:root{
  --navy:#0b1f3a;
  --navy2:#122c50;
  --accent:#2dd4bf;
  --accent2:#38bdf8;
  --text:#1e293b;
  --muted:#64748b;
  --bg:#f8fafc;
  --card:#ffffff;
  --border:#e2e8f0;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic UI","Noto Sans JP",Meiryo,sans-serif;color:var(--text);background:var(--bg);line-height:1.8}

/* ===== Header ===== */
header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(11,31,58,.92);backdrop-filter:blur(10px)}
.nav-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 24px}
.logo{color:#fff;font-weight:700;font-size:1.25rem;letter-spacing:.05em;text-decoration:none}
.logo span{color:var(--accent)}
nav ul{display:flex;gap:24px;list-style:none;align-items:center}
nav a{color:#cbd5e1;text-decoration:none;font-size:.92rem;transition:.2s}
nav a:hover{color:var(--accent)}
nav a.active{color:var(--accent);font-weight:700}
.menu-btn{display:none;background:none;border:none;color:#fff;font-size:1.6rem;cursor:pointer}

/* ===== Hero (home) ===== */
.hero{min-height:88vh;display:flex;align-items:center;background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 55%,#0e3a5c 100%);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(45,212,191,.18),transparent 70%);top:-180px;right:-120px}
.hero::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(56,189,248,.14),transparent 70%);bottom:-140px;left:-80px}
.hero-inner{max-width:1100px;margin:0 auto;padding:120px 24px 80px;position:relative;z-index:1;display:flex;align-items:center;gap:56px}
.hero-logo{flex-shrink:0;width:380px;max-width:42vw}
.hero-logo img{width:100%;height:auto;display:block;filter:drop-shadow(0 8px 30px rgba(45,212,191,.22))}
.hero-text{flex:1;min-width:0}
.hero .tag{display:inline-block;border:1px solid var(--accent);color:var(--accent);border-radius:999px;padding:4px 16px;font-size:.85rem;letter-spacing:.1em;margin-bottom:22px}
.hero h1{color:#fff;font-size:clamp(1.9rem,5vw,3.2rem);font-weight:800;line-height:1.35;letter-spacing:.02em}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:#94a3b8;margin-top:22px;max-width:640px;font-size:1.02rem}
.hero .btns{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 30px;border-radius:999px;text-decoration:none;font-weight:600;font-size:.95rem;transition:.25s}
.btn-primary{background:linear-gradient(90deg,var(--accent),var(--accent2));color:var(--navy)}
.btn-primary:hover{opacity:.85;transform:translateY(-2px)}
.btn-ghost{border:1px solid #475569;color:#e2e8f0}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ===== Page hero (subpages) ===== */
.page-hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 60%,#0e3a5c 100%);padding:130px 24px 56px;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(45,212,191,.16),transparent 70%);top:-140px;right:-80px}
.page-hero .container{position:relative;z-index:1}
.page-hero .sec-label{color:var(--accent)}
.page-hero h1{color:#fff;font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;margin-top:6px}
.page-hero p{color:#94a3b8;margin-top:12px;max-width:680px;font-size:.98rem}

/* ===== Sections ===== */
section{padding:90px 24px}
.container{max-width:1100px;margin:0 auto}
.sec-label{color:var(--accent2);font-weight:700;letter-spacing:.18em;font-size:.8rem;text-transform:uppercase}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:800;margin:8px 0 40px;color:var(--navy)}
h2::after{content:"";display:block;width:56px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--accent2));margin-top:12px}
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;gap:12px}

/* Cards */
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:30px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(11,31,58,.10)}
a.card{display:block;text-decoration:none;color:inherit}
.card .icon{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;background:linear-gradient(135deg,rgba(45,212,191,.15),rgba(56,189,248,.15));margin-bottom:18px}
.card h3{font-size:1.1rem;color:var(--navy);margin-bottom:10px}
.card p{font-size:.93rem;color:var(--muted)}
.card .cta{display:inline-block;margin-top:14px;color:var(--accent2);font-weight:700;font-size:.9rem}
.keywords{margin-top:34px;display:flex;gap:10px;flex-wrap:wrap}
.kw{background:#e6fbf8;color:#0f766e;border-radius:999px;padding:5px 16px;font-size:.85rem;font-weight:600}

/* Members */
.member{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:34px;display:flex;gap:30px;align-items:flex-start;flex-wrap:wrap}
.member-info{flex:1;min-width:260px}
.member-info h3{font-size:1.3rem;color:var(--navy)}
.member-info .role{color:var(--accent2);font-weight:600;font-size:.9rem;margin-bottom:10px}
.member-info p{font-size:.93rem;color:var(--muted)}
.member-links{margin-top:12px;display:flex;gap:18px;flex-wrap:wrap}
.member-links a{color:var(--accent2);font-size:.9rem;text-decoration:none;font-weight:600}
.member-links a:hover{text-decoration:underline}
.recruit{margin-top:24px;border:2px dashed #94d8cf;border-radius:16px;padding:30px;text-align:center;color:var(--muted);background:#f0fdfa}
.recruit strong{color:#0f766e;display:block;font-size:1.05rem;margin-bottom:6px}

/* Timeline */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--accent),var(--accent2))}
.tl-item{position:relative;padding-bottom:26px}
.tl-item::before{content:"";position:absolute;left:-28px;top:8px;width:14px;height:14px;border-radius:50%;background:#fff;border:3px solid var(--accent)}
.tl-item .date{font-size:.83rem;color:var(--accent2);font-weight:700}
.tl-item .body{font-size:.95rem}
.cv-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.cv-grid h3, .cv-h3{color:var(--navy);font-size:1.05rem;margin-bottom:22px;padding-left:12px;border-left:4px solid var(--accent)}

/* Publications */
.pub-list{list-style:none}
.pub-list li{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px 22px;margin-bottom:12px;transition:.2s}
.pub-list li:hover{border-color:var(--accent)}
.pub-list .title{font-weight:700;color:var(--navy);font-size:.97rem}
.pub-list .meta{font-size:.85rem;color:var(--muted);margin-top:4px}
.pub-list .journal{color:#0f766e;font-weight:600}
.award-list li{border-left:4px solid #f59e0b}
.more-link{display:inline-block;margin-top:18px;color:var(--accent2);font-weight:700;text-decoration:none}
.more-link:hover{text-decoration:underline}
.year-head{display:flex;align-items:center;gap:16px;margin:44px 0 18px}
.year-head .year{font-size:1.6rem;font-weight:800;color:var(--navy)}
.year-head .line{flex:1;height:2px;background:linear-gradient(90deg,var(--accent),transparent)}
.rm-note{background:#eef6ff;border:1px solid #bfdbfe;border-radius:12px;padding:18px 24px;font-size:.93rem;color:#1e40af;margin-top:28px}
.rm-note a{color:#1d4ed8;font-weight:700}

/* News */
.news-list{list-style:none;border-top:1px solid var(--border)}
.news-list li{display:flex;gap:24px;padding:18px 6px;border-bottom:1px solid var(--border);align-items:baseline;flex-wrap:wrap}
.news-list .date{color:var(--accent2);font-weight:700;font-size:.88rem;min-width:100px}
.news-list .cat{background:var(--navy);color:#fff;font-size:.72rem;border-radius:4px;padding:2px 10px;letter-spacing:.05em}
.news-list .cat.award{background:#f59e0b}
.news-list .txt{font-size:.95rem;flex:1;min-width:200px}
.news-list .txt a{color:inherit;text-decoration:none}
.news-list .txt a:hover{color:var(--accent2)}

/* News post cards (news.html) */
.post{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden;display:flex;gap:0;margin-bottom:26px;flex-wrap:wrap;transition:.2s}
.post:hover{box-shadow:0 10px 26px rgba(11,31,58,.08)}
.post .post-photo{width:300px;min-height:210px;flex-shrink:0;display:flex}
.post .post-photo .ph{border-radius:0;border:none;border-right:2px dashed #cbd5e1;flex:1}
.post .post-photo img{width:100%;height:100%;object-fit:cover}
.post .post-body{flex:1;min-width:260px;padding:26px 30px}
.post .post-meta{display:flex;gap:14px;align-items:center;margin-bottom:8px}
.post .post-meta .date{color:var(--accent2);font-weight:700;font-size:.88rem}
.post .post-meta .cat{background:var(--navy);color:#fff;font-size:.72rem;border-radius:4px;padding:2px 10px}
.post .post-meta .cat.award{background:#f59e0b}
.post h3{color:var(--navy);font-size:1.08rem;margin-bottom:8px}
.post p{font-size:.93rem;color:var(--muted)}

/* Research detail (research.html) */
.theme{background:var(--card);border:1px solid var(--border);border-radius:20px;padding:44px;margin-bottom:44px}
.theme .theme-head{display:flex;align-items:center;gap:18px;margin-bottom:20px}
.theme .icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.7rem;background:linear-gradient(135deg,rgba(45,212,191,.15),rgba(56,189,248,.15));flex-shrink:0}
.theme h2{margin:0}
.theme h2::after{display:none}
.theme-body{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:start;margin-top:10px}
.theme-body p{font-size:.96rem;margin-bottom:14px}
.theme .cv-h3{margin-top:34px}

/* Contact */
.contact-sec{background:linear-gradient(135deg,var(--navy),#0e3a5c);color:#e2e8f0}
.contact-sec h2{color:#fff}
.contact-sec .sec-label{color:var(--accent)}
.contact-box{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-top:10px}
.contact-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:26px}
.contact-card h3{color:var(--accent);font-size:1rem;margin-bottom:10px}
.contact-card p{font-size:.92rem;color:#cbd5e1}
.contact-card a{color:var(--accent2);text-decoration:none}
.contact-card a:hover{text-decoration:underline}
.map-wrap{margin-top:36px;border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.15)}
.map-wrap iframe{display:block;width:100%;height:380px;border:0}

/* News + SNS 2カラム */
.news-sns{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:start}
.sns-col{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:20px;max-height:640px;overflow-y:auto}
.sns-col .twitter-tweet{margin:0 auto !important}
.sns-fallback{text-align:center;margin-top:14px}
@media (max-width:900px){.news-sns{grid-template-columns:1fr}}
.x-btn{display:inline-flex;align-items:center;gap:8px;background:#000;color:#fff !important;border-radius:999px;padding:8px 20px;font-size:.88rem;font-weight:700;text-decoration:none;transition:.2s}
.x-btn:hover{opacity:.8}
.x-btn .x-mark{font-weight:900;font-size:1rem}

/* Photo placeholders */
.ph{background:repeating-linear-gradient(45deg,#f1f5f9,#f1f5f9 12px,#e8eef5 12px,#e8eef5 24px);border:2px dashed #94a3b8;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#64748b;font-size:.85rem;gap:6px;overflow:hidden;text-align:center;padding:8px}
.ph .ph-icon{font-size:1.8rem;opacity:.6}
.ph img{width:100%;height:100%;object-fit:cover;border-radius:12px}
.ph.has-img{border:none;background:none;padding:0}
.photo-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-top:10px}
.photo-grid .ph, .photo-grid figure{aspect-ratio:4/3}
.photo-grid figure{border-radius:14px;overflow:hidden;margin:0;position:relative}
.photo-grid figure img{width:100%;height:100%;object-fit:cover}
.photo-grid figcaption{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(11,31,58,.75));color:#fff;font-size:.82rem;padding:18px 14px 10px}
.avatar-ph{width:130px;height:130px;border-radius:50%;flex-shrink:0}
.fig-ph{aspect-ratio:4/3}
.fig-stack{display:flex;flex-direction:column;gap:14px}
.fig-stack figure{margin:0;border-radius:12px;overflow:hidden;position:relative;border:1px solid var(--border)}
.fig-stack figure img{width:100%;display:block;object-fit:cover}
.fig-stack figcaption{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(11,31,58,.78));color:#fff;font-size:.8rem;padding:16px 12px 8px}

/* Footer */
footer{background:var(--navy);color:#64748b;text-align:center;padding:26px;font-size:.83rem}
footer a{color:#94a3b8;text-decoration:none}
footer a:hover{color:var(--accent)}

/* Mobile */
@media (max-width:768px){
  nav ul{display:none;position:absolute;top:100%;left:0;right:0;background:var(--navy);flex-direction:column;gap:0;padding:10px 0;align-items:stretch}
  nav ul.open{display:flex}
  nav ul li{padding:12px 28px}
  .menu-btn{display:block}
  .hero-inner{flex-direction:column;gap:28px;text-align:center}
  .hero-logo{width:300px;max-width:78vw}
  .hero .btns{justify-content:center}
  .cv-grid{grid-template-columns:1fr}
  .theme{padding:28px 22px}
  .theme-body{grid-template-columns:1fr}
  .post .post-photo{width:100%;min-height:180px}
  .post .post-photo .ph{border-right:none;border-bottom:2px dashed #cbd5e1}
  section{padding:64px 20px}
}