !important; }
html[data-lang="en"] .l-ja { display: none !important; }
.lang-toggle { padding: .2rem .6rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  color: var(--ink); font: 700 .74rem/1.4 inherit; font-family: inherit; cursor: pointer; }
.lang-toggle:hover { border-color: var(--accent); color: var(--accent-dark); }
.site-header nav { align-items: center; }

/* country switch */
.scope-switch { display: inline-flex; flex-wrap: wrap; gap: .3rem; }
.scope-switch a { padding: .3rem .8rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface);
  color: var(--muted); font-size: .8rem; font-weight: 700; text-decoration: none; }
.scope-switch a:hover { border-color: var(--accent); color: var(--accent-dark); }
.scope-switch a[aria-current="true"] { border-color: var(--accent); background: var(--accent); color: var(--surface); }
.cc { display: inline-block; margin-left: .3rem; padding: 0 .3rem; border: 1px solid var(--line); border-radius: 3px;
  color: var(--muted); font: 700 .62rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; vertical-align: .12em; }
.switches + .switches { margin-top: -6px; }