/* ==========================================================================
   Lab site — shared stylesheet
   Edit the variables in :root to re-skin the whole site.
   ========================================================================== */

:root {
  /* --- Palette -------------------------------------------------------- */
  --ink:        #16202e;   /* main text */
  --ink-soft:   #55617180; /* muted text (used with color-mix fallback) */
  --muted:      #5b6675;
  --accent:     #1f4e79;   /* links, rules, headings accent */
  --accent-lt:  #e8eef5;   /* tint blocks */
  --paper:      #ffffff;
  --paper-alt:  #f7f8fa;
  --line:       #e2e6ec;

  /* --- Type ----------------------------------------------------------- */
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", Georgia,
           "Times New Roman", serif;
  --sans:  "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN",
           "Yu Gothic", "Noto Sans JP", Meiryo, sans-serif;
  --mono:  "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* --- Metrics -------------------------------------------------------- */
  --wrap: 980px;
  --gap:  1.6rem;
}

/* --------------------------------------------------------------------- */
/* Reset-ish                                                             */
/* --------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  font-feature-settings: "palt" 1;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --------------------------------------------------------------------- */
/* Bilingual switching                                                    */
/*   Elements marked [lang="ja"] / [lang="en"] show only in that mode.    */
/* --------------------------------------------------------------------- */
html[data-lang="en"] [lang="ja"],
html[data-lang="ja"] [lang="en"] { display: none !important; }

html[data-lang="ja"] body { font-family: var(--sans); }

/* --------------------------------------------------------------------- */
/* Layout                                                                 */
/* --------------------------------------------------------------------- */
.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

section.block { padding: 3.5rem 0; }
section.block + section.block { border-top: 1px solid var(--line); }
section.tint { background: var(--paper-alt); }

/* --------------------------------------------------------------------- */
/* Header / navigation                                                    */
/* --------------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex; align-items: center; gap: 1rem;
  min-height: 62px;
}

.brand {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ink);
  line-height: 1.25;
  margin-right: auto;
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand small {
  display: block;
  font-family: var(--sans);
  font-size: .68rem;
  font-weight: 400;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav { display: flex; align-items: center; gap: 1.35rem; }

.nav a {
  color: var(--ink);
  font-size: .87rem;
  letter-spacing: .02em;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { text-decoration: none; border-bottom-color: var(--line); }
.nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  font-size: .74rem;
  letter-spacing: .06em;
}
.lang-toggle button {
  appearance: none; border: 0; background: transparent;
  padding: .3rem .68rem;
  font: inherit; color: var(--muted); cursor: pointer;
}
.lang-toggle button[aria-pressed="true"] {
  background: var(--accent); color: #fff;
}

/* Mobile menu button */
.nav-toggle {
  display: none;
  appearance: none; background: none; border: 1px solid var(--line);
  border-radius: 6px; padding: .3rem .55rem; cursor: pointer;
  font-size: 1rem; color: var(--ink);
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-block; order: 3; }
  .nav {
    order: 4;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    display: none;
    padding-bottom: .8rem;
  }
  .nav.open { display: flex; }
  .nav a { width: 100%; padding: .55rem 0; border-bottom: 1px solid var(--line); }
  .site-header .wrap { flex-wrap: wrap; padding-block: .6rem; }
}

/* --------------------------------------------------------------------- */
/* Hero                                                                   */
/* --------------------------------------------------------------------- */
.hero {
  padding: 4.5rem 0 3.5rem;
  background:
    radial-gradient(1100px 380px at 78% -12%, var(--accent-lt), transparent 70%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  line-height: 1.28;
  margin: 0 0 .9rem;
  letter-spacing: .005em;
}
.hero .lede {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 1.6rem;
}
.eyebrow {
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 .8rem;
  font-weight: 600;
}

/* --------------------------------------------------------------------- */
/* Headings                                                               */
/* --------------------------------------------------------------------- */
h2 {
  font-family: var(--serif);
  font-size: 1.55rem;
  letter-spacing: .01em;
  margin: 0 0 1.4rem;
}
h2::after {
  content: "";
  display: block;
  width: 42px; height: 2px;
  background: var(--accent);
  margin-top: .55rem;
}
h3 { font-size: 1.05rem; margin: 0 0 .4rem; letter-spacing: .01em; }

.page-title {
  padding: 2.8rem 0 2.2rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper-alt);
}
.page-title h1 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  margin: 0;
}
.page-title p { margin: .5rem 0 0; color: var(--muted); }

/* --------------------------------------------------------------------- */
/* Buttons                                                                */
/* --------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: .6rem 1.25rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  font-size: .88rem;
  letter-spacing: .03em;
  background: var(--accent);
  color: #fff;
}
.btn:hover { text-decoration: none; opacity: .9; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-lt); opacity: 1; }
.btn + .btn { margin-left: .6rem; }

/* --------------------------------------------------------------------- */
/* Cards / grids                                                          */
/* --------------------------------------------------------------------- */
.grid { display: grid; gap: var(--gap); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 860px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.4rem 1.5rem;
}
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; }
.card .tag {
  display: inline-block;
  font-size: .68rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-lt);
  padding: .18rem .5rem; border-radius: 3px;
  margin-bottom: .6rem;
}

/* --------------------------------------------------------------------- */
/* News list                                                              */
/* --------------------------------------------------------------------- */
.news { list-style: none; margin: 0; padding: 0; }
.news li {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: .8rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .94rem;
}
.news time {
  color: var(--muted);
  font-family: var(--mono);
  font-size: .8rem;
  padding-top: .18rem;
}
@media (max-width: 560px) {
  .news li { grid-template-columns: 1fr; gap: .15rem; }
}

/* --------------------------------------------------------------------- */
/* Members                                                                */
/* --------------------------------------------------------------------- */
.person { text-align: left; }
.person .photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  background: var(--accent-lt);
  margin-bottom: .75rem;
}
.person h3 { margin-bottom: .1rem; }
.person .role {
  font-size: .8rem; color: var(--accent);
  letter-spacing: .04em; margin: 0 0 .35rem;
}
.person p.bio { font-size: .88rem; color: var(--muted); margin: 0; }
.person .links { margin-top: .45rem; font-size: .8rem; }
.person .links a { margin-right: .7rem; }

.roster { list-style: none; margin: 0; padding: 0; }
.roster li {
  padding: .5rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .94rem;
}
.roster .role { color: var(--muted); font-size: .85rem; margin-left: .5rem; }

/* --------------------------------------------------------------------- */
/* Publications                                                           */
/* --------------------------------------------------------------------- */
.pub-filter {
  display: flex; flex-wrap: wrap; gap: .4rem;
  margin-bottom: 1.8rem;
}
.pub-filter button {
  appearance: none; cursor: pointer;
  border: 1px solid var(--line); background: var(--paper);
  border-radius: 999px; padding: .3rem .85rem;
  font: inherit; font-size: .8rem; color: var(--muted);
}
.pub-filter button[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

.pub-year {
  font-family: var(--serif);
  font-size: 1.15rem;
  margin: 2.2rem 0 .8rem;
  padding-bottom: .3rem;
  border-bottom: 1px solid var(--line);
}
.pub-year:first-of-type { margin-top: 0; }

ol.pubs { list-style: none; margin: 0; padding: 0; counter-reset: pub; }
ol.pubs li {
  padding: .85rem 0 .85rem 2.1rem;
  border-bottom: 1px dotted var(--line);
  position: relative;
  font-size: .95rem;
}
/* Descending numbering: put the newest paper at the top but keep the
   original ascending numbers. Set the start value per list, e.g.
   <ol class="pubs count-down" style="counter-reset: pub 54">  ->  53, 52, ... */
ol.pubs.count-down li { counter-increment: pub -1; }
ol.pubs.count-down li::before { counter-increment: unset; }

ol.pubs li::before {
  counter-increment: pub;
  content: counter(pub) ".";
  position: absolute; left: 0; top: .85rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .82rem;
}
ol.pubs .authors { color: var(--ink); }
ol.pubs .me { font-weight: 700; }
ol.pubs .title { display: block; margin: .15rem 0; }
ol.pubs .venue { color: var(--muted); font-style: italic; }
ol.pubs .meta-links { font-size: .82rem; margin-top: .25rem; }
ol.pubs .meta-links a { margin-right: .7rem; }

/* --------------------------------------------------------------------- */
/* Prose blocks                                                           */
/* --------------------------------------------------------------------- */
.prose { max-width: 70ch; }
.prose p { margin: 0 0 1.1rem; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin-bottom: .35rem; }

.figure { margin: 1.6rem 0; }
.figure img { border: 1px solid var(--line); border-radius: 8px; }
.figure figcaption {
  font-size: .82rem; color: var(--muted); margin-top: .5rem;
}

dl.facts { margin: 0; }
dl.facts dt {
  font-size: .72rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); margin-top: 1.1rem;
}
dl.facts dd { margin: .15rem 0 0; }

/* --------------------------------------------------------------------- */
/* Footer                                                                 */
/* --------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-alt);
  padding: 2.4rem 0;
  font-size: .85rem;
  color: var(--muted);
}
.site-footer .wrap {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
}
.site-footer a { color: var(--muted); }

/* --------------------------------------------------------------------- */
/* Utilities                                                              */
/* --------------------------------------------------------------------- */
.muted { color: var(--muted); }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.small { font-size: .85rem; }

.skip-link {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff; padding: .6rem 1rem;
}
.skip-link:focus { left: 1rem; top: .6rem; z-index: 100; }

@media print {
  .site-header, .site-footer, .pub-filter, .nav-toggle { display: none; }
  body { font-size: 11pt; }
}