/* =========================================================
   IMD Lab Website Style
   Full-screen hero / fade-in animation / magazine research cards
   timeline news / white + logo-color minimal design
   ========================================================= */

:root{
  --navy:#07152b;
  --navy-2:#12345c;
  --steel:#6f7f8a;
  --blue:#3f78a8;
  --blue-light:#dcecf7;
  /* 差し色：サイト全体の5〜10%だけに使うローズピンク */
  --pink:#ea7ca8;
  --pink-light:#fff0f6;
  --mauve:var(--pink);
  --mauve-light:var(--pink-light);
  --ink:#172033;
  --text:#3d4654;
  --muted:#7a8491;
  --line:#e8edf2;
  --bg:#ffffff;
  --soft:#f7fafc;
  --shadow:0 22px 60px rgba(7,21,43,.10);
  --radius:26px;
  --container:min(1180px, 90vw);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Noto Sans JP","Roboto",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.85;
  letter-spacing:.02em;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy-2);text-decoration:none;transition:.25s ease}
a:hover{color:var(--pink)}
.container{width:var(--container);margin-inline:auto}

/* ================= Header ================= */
header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(232,237,242,.75);
}
header .container{
  min-height:82px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.logo img{height:58px;width:auto;object-fit:contain}
nav ul{
  list-style:none;
  display:flex;
  align-items:center;
  gap:22px;
  margin:0;
  padding:0;
}
nav a{
  color:var(--ink);
  font-size:.92rem;
  font-weight:600;
  letter-spacing:.04em;
  position:relative;
}
nav a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-8px;
  height:2px;
  background:linear-gradient(90deg,var(--blue),var(--mauve));
  transform:scaleX(0);
  transform-origin:left;
  transition:.25s ease;
}
nav a:hover::after,
nav a.active::after{transform:scaleX(1)}
.lang-switch a{
  padding:.55rem .9rem;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
}
.lang-switch a::after{display:none}
.hamburger{display:none}

/* ================= Full Screen Hero ================= */
#hero,
.top-hero{
  min-height:100svh;
  position:relative;
  display:flex;
  align-items:center;
  overflow:hidden;
  isolation:isolate;
  background:
    radial-gradient(circle at 77% 47%, rgba(234,124,168,.20), transparent 23%),
    radial-gradient(circle at 25% 25%, rgba(63,120,168,.20), transparent 28%),
    linear-gradient(115deg, rgba(7,21,43,.86), rgba(18,52,92,.70) 48%, rgba(255,255,255,.18)),
    url("../images/hero.jpg") center/cover no-repeat;
}
#hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(7,21,43,.84) 0%,rgba(7,21,43,.54) 45%,rgba(255,255,255,.08) 100%);
  z-index:-1;
}
#hero::after{
  content:"";
  position:absolute;
  right:-12vw;
  bottom:-16vw;
  width:58vw;
  height:58vw;
  border:1px solid rgba(255,255,255,.20);
  border-radius:50%;
  z-index:-1;
}
#hero .overlay{display:none}
#hero .content{
  width:var(--container);
  margin-inline:auto;
  color:#fff;
  padding-top:82px;
}
.hero-label,
.section-label{
  color:var(--blue);
  font-family:"Roboto",sans-serif;
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.26em;
  text-transform:uppercase;
  margin:0 0 1rem;
}
#hero .hero-label{color:var(--blue-light)}
#hero h1{
  max-width:1000px;
  margin:0 0 1.5rem;
  color:#fff;
  font-size:clamp(2rem,7vw,6.6rem);
  line-height:1.04;
  letter-spacing:.02em;
  font-weight:700;
  text-shadow:0 18px 50px rgba(0,0,0,.22);
}
#hero h4{
  max-width:1500px;
  margin:0 0 1.5rem;
  color:#fff;
  font-size:clamp(2.8rem,3vw,5rem);
  line-height:2;
  letter-spacing:.02em;
  font-weight:700;
  text-shadow:0 18px 50px rgba(0,0,0,.22);
}
#hero h5{
  max-width:1500px;
  margin:0 0 1.5rem;
  color:#cfede2;
  font-size:clamp(2.4rem,3vw,3rem);
  line-height:2;
  letter-spacing:.02em;
  font-weight:700;
  text-shadow:0 18px 50px rgba(0,0,0,.22);
}
.hero-sub{
  color:rgba(255,255,255,.94);
  font-family:"Roboto",sans-serif;
  font-size:clamp(1.05rem,2vw,1.55rem);
  letter-spacing:.08em;
  margin:0 0 1rem;
}

#hero .content > p{
  color:rgba(255,255,255,.92);
  font-family:"Roboto",sans-serif;
  font-size:clamp(1.05rem,2vw,1.45rem);
  letter-spacing:.08em;
  margin:1.2rem 0 0;
  position:relative;
  display:inline-block;
}
#hero .content > p::after{
  content:"";
  display:block;
  width:72px;
  height:3px;
  margin-top:18px;
  border-radius:999px;
  background:var(--pink);
}

.hero-text{
  max-width:690px;
  color:rgba(255,255,255,.88);
  font-size:1.08rem;
  margin:0;
}
.hero-buttons{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin-top:42px;
}
.btn-main,
.btn-sub{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:210px;
  padding:15px 28px;
  border-radius:999px;
  font-weight:700;
  letter-spacing:.04em;
}
.btn-main{
  color:#fff;
  background:linear-gradient(135deg,var(--navy-2),var(--pink));
  box-shadow:0 16px 36px rgba(234,124,168,.24);
}
.btn-main:hover{color:#fff;transform:translateY(-2px);box-shadow:0 20px 42px rgba(234,124,168,.32)}
.btn-sub{color:#fff;border:1px solid rgba(255,255,255,.72);background:rgba(255,255,255,.08)}
.btn-sub:hover{background:#fff;color:var(--navy)}

/* ================= Sections ================= */
.section{padding:112px 0}
.section:nth-of-type(even){background:var(--soft)}
.section h2{
  margin:0 0 26px;
  color:var(--ink);
  font-size:clamp(2rem,4vw,3.3rem);
  line-height:1.25;
  letter-spacing:.02em;
}
.section p{font-size:1.02rem}
.intro-section .container,
.contact-lead .container{max-width:900px}
.intro-section p{font-size:1.08rem}


/* ピンクは小さなアクセントに限定 */
.section h2::after{
  content:"";
  display:block;
  width:64px;
  height:4px;
  margin-top:18px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--blue),var(--pink));
}
#news .container > p a,
#research .container > p a,
#achievements .container > p a,
#members a{
  color:var(--navy-2);
  font-weight:700;
}
#news .container > p a:hover,
#research .container > p a:hover,
#achievements .container > p a:hover,
#members a:hover{
  color:var(--pink);
}

/* ================= News Timeline ================= */
#news .list{
  position:relative;
  list-style:none;
  margin:56px 0 0;
  padding:0 0 0 32px;
}
#news .list::before{
  content:"";
  position:absolute;
  top:4px;bottom:4px;left:7px;
  width:2px;
  background:linear-gradient(var(--blue),var(--mauve));
}
#news .list li{
  position:relative;
  margin:0 0 24px;
  padding:0 0 28px 28px;
  border-bottom:1px solid var(--line);
}
#news .list li::before{
  content:"";
  position:absolute;
  left:-35px;
  top:1.5rem;
  width:14px;
  height:14px;
  border-radius:50%;
}
#news .list li p{margin:.25rem 0}
.news-tag{
  display:inline-flex;
  align-items:center;
  padding:.28rem .75rem;
  border-radius:999px;
  font-size:.78rem;
  font-weight:700;
  line-height:1.2;
}
.news-tag--notice,
.news-tag--announcement{color:var(--navy-2);background:var(--blue-light)}
.news-tag--notice-important{color:#ffffff;background:#d3305c}
.news-tag--lab-life{color:#6f4d70;background:var(--mauve-light)}

/* ================= Magazine Research Cards ================= */
.grid.features{
  display:grid;
  gap:34px;
  margin-top:54px;
}
#research .grid.features{
  grid-template-columns:1fr;
}
#research .card{
  min-height:330px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:none;
  transition:.35s ease;
}
#research .card:hover{
  transform:translateY(-6px);
  box-shadow:0 22px 60px rgba(234,124,168,.16);
  border-color:rgba(234,124,168,.35);
}
#research .card a{
  display:grid;
  grid-template-columns:minmax(330px,46%) 1fr;
  min-height:330px;
  color:inherit;
}
#research .card img{
  width:100%;
  height:100%;
  min-height:330px;
  object-fit:cover;
}
#research .card h3,
#research .card p{
  grid-column:2;
  margin-left:54px;
  margin-right:54px;
}
#research .card h3{
  align-self:end;
  margin-top:72px;
  margin-bottom:18px;
  color:var(--ink);
  font-size:clamp(1.5rem,3vw,2.25rem);
  line-height:1.35;
}
#research .card p{
  max-width:560px;
  margin-top:0;
  margin-bottom:72px;
  color:var(--muted);
}

.grid.features p {
  text-align: center;
}

.grid.features h3 {
  text-align: center;
}
/* ================= Approach Cards ================= */
.concept-section{background:#fff}
.concept-section .grid.features{
  grid-template-columns:repeat(3,1fr);
}
.simple-card,
.concept-section .card{
  padding:44px 36px;
  background:linear-gradient(180deg,#fff,var(--soft));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:none;
}
.simple-card h3{
  margin:0 0 16px;
  color:var(--navy-2);
  font-family:"Roboto",sans-serif;
  font-size:1.25rem;
  letter-spacing:.05em;
}
.simple-card p{margin:0;color:var(--muted)}

/* ================= Publications / Members ================= */
#achievements .list{
  list-style:none;
  margin:44px 0 0;
  padding:0;
  border-top:1px solid var(--line);
}
#achievements .list li{
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
#members{background:linear-gradient(180deg,#fff,var(--soft))}
.contact-lead{
  text-align:center;
  background:linear-gradient(135deg,var(--soft),#fff 52%,var(--pink-light));
}
.contact-lead h2{font-size:clamp(2rem,4vw,3rem)}

/* ================= Footer ================= */
.footer-links{
  padding:76px 0;
  background:#fff;
  border-top:1px solid var(--line);
}
.footer-links_title{
  margin:0 0 28px;
  color:var(--ink);
  text-align:center;
  font-size:1.4rem;
}
.footer-links_grid{
  display:flex;
  justify-content:center;
  align-items:center;
  gap:28px;
  flex-wrap:wrap;
}
.footer-links_item{
  display:flex;
  align-items:center;
  justify-content:center;
  width:260px;
  min-height:96px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:18px;
  background:#fff;
}
.footer-links_item img{max-height:58px;object-fit:contain}
.footer-bottom{
  color:rgba(255,255,255,.78);
  background:var(--navy);
  padding:42px 0 26px;
}
.footer-nav ul{
  list-style:none;
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:18px 28px;
  margin:0 0 28px;
  padding:0;
}
.footer-nav a{color:rgba(255,255,255,.82)}
.footer-bottom_col{text-align:center}
.footer-bottom_col p{margin:.2rem 0}
.copy{text-align:center;margin:26px 0 0;font-size:.82rem;color:rgba(255,255,255,.52)}


.lang-switch a:hover{
  color:#fff;
  border-color:var(--pink);
  background:var(--pink);
}
.footer-nav a:hover{color:var(--pink)}
.footer-links_item:hover{
  border-color:rgba(234,124,168,.38);
  box-shadow:0 16px 40px rgba(234,124,168,.13);
  transform:translateY(-2px);
}

/* ================= Fade-in Animation ================= */
.fade-in{
  opacity:0;
  transform:translateY(34px);
  transition:opacity .85s ease, transform .85s ease;
}
.fade-in.is-visible{
  opacity:1;
  transform:none;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .fade-in{opacity:1;transform:none}
}

/* ================= Responsive ================= */
@media(max-width:980px){
  header .container{min-height:72px}
  .hamburger{
    display:flex;
    width:44px;height:44px;
    align-items:center;justify-content:center;
    border:1px solid var(--line);
    border-radius:50%;
    cursor:pointer;
  }
  .hamburger span,
  .hamburger span::before,
  .hamburger span::after{
    content:"";
    display:block;
    width:20px;height:2px;
    background:var(--navy);
    position:relative;
  }
  .hamburger span::before{position:absolute;top:-7px}
  .hamburger span::after{position:absolute;top:7px}
  nav ul{
    position:fixed;
    top:72px;right:0;
    width:min(360px,88vw);
    height:calc(100svh - 72px);
    padding:34px;
    flex-direction:column;
    align-items:flex-start;
    gap:18px;
    background:rgba(255,255,255,.96);
    border-left:1px solid var(--line);
    transform:translateX(105%);
    transition:.3s ease;
    box-shadow:-18px 0 40px rgba(7,21,43,.08);
  }
  nav ul.open,
  nav ul.active{transform:translateX(0)}
  #research .card a{grid-template-columns:1fr}
  #research .card img{min-height:260px;height:260px}
  #research .card h3,
  #research .card p{grid-column:1;margin-left:28px;margin-right:28px}
  #research .card h3{margin-top:34px}
  #research .card p{margin-bottom:40px}
  .concept-section .grid.features{grid-template-columns:1fr}
}
@media(max-width:640px){
  .section{padding:78px 0}
  .logo img{height:48px}
  #hero .content{padding-top:72px}
  .hero-buttons{flex-direction:column;align-items:flex-start}
  .btn-main,.btn-sub{width:100%;max-width:330px}
  #news .list{padding-left:24px}
}


/* =========================================================
   Sub Pages: members / research topic / achievements
   Pink accent kept around 5–10%
   ========================================================= */
main .section:first-child{
  padding-top:150px;
}
#members-page,
#research_topic,
#achievements-page{
  background:linear-gradient(180deg,#fff 0%, var(--soft) 100%);
}
.member-profile{
  display:grid;
  grid-template-columns:260px 1fr;
  gap:38px;
  align-items:center;
  margin:48px 0 34px;
  padding:34px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 18px 48px rgba(7,21,43,.07);
}
.profile-photo img{
  width:220px;
  aspect-ratio:1/1;
  object-fit:cover;
  border-radius:24px;
  border:6px solid #fff;
  box-shadow:0 18px 40px rgba(7,21,43,.12);
}
.profile-info h3,
#members-page h3,
#achievements-page h3,
.topic-detail h3{
  color:var(--ink);
}
.profile-info h3{
  margin-top:0;
  font-size:1.45rem;
}
.profile-info a,
.topic-detail a,
.publication-list a{
  color:var(--navy-2)!important;
  font-weight:700;
}
.profile-info a:hover,
.topic-detail a:hover,
.publication-list a:hover{
  color:var(--pink)!important;
}
.profile-info img[alt*="ORCID"],
.profile-info img[alt*="Research"]{
  display:inline-block;
  vertical-align:-2px;
  margin-right:.35rem;
}
.member-info,
.student-list,
.graduation-list{
  margin:22px 0 54px;
  padding:28px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
}
.member-info table{
  width:100%;
  border-collapse:collapse;
}
.member-info th,
.member-info td{
  padding:14px 16px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.member-info th{
  width:210px;
  color:var(--navy-2);
  text-align:left;
  background:linear-gradient(90deg,var(--pink-light),transparent);
}
.member-info th[colspan]{
  width:auto;
  color:var(--ink);
  background:var(--soft);
  border-left:4px solid var(--pink);
}
.student-list,
.graduation-list{
  list-style:none;
}
.student-list li,
.graduation-list li p{
  margin:.35rem 0;
}

#research_topic .grid.features{
  grid-template-columns:repeat(3,1fr);
  gap:26px;
}
#research_topic .card{
  display:block;
  color:inherit;
  overflow:hidden;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 14px 38px rgba(7,21,43,.06);
  transition:.35s ease;
}
#research_topic .card:hover{
  transform:translateY(-6px);
  border-color:rgba(234,124,168,.35);
  box-shadow:0 22px 60px rgba(234,124,168,.14);
}
#research_topic .card img{
  width:100%;
  height:230px;
  object-fit:cover;
}
#research_topic .card h3{
  margin:24px 24px 12px;
  color:var(--ink);
  line-height:1.45;
}
#research_topic .card p{
  margin:0 24px 28px;
  color:var(--muted);
}
.topic-detail{
  margin:56px 0;
  padding:38px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 14px 38px rgba(7,21,43,.055);
}
.topic-detail p{
  text-align: justify;
}
.topic-detail h3{
  margin-top:0;
  padding-left:18px;
  border-left:5px solid var(--pink);
  font-size:1.55rem;
}
.topic-detail .gallery{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
  margin:26px 0;
}
.topic-detail .gallery .gallery-item img{
  width:100%;
  height:190px;
  object-fit:cover;
  border-radius:18px;
  border:1px solid var(--line);
  transition:.25s ease;
}
.topic-detail .gallery .gallery-item img:hover{
  transform:scale(1.025);
  border-color:rgba(234,124,168,.55);
}
.topic-detail dl,
.topic-detail dd{
  margin:0;
}

.achievements-hero{
  margin-bottom:36px;
  padding:56px 42px;
  border-radius:var(--radius);
  background:
    radial-gradient(circle at right top, rgba(234,124,168,.18), transparent 32%),
    linear-gradient(135deg,var(--navy),var(--navy-2));
  color:#fff;
}
.achievements-main-title{
  color:#fff!important;
  margin:0!important;
}
.achievements-main-title::after{
  background:var(--pink)!important;
}
.tabs-container{
  margin-top:28px;
}
.tabs-container > input[type="radio"]{
  position:absolute;
  opacity:0;
  pointer-events:none;
}
.tabs-bar{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:20px;
}
.tabs-bar label{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:.75rem 1.15rem;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--navy-2);
  background:#fff;
  font-weight:700;
  cursor:pointer;
  transition:.25s ease;
}
.tabs-bar label:hover{
  border-color:rgba(234,124,168,.42);
  color:var(--pink);
}
.tab-card{
  padding:34px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 18px 48px rgba(7,21,43,.07);
}
.tab-content{display:none;}
#tab1:checked ~ .tabs-bar label[for="tab1"],
#tab2:checked ~ .tabs-bar label[for="tab2"],
#tab3:checked ~ .tabs-bar label[for="tab3"],
#tab4:checked ~ .tabs-bar label[for="tab4"],
#tab5:checked ~ .tabs-bar label[for="tab5"]{
  color:#fff;
  border-color:var(--pink);
  background:linear-gradient(135deg,var(--navy-2),var(--pink));
  box-shadow:0 12px 28px rgba(234,124,168,.20);
}
#tab1:checked ~ .tab-card #content1,
#tab2:checked ~ .tab-card #content2,
#tab3:checked ~ .tab-card #content3,
#tab4:checked ~ .tab-card #content4,
#tab5:checked ~ .tab-card #content5{display:block;}
.publication-list{
  padding-left:1.35rem;
}
.publication-list li{
  margin:0 0 1.25rem;
  padding-bottom:1.25rem;
  border-bottom:1px solid var(--line);
}
.note-list{
  margin-top:.65rem;
  color:var(--muted);
}
#achievements-page h4{
  margin:34px 0 16px;
  color:var(--navy-2);
  font-size:1.35rem;
}

@media(max-width:980px){
  main .section:first-child{padding-top:120px;}
  .member-profile{grid-template-columns:1fr;}
  #research_topic .grid.features{grid-template-columns:1fr 1fr;}
}
@media(max-width:640px){
  .member-profile,
  .member-info,
  .student-list,
  .graduation-list,
  .topic-detail,
  .tab-card{padding:22px;}
  #research_topic .grid.features,
  .topic-detail .gallery{grid-template-columns:1fr;}
  .profile-photo img{width:180px;}
  .member-info th,
  .member-info td{display:block;width:100%;}
  .tabs-bar{display:grid;grid-template-columns:1fr;}
}


/* ================= Contact Page ================= */
#contact-page{
  padding-top:150px;
  background:
    radial-gradient(circle at 88% 12%, rgba(234,124,168,.12), transparent 24%),
    linear-gradient(180deg,#fff,var(--soft));
}
.contact-intro{
  max-width:1000px;
  margin:0 0 44px;
  color:var(--muted);
}
.contact-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:28px;
  margin-top:46px;
}
.contact-card{
  position:relative;
  padding:38px 34px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:0 18px 50px rgba(7,21,43,.07);
  overflow:hidden;
}
.contact-card::before{
  content:"";
  position:absolute;
  inset:0 auto 0 0;
  width:6px;
  background:linear-gradient(180deg,var(--blue),var(--pink));
}
.contact-card h3{
  margin:0 0 14px;
  color:var(--ink);
  font-size:1.35rem;
  line-height:1.45;
}
.contact-card p{
  margin:0 0 24px;
  color:var(--text);
}
.contact-button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.4em;
  padding:12px 22px;
  border-radius:999px;
  color:#fff;
  font-weight:700;
  background:linear-gradient(135deg,var(--navy-2),var(--pink));
  box-shadow:0 14px 30px rgba(234,124,168,.22);
}
.contact-button:hover{
  color:#fff;
  transform:translateY(-2px);
  box-shadow:0 18px 38px rgba(234,124,168,.30);
}
.contact-note{
  margin-top:42px;
  padding:24px 28px;
  border:1px solid rgba(234,124,168,.22);
  border-radius:20px;
  background:var(--pink-light);
  color:var(--muted);
}
@media(max-width:760px){
  #contact-page{padding-top:118px}
  .contact-grid{grid-template-columns:1fr}
  .contact-card{padding:32px 26px}
}


/* =========================================================
   News Page:年度別ラジオタブ修正
   HTML側の id="tab-2026" / id="content-2026" に対応
   ========================================================= */
#news-page{
  padding-top:150px;
  background:linear-gradient(180deg,#fff 0%, var(--soft) 100%);
}

#news-page .page-lead{
  max-width:820px;
  color:var(--muted);
  margin-bottom:42px;
}

#news-page .tabs-container{
  margin-top:28px;
}

#news-page .tabs-container > input[type="radio"]{
  position:absolute;
  opacity:0;
  pointer-events:none;
}

#news-page .tab-content{
  display:none;
}

/* ここが重要：HTMLのID名に合わせる */
#tab-2026:checked ~ .tab-card #content-2026,
#tab-2025:checked ~ .tab-card #content-2025,
#tab-2024:checked ~ .tab-card #content-2024,
#tab-2023:checked ~ .tab-card #content-2023,
#tab-2022:checked ~ .tab-card #content-2022,
#tab-2021:checked ~ .tab-card #content-2021{
  display:block;
}

/* 選択中の年度ボタン */
#tab-2026:checked ~ .tabs-bar label[for="tab-2026"],
#tab-2025:checked ~ .tabs-bar label[for="tab-2025"],
#tab-2024:checked ~ .tabs-bar label[for="tab-2024"],
#tab-2023:checked ~ .tabs-bar label[for="tab-2023"],
#tab-2022:checked ~ .tabs-bar label[for="tab-2022"],
#tab-2021:checked ~ .tabs-bar label[for="tab-2021"]{
  color:#fff;
  border-color:var(--pink);
  background:linear-gradient(135deg,var(--navy-2),var(--pink));
  box-shadow:0 12px 28px rgba(234,124,168,.20);
}

/* News一覧の見た目 */
.news-year-title{
  margin:0 0 24px;
  color:var(--ink);
  font-size:1.55rem;
  line-height:1.4;
}

.news-year-title::after{
  content:"";
  display:block;
  width:52px;
  height:3px;
  margin-top:12px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--blue),var(--pink));
}

.news-list{
  list-style:none;
  margin:0;
  padding:0;
}

.news-list li{
  position:relative;
  padding:24px 0 24px 28px;
  border-bottom:1px solid var(--line);
}

.news-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:34px;
  width:11px;
  height:11px;
  border-radius:50%;
}

.news-list li:first-child{
  padding-top:0;
}

.news-list li:first-child::before{
  top:10px;
}

.news-list li p{
  margin:.25rem 0;
}

.news-tag--achievements,
.news-tag--publication{
  color:#6f4d70;
  background:var(--pink-light);
}

.news-tag--award{
  color:#fff;
  background:linear-gradient(135deg,var(--navy-2),var(--pink));
}

@media(max-width:760px){
  #news-page{padding-top:118px;}
}

/* =========================================================
   Index Page Research Cards: PCでは画像と文字を横並びにする
   ========================================================= */
@media (min-width:981px){
  #research .grid.features{
    display:grid;
    grid-template-columns:1fr;
    gap:34px;
  }

  #research .card{
    min-height:0;
  }

  #research .card a{
    display:grid;
    grid-template-columns:minmax(420px,46%) 1fr;
    grid-template-rows:auto auto;
    align-content:center;
    min-height:300px;
  }

  #research .card img{
    grid-column:1;
    grid-row:1 / span 2;
    width:100%;
    height:100%;
    min-height:300px;
    object-fit:cover;
  }

  #research .card h3{
    grid-column:2;
    grid-row:1;
    align-self:end;
    margin:0 54px 14px;
    color:var(--ink);
    font-size:clamp(1.55rem,2.6vw,2.35rem);
    line-height:1.35;
    text-align:center;
  }

  #research .card p{
    grid-column:2;
    grid-row:2;
    align-self:start;
    max-width:620px;
    margin:0 auto 0;
    padding:0 54px 0;
    color:var(--muted);
    text-align:center;
  }
}

@media (max-width:980px){
  #research .card a{
    display:grid;
    grid-template-columns:1fr;
  }

  #research .card img{
    grid-column:1;
    grid-row:auto;
    height:260px;
    min-height:260px;
  }

  #research .card h3,
  #research .card p{
    grid-column:1;
    grid-row:auto;
  }
}


/* =========================================================
   Research Topic Lightbox
   ========================================================= */
.lightbox-overlay{
  position:fixed;
  inset:0;
  z-index:3000;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:80px 7vw;
  background:rgba(7,21,43,.86);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .25s ease, visibility .25s ease;
}
.lightbox-overlay.active{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}
.lightbox-overlay img{
  display:block;
  max-width:min(1100px,88vw);
  max-height:82vh;
  width:auto;
  height:auto;
  object-fit:contain;
  border-radius:22px;
  background:#fff;
  box-shadow:0 28px 90px rgba(0,0,0,.36);
}
.lightbox-close,
.lightbox-nav{
  position:absolute;
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  border-radius:999px;
  color:#fff;
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.28);
  cursor:pointer;
  user-select:none;
  backdrop-filter:blur(10px);
  transition:.25s ease;
}
.lightbox-close:hover,
.lightbox-nav:hover{
  background:var(--pink);
  border-color:var(--pink);
  transform:translateY(-2px);
}
.lightbox-close{
  top:28px;
  right:34px;
  font-size:2rem;
  line-height:1;
}
.lightbox-nav{
  top:50%;
  transform:translateY(-50%);
  font-size:1.7rem;
  font-weight:700;
}
.lightbox-nav:hover{
  transform:translateY(-50%) scale(1.05);
}
.lightbox-nav.prev{left:34px;}
.lightbox-nav.next{right:34px;}
body.lightbox-open{overflow:hidden;}
.topic-detail .gallery .gallery-item{position:relative;}
.topic-detail .gallery .gallery-item::after{
  content:"クリックで拡大";
  position:absolute;
  right:12px;
  bottom:12px;
  padding:.25rem .65rem;
  border-radius:999px;
  color:#fff;
  background:rgba(7,21,43,.58);
  font-size:.72rem;
  opacity:0;
  transform:translateY(6px);
  transition:.25s ease;
}
.topic-detail .gallery .gallery-item:hover::after{
  opacity:1;
  transform:none;
}
@media(max-width:760px){
  .lightbox-overlay{padding:70px 18px;}
  .lightbox-close{top:18px;right:18px;}
  .lightbox-nav{width:42px;height:42px;font-size:1.35rem;}
  .lightbox-nav.prev{left:14px;}
  .lightbox-nav.next{right:14px;}
  .lightbox-overlay img{max-width:92vw;max-height:76vh;border-radius:16px;}
}