:root{
  --ink:#1b2430; --sub:#5a6573; --line:#e3e7ec; --bg:#ffffff; --soft:#f5f7fa;
  --navy:#0f3d5e; --accent:#e08a00; --accent-soft:#fff4e0;
  --max:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.85;font-size:16px;-webkit-text-size-adjust:100%}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy)}
a:hover{color:var(--accent)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.95);
  backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.logo{font-weight:700;color:var(--navy);text-decoration:none;font-size:18px;white-space:nowrap}
.logo small{font-weight:400;color:var(--sub);font-size:12px;margin-left:8px}
nav ul{list-style:none;display:flex;gap:4px;margin:0;padding:0;flex-wrap:wrap}
nav a{display:block;padding:6px 10px;text-decoration:none;color:var(--ink);font-size:14px;border-radius:6px}
nav a:hover{background:var(--soft);color:var(--navy)}
.menu-btn{display:none}

/* hero */
.hero{background:linear-gradient(135deg,#0f3d5e 0%,#14567f 60%,#1d6f8f 100%);color:#fff;padding:88px 0 80px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,190,80,.55) 0%,rgba(255,190,80,0) 70%)}
.hero .eyebrow{letter-spacing:.15em;font-size:13px;opacity:.85;margin:0 0 8px}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.3;margin:0 0 6px}
.hero .en{font-size:16px;opacity:.85;margin:0 0 28px;letter-spacing:.05em}
.hero .catch{font-size:clamp(18px,2.6vw,24px);font-weight:700;margin:0 0 10px}
.hero .catch span{color:#ffd28a}
.hero .aff{font-size:14px;opacity:.9;margin:0}

/* sections */
section{padding:72px 0;border-bottom:1px solid var(--line)}
section.alt{background:var(--soft)}
h2{font-size:26px;margin:0 0 6px;color:var(--navy)}
h2 + .h2en{margin:0 0 32px;color:var(--accent);font-size:13px;letter-spacing:.2em;text-transform:uppercase;font-weight:700}
h3{font-size:19px;margin:36px 0 10px;color:var(--ink);border-left:4px solid var(--accent);padding-left:12px;line-height:1.5}
p{margin:0 0 1em}
.lead{font-size:17px}
figure{margin:20px 0 28px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px}
figcaption{font-size:13px;color:var(--sub);margin-top:10px}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.topics{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:24px 0}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px}
.card .tag{display:inline-block;background:var(--accent-soft);color:#9a5a00;font-weight:700;font-size:12px;border-radius:4px;padding:2px 8px;margin-bottom:8px}
.card h4{margin:0 0 6px;font-size:16px}
.card p{font-size:14px;color:var(--sub);margin:0}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
.stat{background:var(--navy);color:#fff;border-radius:10px;padding:18px 20px}
.stat b{display:block;font-size:30px;line-height:1.2;color:#ffd28a}
.stat span{font-size:13px;opacity:.9}

/* members */
.pi{display:grid;grid-template-columns:200px 1fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px}
.pi .role{color:var(--accent);font-weight:700;font-size:14px;margin:0}
.pi .name{font-size:26px;font-weight:700;margin:0}
.pi .name small{font-size:14px;color:var(--sub);font-weight:400;margin-left:8px}
.pi .avatar{width:200px;height:200px;border-radius:50%;background:linear-gradient(135deg,#dfe8f0,#c7d6e3);
  display:flex;align-items:center;justify-content:center;color:var(--navy);font-size:56px;font-weight:700}
dl.cv{display:grid;grid-template-columns:110px 1fr;gap:4px 12px;font-size:14px;margin:14px 0}
dl.cv dt{color:var(--sub)}
dl.cv dd{margin:0}
.links a{display:inline-block;margin:6px 8px 0 0;padding:6px 14px;border:1px solid var(--navy);border-radius:999px;text-decoration:none;font-size:13px}
.links a:hover{background:var(--navy);color:#fff}
.students{margin-top:24px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.student{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;text-align:center;font-size:14px}
.student b{display:block;font-size:15px}

/* publications */
ol.pubs{padding-left:1.4em;margin:0}
ol.pubs li{margin-bottom:12px;font-size:15px}
ol.pubs .j{font-style:italic}
.me{text-decoration:underline;text-underline-offset:3px}
.more{margin-top:14px}

/* equipment */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gallery figure{margin:0;padding:0;overflow:hidden}
.gallery img{aspect-ratio:4/3;object-fit:cover;width:100%}
.gallery figcaption{padding:8px 12px 12px;margin:0;color:var(--ink)}
.gallery figcaption small{display:block;color:var(--sub)}
table{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
th,td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);white-space:nowrap;font-weight:700}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:10px}

/* access */
.tbl td:first-child{white-space:nowrap}
.rooms td:first-child{font-weight:700;white-space:nowrap}
.badge{display:inline-block;font-size:12px;padding:1px 8px;border-radius:4px;background:var(--accent-soft);color:#9a5a00;margin-left:6px}

/* recruit */
.recruit{background:linear-gradient(135deg,#fff4e0,#fff);border:1px solid #f1d7a6;border-radius:12px;padding:28px}

footer{background:#0b2b42;color:#cfd9e2;padding:36px 0;font-size:13px}
footer a{color:#fff}

@media (max-width:860px){
  .grid2,.topics,.stats{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .students{grid-template-columns:repeat(2,1fr)}
  .pi{grid-template-columns:1fr;text-align:left}
  .pi .avatar{width:120px;height:120px;font-size:36px}
  nav{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line)}
  nav.open{display:block}
  nav ul{flex-direction:column;padding:8px 16px}
  .menu-btn{display:block;background:none;border:1px solid var(--line);border-radius:6px;padding:6px 10px;font-size:14px}
  section{padding:56px 0}
  .wrap{padding:0 16px}
}

.svgfig svg{width:100%;height:auto;display:block}
.svgfig{overflow:hidden}
@media (max-width:860px){.svgfig{overflow-x:auto}.svgfig svg{min-width:640px}}