:root{
  --navy:#0f2547;
  --navy-deep:#081729;
  --navy-mid:#1c3a6e;
  --accent:#3f7cc4;
  --accent-light:#8db4dd;
  --paper:#f7f6f1;
  --paper-warm:#efece2;
  --ink:#1a1d24;
  --ink-soft:#4a4f5a;
  --line:#d9d6cb;
  --gold:#b08d4c;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Zen Kaku Gothic New',sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.9;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:'Zen Old Mincho',serif;font-weight:700;line-height:1.4}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ---------- header ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(247,246,241,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:1180px;margin:0 auto;padding:0 28px;
  height:74px;display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;flex-direction:column;line-height:1.25}
.brand .jp{font-family:'Zen Old Mincho',serif;font-weight:900;font-size:18px;color:var(--navy);letter-spacing:.04em}
.brand .en{font-family:'Cormorant Garamond',serif;font-size:11px;letter-spacing:.22em;color:var(--ink-soft);text-transform:uppercase}
nav ul{display:flex;list-style:none;gap:4px;align-items:center}
nav button.navlink{
  background:none;border:none;cursor:pointer;
  font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:13.5px;color:var(--ink-soft);
  padding:9px 14px;border-radius:3px;transition:.2s;letter-spacing:.02em;
}
nav button.navlink:hover{color:var(--navy);background:var(--paper-warm)}
nav button.navlink.active{color:var(--navy);font-weight:700}
nav button.navlink.active::after{
  content:"";display:block;height:2px;background:var(--accent);
  margin-top:4px;border-radius:2px;
}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:8px}
.menu-toggle span{width:24px;height:2px;background:var(--navy);display:block}

/* ---------- page system ---------- */
.page{display:none;animation:fade .5s ease}
.page.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
main{padding-top:74px}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

/* section heading */
.sec-head{margin:0 0 44px}
.sec-head .en{
  font-family:'Cormorant Garamond',serif;font-style:italic;
  font-size:15px;letter-spacing:.12em;color:var(--accent);
}
.sec-head h2{font-size:30px;color:var(--navy);margin-top:2px}
.sec-head .rule{width:54px;height:3px;background:var(--gold);margin-top:14px}

/* ---------- HERO ---------- */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,var(--navy-deep) 0%,var(--navy) 55%,var(--navy-mid) 100%);
  color:#fff;
}
.hero-net{position:absolute;inset:0;opacity:.5}
.hero-net-canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.65}
.hero-inner{
  max-width:1180px;margin:0 auto;padding:120px 28px 110px;
  position:relative;z-index:2;
}
.hero .en-tag{
  font-family:'Cormorant Garamond',serif;font-style:italic;font-size:19px;
  letter-spacing:.1em;color:var(--accent-light);margin-bottom:18px;
}
.hero h1{
  font-size:46px;font-weight:900;letter-spacing:.02em;color:#fff;
  line-height:1.5;
}
.hero h1 .glow{color:var(--accent-light)}
.hero p.lead{
  margin-top:26px;max-width:620px;font-size:15.5px;color:#cdd6e4;line-height:2;
}
.hero .affil{
  margin-top:34px;font-size:13px;letter-spacing:.08em;color:#9fb0c8;
  border-left:2px solid var(--gold);padding-left:14px;
}
.hero-cta{margin-top:38px;display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:13px 30px;border-radius:3px;font-size:13.5px;
  letter-spacing:.05em;cursor:pointer;border:1px solid transparent;transition:.2s;
  font-family:'Zen Kaku Gothic New',sans-serif;
}
.btn-primary{background:var(--gold);color:#fff}
.btn-primary:hover{background:#c79f5b}
.btn-ghost{border:1px solid #4a6189;color:#dbe4f1}
.btn-ghost:hover{background:rgba(255,255,255,.08)}

/* ---------- generic blocks ---------- */
section.block{padding:78px 0}
section.block.alt{background:var(--paper-warm)}
section.block.dark{background:var(--navy);color:#e6ebf3}
section.block.dark .sec-head h2{color:#fff}
section.block.dark .sec-head .en{color:var(--accent-light)}

/* concept */
.concept-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.concept-text p{margin-bottom:16px;color:var(--ink-soft)}
.concept-text p strong{color:var(--navy);font-weight:700}
.concept-visual{
  aspect-ratio:1/1;border-radius:6px;position:relative;overflow:hidden;
  background:linear-gradient(150deg,var(--navy) 0%,var(--navy-mid) 100%);
  box-shadow:0 24px 50px -22px rgba(15,37,71,.55);
}

/* theme cards */
.theme-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:8px}
.theme-card{
  background:#fff;border:1px solid var(--line);border-radius:5px;
  padding:30px 26px;transition:.25s;position:relative;overflow:hidden;
}
.theme-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:.3s;
}
.theme-card:hover{transform:translateY(-5px);box-shadow:0 18px 38px -20px rgba(15,37,71,.4)}
.theme-card:hover::before{transform:scaleX(1)}
.theme-card .no{
  font-family:'Cormorant Garamond',serif;font-size:30px;color:var(--accent-light);
  font-style:italic;
}
.theme-card h3{font-size:17px;color:var(--navy);margin:6px 0 12px}
.theme-card p{font-size:13.5px;color:var(--ink-soft);line-height:1.95}

/* PI research blocks */
.pi-block{
  background:#fff;border:1px solid var(--line);border-radius:6px;
  padding:34px 36px;margin-bottom:24px;position:relative;
  border-left:4px solid var(--accent);
}
.pi-head{margin-bottom:14px}
.pi-badge{
  font-family:'Cormorant Garamond',serif;font-style:italic;
  font-size:13px;letter-spacing:.1em;color:var(--accent);
}
.pi-head h3{font-size:21px;color:var(--navy);margin:4px 0 4px}
.pi-by{font-size:13px;color:var(--gold);font-weight:700}
.pi-text{font-size:14px;color:var(--ink-soft);line-height:2}
.kw-row{margin-top:16px;display:flex;gap:9px;flex-wrap:wrap}
.kw{
  background:var(--paper-warm);border:1px solid var(--line);
  padding:5px 14px;border-radius:30px;font-size:12px;color:var(--navy-mid);
}
.kw-big{padding:9px 20px;font-size:13.5px;background:#fff}

/* news / activity */
.news-list{border-top:1px solid var(--line)}
.news-item{
  display:grid;grid-template-columns:130px 96px 1fr;gap:20px;align-items:baseline;
  padding:20px 6px;border-bottom:1px solid var(--line);transition:.18s;
}
.news-item:hover{background:#fff;padding-left:14px}
.news-date{font-family:'Cormorant Garamond',serif;font-size:15px;color:var(--ink-soft);letter-spacing:.03em}
.news-tag{
  font-size:11px;text-align:center;padding:3px 0;border-radius:2px;
  letter-spacing:.04em;font-weight:500;
}
.tag-news{background:#e7eef7;color:var(--navy-mid)}
.tag-award{background:#f6eede;color:var(--gold)}
.tag-event{background:#e6f0ea;color:#3c7a55}
.tag-staff{background:#ece6f2;color:#5b4a86}
.news-text{font-size:14px}

/* publications */
.pub-meta{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  background:#fff;border:1px solid var(--line);border-radius:5px;
  padding:14px 20px;margin-bottom:26px;font-size:12.5px;color:var(--ink-soft);
}
.pub-meta .dot{width:7px;height:7px;border-radius:50%;background:#5aa06b;display:inline-block}
.pub-meta code{
  background:var(--paper-warm);padding:2px 8px;border-radius:3px;
  font-size:11.5px;color:var(--navy-mid);
}
.orcid-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.orcid-chip{
  background:#fff;border:1px solid var(--line);border-radius:4px;
  padding:7px 14px;font-size:12px;color:var(--ink);
}
.orcid-chip code{
  background:#eaf1f8;color:var(--accent);padding:2px 7px;
  border-radius:3px;font-size:11px;margin-left:6px;
}
.orcid-chip.pending code{background:#f6eede;color:var(--gold)}
.scholar-row{
  display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:8px;
}
.scholar-label{font-size:12.5px;color:var(--ink-soft)}
.scholar-btn{
  background:#fff;border:1px solid var(--accent-light);border-radius:30px;
  padding:6px 16px;font-size:12px;color:var(--accent);transition:.2s;
}
.scholar-btn:hover{background:var(--accent);color:#fff}
.scholar-pending{
  border-color:var(--line);color:var(--ink-soft);cursor:default;
}
.scholar-pending:hover{background:#fff;color:var(--ink-soft)}
.year-group{margin-bottom:34px}
.year-label{
  font-family:'Cormorant Garamond',serif;font-size:26px;color:var(--accent);
  border-bottom:2px solid var(--line);padding-bottom:6px;margin-bottom:14px;
}
.pub-item{padding:16px 4px;border-bottom:1px solid var(--line);display:flex;gap:16px}
.pub-item:last-child{border-bottom:none}
.pub-num{
  font-family:'Cormorant Garamond',serif;color:var(--accent-light);
  font-size:18px;flex-shrink:0;width:30px;
}
.pub-body .pt{font-size:14px;font-weight:500;color:var(--ink);margin-bottom:3px}
.pub-body .pa{font-size:12.5px;color:var(--ink-soft)}
.pub-body .pj{font-size:12.5px;color:var(--accent);font-style:italic;font-family:'Cormorant Garamond',serif;margin-top:2px}
.pub-body .plink{font-size:11.5px;color:var(--ink-soft);margin-top:5px}
.pub-body .plink a{color:var(--accent);border-bottom:1px solid var(--accent-light)}

/* members */
.member-row{display:flex;gap:26px;flex-wrap:wrap}
.member-card{
  background:#fff;border:1px solid var(--line);border-radius:6px;
  width:calc(33.333% - 18px);overflow:hidden;transition:.25s;
}
.member-card:hover{transform:translateY(-4px);box-shadow:0 16px 34px -20px rgba(15,37,71,.4)}
.member-photo{
  height:170px;background:linear-gradient(150deg,var(--navy-mid),var(--accent));
  display:flex;align-items:center;justify-content:center;
}
.member-photo span{
  font-family:'Zen Old Mincho',serif;font-size:40px;color:rgba(255,255,255,.85);
}
.member-info{padding:20px}
.member-info .role{font-size:11.5px;letter-spacing:.1em;color:var(--accent);font-weight:700}
.member-info .mname{font-family:'Zen Old Mincho',serif;font-size:19px;color:var(--navy);margin:4px 0 2px}
.member-info .mname small{font-size:11px;color:var(--ink-soft);font-family:'Cormorant Garamond',serif;letter-spacing:.08em}
.member-info .mfield{font-size:12.5px;color:var(--ink-soft);margin-top:8px}
.member-link{
  display:inline-block;margin-top:10px;font-size:11.5px;
  color:var(--accent);border-bottom:1px solid var(--accent-light);
}

/* donut charts */
.chart-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.chart-card{
  background:#fff;border:1px solid var(--line);border-radius:6px;padding:28px 30px;
}
.chart-title{font-size:15px;color:var(--navy);margin-bottom:18px}
.chart-flex{display:flex;align-items:center;gap:26px}
.donut{width:160px;height:160px;flex-shrink:0}
.legend{display:flex;flex-direction:column;gap:9px}
.legend-item{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--ink-soft)}
.legend-dot{width:13px;height:13px;border-radius:3px;flex-shrink:0}
.legend-item b{color:var(--ink)}
.grade-stats{display:flex;gap:14px}
.grade-stat{
  flex:1;text-align:center;background:var(--paper);
  border:1px solid var(--line);border-radius:6px;padding:20px 8px;
}
.grade-num{
  display:block;font-family:'Cormorant Garamond',serif;
  font-size:38px;color:var(--accent);line-height:1;
}
.grade-lbl{display:block;font-size:12px;color:var(--ink-soft);margin-top:8px}
.grade-lbl small{font-size:10.5px;color:var(--accent)}

/* access */
.access-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.map-frame{border:0;width:100%;height:340px;border-radius:6px;filter:grayscale(.2)}
.access-table{width:100%;border-collapse:collapse;font-size:13.5px}
.access-table th{
  text-align:left;width:96px;color:var(--navy);font-weight:700;
  padding:13px 10px;border-bottom:1px solid var(--line);vertical-align:top;
}
.access-table td{padding:13px 10px;border-bottom:1px solid var(--line);color:var(--ink-soft)}

/* career */
.career-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:34px}
.career-cat{
  background:#fff;border:1px solid var(--line);border-radius:6px;
  padding:24px 24px;border-top:3px solid var(--accent);transition:.25s;
}
.career-cat:hover{transform:translateY(-4px);box-shadow:0 16px 32px -20px rgba(15,37,71,.4)}
.career-cat h3{font-size:16px;color:var(--navy);margin-bottom:8px}
.career-cat p{font-size:13px;color:var(--ink-soft);line-height:1.9}
.career-note{
  background:var(--navy);color:#dfe6f0;border-radius:6px;padding:32px 34px;
  border-left:4px solid var(--gold);
}
.career-note h3{color:#fff;font-size:17px;margin-bottom:10px}
.career-note p{font-size:13.5px;color:#aab8cc;line-height:2}

/* recruit */
.recruit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:34px}
.recruit-card{
  background:var(--navy);color:#dfe6f0;border-radius:6px;padding:30px 26px;
  border-top:3px solid var(--gold);
}
.recruit-card h3{color:#fff;font-size:17px;margin-bottom:10px}
.recruit-card p{font-size:13px;color:#aab8cc;line-height:1.95}
.recruit-cta{
  background:var(--paper-warm);border-radius:6px;padding:34px;text-align:center;
}
.recruit-cta h3{color:var(--navy);font-size:20px;margin-bottom:10px}
.recruit-cta p{font-size:13.5px;color:var(--ink-soft);margin-bottom:20px}

/* social strip */
.social-strip{
  display:flex;gap:16px;flex-wrap:wrap;justify-content:center;margin-top:30px;
}
.social-btn{
  display:flex;align-items:center;gap:10px;padding:13px 24px;border-radius:4px;
  font-size:13px;letter-spacing:.04em;transition:.2s;border:1px solid var(--line);
  background:#fff;
}
.social-btn:hover{transform:translateY(-3px);box-shadow:0 12px 26px -16px rgba(15,37,71,.4)}
.social-btn .ic{
  width:34px;height:34px;border-radius:8px;display:flex;align-items:center;
  justify-content:center;color:#fff;font-family:'Cormorant Garamond',serif;font-size:18px;
}
.ic-insta{background:linear-gradient(45deg,#f09433,#e6683c,#dc2743,#bc1888)}
.ic-univ{background:var(--navy)}
.ic-gyoseki{background:var(--gold)}
.ic-x{background:#111}

/* footer */
footer{background:var(--navy-deep);color:#9fb0c8;padding:50px 0 28px}
.foot-inner{max-width:1180px;margin:0 auto;padding:0 28px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px}
.foot-brand .jp{font-family:'Zen Old Mincho',serif;font-size:18px;color:#fff;font-weight:900}
.foot-brand .en{font-family:'Cormorant Garamond',serif;font-size:11px;letter-spacing:.2em;color:var(--accent-light)}
.foot-nav{display:flex;gap:40px;flex-wrap:wrap}
.foot-col h4{font-size:11px;letter-spacing:.12em;color:var(--accent-light);margin-bottom:12px}
.foot-col button{
  display:block;background:none;border:none;color:#9fb0c8;cursor:pointer;
  font-size:12.5px;padding:4px 0;font-family:'Zen Kaku Gothic New',sans-serif;text-align:left;
}
.foot-col button:hover{color:#fff}
.foot-bottom{
  max-width:1180px;margin:34px auto 0;padding:20px 28px 0;
  border-top:1px solid #1c3050;font-size:11px;color:#62748f;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}

/* note banner (prototype) */
.proto-note{
  background:#fff7e6;border-bottom:1px solid #f0dcae;color:#8a6a2a;
  font-size:12px;text-align:center;padding:7px 16px;letter-spacing:.02em;
}

@media(max-width:880px){
  .nav-inner{height:64px}
  nav ul{
    position:fixed;top:64px;left:0;right:0;background:var(--paper);
    flex-direction:column;align-items:stretch;gap:0;
    border-bottom:1px solid var(--line);padding:8px 16px 16px;
    display:none;
  }
  nav ul.open{display:flex}
  nav button.navlink{padding:13px 8px;text-align:left;width:100%}
  nav button.navlink.active::after{display:none}
  .menu-toggle{display:flex}
  main{padding-top:64px}
  .hero h1{font-size:31px}
  .hero-inner{padding:80px 24px 70px}
  .concept-grid,.access-grid{grid-template-columns:1fr;gap:30px}
  .theme-grid,.recruit-grid,.career-grid,.chart-grid{grid-template-columns:1fr}
  .chart-flex{flex-direction:column;align-items:flex-start}
  .member-card{width:100%}
  .news-item{grid-template-columns:84px 1fr;gap:8px 14px}
  .news-tag{grid-row:1;grid-column:2;justify-self:start;padding:3px 12px}
  .news-text{grid-column:1/-1}
  .foot-bottom{flex-direction:column}
}

/* ---- 複数ページ構成への追加スタイル ---- */
main{padding-top:74px}
@media(max-width:880px){main{padding-top:64px}}

/* ナビリンク（aタグ版） */
nav ul{display:flex;list-style:none;gap:4px;align-items:center;margin:0;padding:0}
nav ul li{margin:0}
a.navlink{
  display:block;font-family:'Zen Kaku Gothic New',sans-serif;
  font-size:13.5px;color:var(--ink-soft);padding:9px 14px;
  border-radius:3px;transition:.2s;letter-spacing:.02em;text-decoration:none;
}
a.navlink:hover{color:var(--navy);background:var(--paper-warm)}
a.navlink.active{color:var(--navy);font-weight:700}
a.navlink.active::after{content:"";display:block;height:2px;background:var(--accent);margin-top:4px;border-radius:2px;}

/* フッターリンク（aタグ版） */
.foot-col a{display:block;color:#9fb0c8;font-size:12.5px;padding:4px 0;text-decoration:none;font-family:'Zen Kaku Gothic New',sans-serif;}
.foot-col a:hover{color:#fff}

/* カテゴリフィルター */
.cat-filter{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.cat-filter-btn{
  font-size:12.5px;padding:6px 16px;border-radius:30px;
  border:1px solid var(--line);background:#fff;color:var(--ink-soft);
  cursor:pointer;transition:.2s;font-family:'Zen Kaku Gothic New',sans-serif;
}
.cat-filter-btn:hover,.cat-filter-btn.active{border-color:var(--accent);color:var(--accent)}
.cat-filter-btn.active{background:var(--accent);color:#fff}

/* pub関連 */
.pub-loading{font-size:13px;color:var(--ink-soft);padding:20px 0}
.pub-error{font-size:13px;color:#9a4a3a;background:#f8ece9;border:1px solid #e6c9c2;border-radius:5px;padding:14px 18px;margin-bottom:16px}
.pub-badge-manual{display:inline-block;font-size:10px;background:var(--paper-warm);color:var(--gold);border:1px solid var(--line);border-radius:3px;padding:1px 7px;margin-left:8px;vertical-align:middle}

@media(max-width:880px){
  nav ul{position:fixed;top:64px;left:0;right:0;background:var(--paper);flex-direction:column;align-items:stretch;gap:0;border-bottom:1px solid var(--line);padding:8px 16px 16px;display:none}
  nav ul.open{display:flex}
  a.navlink{padding:13px 8px;width:100%}
  a.navlink.active::after{display:none}
  .chart-grid,.access-grid{grid-template-columns:1fr}
  .career-grid,.recruit-grid{grid-template-columns:1fr}
}