:root{
  --bg:#f4f1ea;
  --paper:#fffdf8;
  --ink:#17202b;
  --muted:#66717d;
  --line:#d8d4cb;
  --accent:#0d6b68;
  --accent2:#123d5a;
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75}
a{color:inherit;text-decoration:none}
.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(244,241,234,.9);backdrop-filter:blur(12px);border-bottom:1px solid rgba(216,212,203,.8)}
.nav-wrap{height:68px;display:flex;align-items:center;justify-content:flex-end}
.brand{font-weight:800;letter-spacing:.08em;border:1px solid var(--ink);width:38px;height:38px;display:grid;place-items:center;border-radius:50%}
.nav{display:flex;gap:22px;font-size:14px}.nav a:hover{color:var(--accent)}
.hero{padding:96px 0 72px;background:linear-gradient(145deg,#f4f1ea 60%,#e7eeec)}
.hero-grid{display:grid;grid-template-columns:1.5fr .7fr;gap:80px;align-items:center}
.hero-simple{max-width:none;text-align:left}
.hero-simple h1{margin-bottom:34px}
.hero-identity{display:flex;align-items:center;justify-content:flex-start;gap:26px;margin-bottom:34px;text-align:left}
.hero-identity h1{margin:0}
.profile-photo{width:132px;height:132px;object-fit:cover;border-radius:18px;border:1px solid var(--line);box-shadow:0 10px 28px rgba(23,32,43,.08);flex:0 0 auto}
.eyebrow{font-size:12px;letter-spacing:.18em;font-weight:800;color:var(--accent);margin:0 0 12px}
h1{font-size:clamp(40px,6vw,68px);line-height:1.04;letter-spacing:-.035em;margin:0 0 24px}h1 span{font-size:.46em;letter-spacing:.08em;font-weight:600}
.lead{font-size:clamp(22px,3vw,34px);font-weight:700;margin:0 0 18px;color:var(--accent2)}
.intro{font-size:17px;max-width:700px;color:#3c4751}
.role-list{margin-top:28px;display:grid;gap:10px}.role-list div{display:grid;grid-template-columns:180px 1fr;gap:16px;border-top:1px solid var(--line);padding-top:10px}.role-list span{color:var(--muted)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}.button{border:1px solid var(--ink);padding:10px 16px;border-radius:999px;font-size:14px;font-weight:700;transition:.2s}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--ink);color:white}
.profile-card{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:0 20px 60px rgba(23,32,43,.08)}
.monogram{width:120px;height:120px;border-radius:50%;display:grid;place-items:center;background:var(--accent2);color:white;font-size:34px;font-weight:800;letter-spacing:.08em;margin-bottom:34px}.profile-label{font-size:11px;letter-spacing:.16em;color:var(--muted);font-weight:800}.profile-card ul{padding-left:18px;margin:10px 0 24px}.mini-note{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:16px}
.section{padding:90px 0}.alt{background:var(--paper)}.section-heading{max-width:720px;margin-bottom:42px}.section-heading h2,.contact h2{font-size:clamp(34px,5vw,56px);line-height:1.12;letter-spacing:-.03em;margin:0 0 14px}.section-heading p:not(.eyebrow){color:var(--muted)}
.split{max-width:none;display:flex;align-items:end;justify-content:space-between;gap:30px}.text-link{font-weight:700;color:var(--accent);white-space:nowrap}
.cards{display:grid;gap:18px}.cards.three{grid-template-columns:repeat(3,1fr)}.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:28px;min-height:280px}.card .num{display:inline-block;font-size:12px;font-weight:800;color:var(--accent);margin-bottom:54px}.card h3{font-size:24px;line-height:1.2;margin:0 0 18px}.card p{color:var(--muted);margin:0}
.pub-list{border-top:1px solid var(--line)}.pub{display:grid;grid-template-columns:100px 1fr;gap:28px;padding:28px 0;border-bottom:1px solid var(--line)}.pub-year{font-weight:800;color:var(--accent)}.pub h3{font-size:20px;line-height:1.45;margin:0 0 8px}.authors,.venue{margin:4px 0;color:var(--muted);font-size:14px}.venue{font-weight:700;color:var(--accent2)}
.timeline{border-top:1px solid var(--line)}.timeline-item{display:grid;grid-template-columns:160px 1fr;gap:35px;padding:24px 0;border-bottom:1px solid var(--line)}.timeline-item .year{font-weight:800;color:var(--accent)}.timeline-item h3{margin:0;font-size:20px}.timeline-item p{margin:4px 0 0;color:var(--muted)}
.highlight{background:var(--accent2);color:white}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.stats>div{border-right:1px solid rgba(255,255,255,.25);padding-right:20px}.stats>div:last-child{border-right:0}.stats span{font-size:64px;font-weight:800;line-height:1}.stats p{margin:8px 0 0;color:rgba(255,255,255,.72)}
.contact{background:#e7eeec}.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:80px;align-items:center}.contact-grid>div:last-child p{color:#4d5a64}
footer{padding:28px 0;background:var(--ink);color:#c9d0d5;font-size:12px}.footer-wrap{display:flex;justify-content:space-between;gap:20px}
@media (max-width:820px){.nav{display:none}.hero{padding-top:62px}.hero-grid,.contact-grid{grid-template-columns:1fr;gap:42px}.profile-card{max-width:520px}.cards.three{grid-template-columns:1fr}.card{min-height:auto}.role-list div{grid-template-columns:1fr;gap:2px}.timeline-item{grid-template-columns:105px 1fr}.stats{grid-template-columns:1fr}.stats>div{border-right:0;border-bottom:1px solid rgba(255,255,255,.25);padding:20px 0}.stats>div:last-child{border-bottom:0}.split{align-items:flex-start;flex-direction:column}.footer-wrap{flex-direction:column}}
@media (max-width:520px){.container{width:min(var(--max),calc(100% - 28px))}.section{padding:66px 0}.pub{grid-template-columns:1fr;gap:4px}.timeline-item{grid-template-columns:1fr;gap:4px}.monogram{width:92px;height:92px}.hero-identity{gap:16px;align-items:center}.profile-photo{width:76px;height:76px;border-radius:14px}}

/* Header language switch */
.header-right{display:flex;align-items:center;gap:24px}
.lang-switch{display:flex;align-items:center;gap:6px;padding:4px;border:1px solid var(--line);border-radius:999px;background:var(--paper);font-size:12px;font-weight:700;white-space:nowrap}
.lang-switch a,.lang-switch span{padding:5px 9px;border-radius:999px}
.lang-switch a:hover{color:var(--accent)}
.lang-switch .active{background:var(--ink);color:white}
@media (max-width:820px){.header-right{gap:10px}.lang-switch{font-size:11px}}


/* Detailed works pages */
.narrow{max-width:920px}
.subpage-hero{padding:72px 0 52px;background:linear-gradient(145deg,#f4f1ea 62%,#e7eeec)}
.back-link{display:inline-block;margin-bottom:34px;color:var(--muted);font-size:14px;font-weight:700}
.back-link:hover{color:var(--accent)}
.page-title{font-size:clamp(54px,9vw,96px);margin-bottom:22px}
.page-intro{font-size:17px;max-width:760px;color:#3c4751;margin:0}
.metrics{display:grid;gap:12px;margin-top:38px}.metrics.four{grid-template-columns:repeat(4,1fr)}
.metrics>div{background:rgba(255,253,248,.72);border:1px solid var(--line);border-radius:15px;padding:17px 18px;display:flex;flex-direction:column;gap:2px}
.metrics strong{font-size:30px;line-height:1.1;color:var(--accent2)}.metrics span{font-size:12px;color:var(--muted);font-weight:700}
.jump-nav{display:flex;flex-wrap:wrap;gap:9px;margin-top:20px}
.jump-nav a{border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:7px 12px;font-size:13px;font-weight:700}
.jump-nav a:hover{border-color:var(--accent);color:var(--accent)}
.works-section{scroll-margin-top:68px}
.work-list{border-top:1px solid var(--line)}
.work-item{display:grid;grid-template-columns:120px 1fr;gap:30px;padding:30px 0;border-bottom:1px solid var(--line)}
.work-date{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:.02em;padding-top:3px;overflow-wrap:anywhere}
.work-item h3{font-size:20px;line-height:1.48;margin:0 0 9px;letter-spacing:-.01em}
.work-item .authors{font-size:14px;line-height:1.7;margin:0;color:var(--muted)}
.work-item .venue{font-size:14px;margin:6px 0 0;font-weight:700;color:var(--accent2)}
.badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.badges span{font-size:11px;font-weight:800;color:var(--accent);border:1px solid rgba(13,107,104,.28);background:rgba(13,107,104,.055);padding:3px 8px;border-radius:999px}
.work-list.compact .work-item{padding:24px 0}.work-list.compact .work-item h3{font-size:18px}
.patent-list .work-date{font-size:12px}
.society-card{border:1px solid var(--line);background:var(--paper);border-radius:16px;padding:24px;font-size:20px;font-weight:800}
.source-note{margin-top:30px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.source-note a{text-decoration:underline;text-underline-offset:3px}
.nav a[aria-current="page"]{color:var(--accent);font-weight:800}
@media (max-width:820px){.metrics.four{grid-template-columns:repeat(2,1fr)}.work-item{grid-template-columns:1fr;gap:5px}.work-date{padding-top:0}.subpage-hero{padding-top:52px}}
@media (max-width:520px){.metrics.four{grid-template-columns:1fr 1fr}.page-title{font-size:52px}.jump-nav a{font-size:12px}.work-item h3{font-size:18px}}

/* Icon-only email button */
.icon-button{width:42px;height:42px;padding:0;display:inline-grid;place-items:center;border-radius:50%}
.icon-button svg{width:19px;height:19px;display:block}

/* Publication links */
.paper-link{color:inherit;text-decoration-thickness:1px;text-decoration-color:transparent;text-underline-offset:4px;transition:color .18s,text-decoration-color .18s}
.paper-link::after{content:" ↗";font-size:.72em;color:var(--accent);font-weight:800;white-space:nowrap}
.paper-link:hover{color:var(--accent2);text-decoration:underline;text-decoration-color:var(--accent)}


/* Profile links */
.profile-links{align-items:center}
.profile-icon-link{width:44px;height:44px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:var(--paper);transition:transform .18s,border-color .18s,box-shadow .18s}
.profile-icon-link:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 22px rgba(23,32,43,.08)}
.profile-icon-link svg{width:20px;height:20px;display:block}


/* Research overview */
.research-grid{display:grid;grid-template-columns:minmax(0,.82fr) minmax(420px,1.18fr);gap:64px;align-items:center}
.research-copy .section-heading{max-width:620px;margin-bottom:0}
.research-keyword-block{margin-top:30px}
.keyword-label{margin:0 0 10px;font-size:11px;line-height:1.2;letter-spacing:.16em;font-weight:800;color:var(--muted)}
.research-keywords{display:flex;flex-wrap:wrap;gap:9px;list-style:none;padding:0;margin:0}
.research-keywords li{padding:8px 13px;border:1px solid rgba(13,107,104,.25);border-radius:999px;background:rgba(13,107,104,.055);color:var(--accent2);font-size:13px;font-weight:750;line-height:1.35}
.research-visual{position:relative;margin:0;padding:10px;background:rgba(255,253,248,.78);border:1px solid var(--line);border-radius:24px;box-shadow:0 20px 55px rgba(23,32,43,.09);overflow:hidden}
.research-visual::after{content:"";position:absolute;inset:auto 12% -28px 12%;height:58px;background:rgba(13,107,104,.13);filter:blur(30px);pointer-events:none}
.research-visual picture,.research-visual img{display:block;width:100%}
.research-visual img{height:auto;border-radius:16px}
.image-credit{position:relative;z-index:1;margin:8px 6px 2px;text-align:right;color:var(--muted);font-size:11px;line-height:1.4;letter-spacing:.01em}

/* Site footer */
.site-footer{padding:26px 0;background:var(--ink);color:#c9d0d5;font-size:12px}
.site-footer .footer-wrap{align-items:center}
.site-footer p{margin:0;letter-spacing:.025em}

@media (max-width:900px){
  .research-grid{grid-template-columns:1fr;gap:38px}
  .research-copy .section-heading{max-width:720px}
  .research-visual{max-width:760px}
}
@media (max-width:520px){
  .research-keyword-block{margin-top:24px}
  .research-keywords{gap:7px}
  .research-keywords li{padding:7px 11px;font-size:12px}
  .research-visual{padding:6px;border-radius:18px}
  .research-visual img{border-radius:13px}
}

.inline-link{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:rgba(13,107,104,.38);transition:color .18s,text-decoration-color .18s}
.inline-link:hover{color:var(--accent);text-decoration-color:var(--accent)}