@charset "UTF-8";
/* =========================================================
   奄美シンポジウム2026 — 東京大学医科学研究所
   Design tokens
   色 ── 藍海 #17384A / 珊瑚朱 #C8492E / 深緑 #2F6B52
          砂浜 #F3EFE3 / 墨 #1E2622 / 金陽 #D9A441
   書体 ── 見出し: Shippori Mincho / 本文: Zen Kaku Gothic New
           英字・数字アクセント: Fraunces
   ========================================================= */

:root{
  --ai-umi:#17384A;
  --ai-umi-deep:#0E2530;
  --sango:#C8492E;
  --sango-deep:#A63A22;
  --mangrove:#2F6B52;
  --sand:#F3EFE3;
  --sand-deep:#E9E2CE;
  --sumi:#1E2622;
  --sumi-soft:#4A544E;
  --gold:#D9A441;
  --white:#FFFFFF;

  --font-mincho:"Shippori Mincho", serif;
  --font-sans:"Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-accent:"Fraunces", serif;

  --max-w:1120px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth; font-size:106%;} /* 全体の文字サイズを少しだけ大きく（rem基準を底上げ） */
body{
  margin:0;
  background:var(--sand);
  color:var(--sumi);
  font-family:var(--font-sans);
  font-size:1rem;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{
  font-family:var(--font-mincho);
  font-weight:600;
  margin:0;
  color:var(--ai-umi);
  letter-spacing:.02em;
}
p{margin:0 0 1em;}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 28px;}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important; transition-duration:.001ms !important;}
}

/* ---------- eyebrow / accent label ---------- */
.eyebrow{
  font-family:var(--font-accent);
  font-style:italic;
  font-weight:500;
  font-size:.82rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--sango);
  display:inline-flex;
  align-items:center;
  gap:.6em;
  margin-bottom:.9em;
}
.eyebrow::before{
  content:"";
  width:28px;height:1px;
  background:var(--sango);
  display:inline-block;
}

/* ---------- header / nav ---------- */
/* header is split into two rows so that adding more tabs never overlaps the
   logo: a brand bar on top, and a full-width nav bar below it that wraps
   onto multiple lines if needed. On narrow screens the nav bar becomes a
   full-screen toggle menu instead. */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(23,56,74,.94);
  border-bottom:1px solid rgba(217,164,65,.25);
}
.header-bar{
  display:flex; align-items:center; justify-content:space-between;
  padding-top:12px; padding-bottom:12px;
  gap:20px;
  backdrop-filter:blur(6px);
}
.brand{display:flex; align-items:center; gap:14px; min-width:0;}
.brand img{height:44px; width:auto; flex:none;}
.brand-text{color:var(--sand); line-height:1.35; min-width:0;}
.brand-text .en{
  display:block; font-family:var(--font-accent); font-style:italic;
  font-size:.72rem; letter-spacing:.12em; color:var(--gold);
  white-space:nowrap;
}
.brand-text .ja{
  display:block; font-family:var(--font-mincho); font-size:1rem; color:var(--white);
  white-space:nowrap;
}

nav.gnav{ border-top:1px solid rgba(217,164,65,.18); }
nav.gnav ul{
  list-style:none; display:flex; flex-wrap:wrap; justify-content:center;
  margin:0 auto; padding:6px 28px; gap:2px 4px; max-width:var(--max-w);
}
nav.gnav a{
  display:block;
  color:var(--sand); font-size:.85rem; padding:9px 12px; border-radius:2px;
  border-bottom:2px solid transparent;
  transition:border-color .2s ease, color .2s ease;
  white-space:nowrap;
}
nav.gnav a:hover, nav.gnav a.is-active{ border-color:var(--sango); color:var(--white);}
.nav-toggle{display:none;}

@media (max-width:760px){
  nav.gnav{
    border-top:none;
    position:fixed; inset:var(--header-h, 60px) 0 0 0; background:var(--ai-umi-deep);
    transform:translateY(-8px); opacity:0; pointer-events:none;
    transition:opacity .25s ease, transform .25s ease;
    overflow-y:auto;
  }
  nav.gnav.is-open{opacity:1; pointer-events:auto; transform:translateY(0);}
  nav.gnav ul{flex-direction:column; flex-wrap:nowrap; justify-content:flex-start; padding:20px 28px; max-width:none;}
  nav.gnav a{padding:16px 4px; border-bottom:1px solid rgba(255,255,255,.08); border-radius:0; font-size:.98rem;}
  .nav-toggle{
    display:block; background:none; border:1px solid rgba(255,255,255,.4);
    color:var(--sand); width:42px; height:38px; border-radius:2px; font-size:1.1rem; flex:none;
  }
}

@media (max-width:420px){
  .brand-text .en{display:none;}
}

/* ---------- hero ---------- */
.hero{
  position:relative; color:var(--white);
  min-height:78vh;
  display:flex; align-items:flex-end;
  overflow:hidden;
  isolation:isolate;
}
.hero img.hero-bg{
  position:absolute; inset:0; width:100%; height:100%; object-fit:cover;
  z-index:-2;
}
.hero::after{
  content:"";
  position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(14,37,48,.55) 0%, rgba(14,37,48,.35) 40%, rgba(14,37,48,.92) 100%);
  z-index:-1;
}
.hero-inner{padding:120px 0 64px;}
.hero .eyebrow{color:var(--gold);}
.hero .eyebrow::before{background:var(--gold);}
.hero h1{
  color:var(--white);
  font-size:clamp(2.1rem, 4.6vw, 3.4rem);
  line-height:1.5;
  margin-bottom:.5em;
}
.hero h1 small{
  display:block; font-family:var(--font-accent); font-style:italic; font-weight:400;
  font-size:.42em; color:var(--sand-deep); letter-spacing:.04em; margin-top:.5em;
}
.hero-meta{
  display:flex; flex-wrap:wrap; gap:14px 34px; margin-top:1.6em;
  font-size:.95rem; color:var(--sand-deep);
}
.hero-meta div strong{
  display:block; font-family:var(--font-accent); font-style:italic; color:var(--gold);
  font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; margin-bottom:.3em; font-weight:500;
}
.hero-cta{display:flex; gap:14px; margin-top:2.2em; flex-wrap:wrap;}

.btn{
  display:inline-flex; align-items:center; gap:.5em;
  padding:14px 30px; font-size:.92rem; letter-spacing:.04em;
  border:1px solid currentColor; border-radius:2px;
  transition:background .2s ease, color .2s ease, transform .2s ease;
}
.btn-primary{background:var(--sango); border-color:var(--sango); color:var(--white);}
.btn-primary:hover{background:var(--sango-deep); border-color:var(--sango-deep); transform:translateY(-1px);}
.btn-ghost{color:var(--white);}
.btn-ghost:hover{background:rgba(255,255,255,.12); transform:translateY(-1px);}
.btn-dark{color:var(--ai-umi); border-color:var(--ai-umi);}
.btn-dark:hover{background:var(--ai-umi); color:var(--white);}

/* ---------- tide divider ---------- */
.tide{display:block; width:100%; line-height:0;}
.tide svg{width:100%; height:auto; display:block;}

/* ---------- section shell ---------- */
section{padding:96px 0;}
section.tight{padding:64px 0;}
.section-head{max-width:680px; margin-bottom:56px;}
.section-head h2{font-size:clamp(1.6rem,3vw,2.1rem); line-height:1.6;}
.section-head p{color:var(--sumi-soft); margin-top:1em;}
.bg-umi{background:var(--ai-umi); color:var(--sand);}
.bg-umi h2,.bg-umi h3,.bg-umi h4{color:var(--white);}
.bg-sand-deep{background:var(--sand-deep);}

/* ---------- theme / one health emblem ---------- */
.theme-section{position:relative;}
.theme-grid{
  display:grid; grid-template-columns:1.1fr .9fr; gap:60px; align-items:center;
}
.theme-copy h2{font-size:clamp(1.5rem,3vw,2rem); line-height:1.85;}
.theme-copy p{color:rgba(243,239,227,.86);}
.emblem{display:flex; justify-content:center;}
.emblem svg{width:100%; max-width:340px; height:auto;}

@media (max-width:860px){
  .theme-grid{grid-template-columns:1fr; gap:40px;}
  .emblem{order:-1;}
  .emblem svg{max-width:240px;}
}

/* ---------- overview info grid ---------- */
.info-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:1px;
  background:var(--sand-deep); border:1px solid var(--sand-deep);
}
.info-cell{background:var(--sand); padding:30px 32px;}
.info-cell .label{
  font-family:var(--font-accent); font-style:italic; font-size:.75rem;
  letter-spacing:.1em; text-transform:uppercase; color:var(--sango); margin-bottom:.6em; display:block;
}
.info-cell .val{font-size:1rem; color:var(--sumi); line-height:1.85;}
.info-cell .val small{display:block; color:var(--sumi-soft); font-size:.85rem; margin-top:.3em;}
@media (max-width:640px){ .info-grid{grid-template-columns:1fr;} }

/* ---------- pillar cards ---------- */
.pillars{display:grid; grid-template-columns:repeat(3,1fr); gap:2px; background:var(--sand-deep);}
.pillar{
  background:var(--white); padding:44px 34px; position:relative;
}
.pillar .num{
  font-family:var(--font-accent); font-style:italic; color:var(--sango);
  font-size:.82rem; letter-spacing:.1em; display:block; margin-bottom:1.2em;
}
.pillar h3{font-size:1.2rem; margin-bottom:.7em; line-height:1.6;}
.pillar p{color:var(--sumi-soft); font-size:.92rem; margin:0;}
.pillar .mark{width:44px; height:44px; margin-bottom:1.4em;}
@media (max-width:860px){ .pillars{grid-template-columns:1fr;} }

/* ---------- program teaser (day rail) ---------- */
.day-rail{display:grid; grid-template-columns:repeat(4,1fr); gap:2px; background:var(--sand-deep);}
.day-card{background:var(--white); padding:34px 28px;}
.day-card .d{
  font-family:var(--font-accent); font-style:italic; color:var(--sango);
  font-size:1.9rem; line-height:1; display:block; margin-bottom:.3em;
}
.day-card .date{font-size:.82rem; color:var(--sumi-soft); display:block; margin-bottom:1em;}
.day-card h4{font-size:1rem; line-height:1.7; margin-bottom:.5em;}
.day-card ul{margin:0; padding-left:1.1em; font-size:.85rem; color:var(--sumi-soft);}
.day-card li{margin-bottom:.3em;}
@media (max-width:860px){ .day-rail{grid-template-columns:1fr 1fr;} }
@media (max-width:540px){ .day-rail{grid-template-columns:1fr;} }

/* ---------- venues teaser ---------- */
.venue-grid{display:grid; grid-template-columns:1fr 1fr; gap:2px; background:var(--sand-deep);}
.venue-card{background:var(--white); overflow:hidden;}
.venue-card .ph{height:240px; overflow:hidden;}
.venue-card .ph img{width:100%; height:100%; object-fit:cover; transition:transform .5s ease;}
.venue-card:hover .ph img{transform:scale(1.05);}
.venue-card .body{padding:30px 32px;}
.venue-card .tag{font-family:var(--font-accent); font-style:italic; color:var(--mangrove); font-size:.78rem; letter-spacing:.1em; text-transform:uppercase;}
.venue-card h3{margin:.4em 0 .5em; font-size:1.15rem;}
.venue-card p{color:var(--sumi-soft); font-size:.92rem;}
@media (max-width:700px){ .venue-grid{grid-template-columns:1fr;} }

/* ---------- committee / contact ---------- */
.committee-list{display:flex; flex-wrap:wrap; gap:10px 14px; margin-top:1.2em;}
.committee-list span{
  font-size:.9rem; padding:8px 16px; border:1px solid var(--sand-deep); border-radius:2px; color:var(--sumi);
}
.contact-box{
  background:var(--white); border:1px solid var(--sand-deep); padding:34px 36px; margin-top:20px;
}
.contact-box dl{display:grid; grid-template-columns:120px 1fr; gap:10px 18px; margin:0; font-size:.94rem;}
.contact-box dt{color:var(--sumi-soft); font-family:var(--font-accent); font-style:italic;}
.contact-box dd{margin:0;}

/* ---------- footer ---------- */
.site-footer{background:var(--ai-umi-deep); color:rgba(243,239,227,.75); padding:56px 0 30px;}
.foot-grid{display:flex; justify-content:space-between; gap:40px; flex-wrap:wrap; padding-bottom:30px; border-bottom:1px solid rgba(255,255,255,.12);}
.foot-brand{display:flex; align-items:center; gap:14px;}
.foot-brand img{height:38px; filter:brightness(0) invert(1); opacity:.9;}
.foot-brand .ja{font-family:var(--font-mincho); color:var(--white); font-size:1rem;}
.foot-nav ul{list-style:none; display:flex; gap:22px; margin:0; padding:0; flex-wrap:wrap;}
.foot-nav a{font-size:.86rem; color:rgba(243,239,227,.75);}
.foot-nav a:hover{color:var(--gold);}
.foot-bottom{display:flex; justify-content:space-between; padding-top:22px; font-size:.78rem; flex-wrap:wrap; gap:10px;}
.foot-bottom a{color:var(--gold);}

/* ---------- page hero (sub pages) ---------- */
.page-hero{
  background:var(--ai-umi); color:var(--white); padding:150px 0 70px; position:relative; overflow:hidden;
}
.page-hero .eyebrow{color:var(--gold);}
.page-hero .eyebrow::before{background:var(--gold);}
.page-hero h1{color:var(--white); font-size:clamp(1.9rem,4vw,2.6rem);}
.page-hero p{color:rgba(243,239,227,.8); max-width:640px; margin-top:.8em;}

/* ---------- program page ---------- */
.day-nav{
  position:sticky; top:var(--header-h, 73px); z-index:60; background:var(--sand);
  border-bottom:1px solid var(--sand-deep); overflow-x:auto;
}
.day-nav ul{list-style:none; display:flex; margin:0; padding:0 28px; max-width:var(--max-w); margin:0 auto;}
.day-nav a{
  display:block; padding:16px 20px; font-size:.88rem; white-space:nowrap;
  border-bottom:2px solid transparent; color:var(--sumi-soft);
}
.day-nav a:hover, .day-nav a.is-active{color:var(--sango); border-color:var(--sango);}

.day-block{padding:64px 0; border-bottom:1px solid var(--sand-deep);}
.day-block:last-child{border-bottom:none;}
.day-title{display:flex; align-items:baseline; gap:20px; margin-bottom:.6em; flex-wrap:wrap;}
.day-title .d{font-family:var(--font-accent); font-style:italic; color:var(--sango); font-size:2.6rem; line-height:1;}
.day-title .date{font-size:1.05rem; color:var(--sumi-soft);}
.day-lede{color:var(--sumi-soft); margin-bottom:2.4em; max-width:680px;}

.venue-flag{
  display:inline-flex; align-items:center; gap:.5em; font-size:.8rem; letter-spacing:.08em;
  background:var(--mangrove); color:var(--white); padding:5px 14px; border-radius:2px; margin-bottom:1.6em;
}

.session{margin-bottom:2.6em;}
.session-head{
  border-left:3px solid var(--sango); padding-left:16px; margin-bottom:1.1em;
}
.session-head h3{font-size:1.08rem; line-height:1.7;}
.session-head .chair{font-size:.85rem; color:var(--sumi-soft); margin-top:.3em;}

.talk-table{width:100%; border-collapse:collapse; font-size:.92rem;}
.talk-table tr{border-bottom:1px solid var(--sand-deep);}
.talk-table tr:last-child{border-bottom:none;}
.talk-table td{padding:12px 10px; vertical-align:top;}
.talk-table td.time{
  width:118px; font-family:var(--font-accent); font-style:italic; color:var(--sango);
  white-space:nowrap; font-size:.9rem;
}
.talk-table td.title{color:var(--sumi);}
.talk-table td.speaker{color:var(--sumi-soft); font-size:.88rem;}
.talk-table tr.break td{color:var(--sumi-soft); font-style:italic; font-size:.85rem;}
.talk-table tr.tbd td.title{color:var(--sumi-soft);}

.note-box{
  background:var(--sand-deep); padding:20px 24px; font-size:.88rem; color:var(--sumi-soft);
  margin-top:1.6em; border-left:3px solid var(--gold);
}

/* ---------- access page ---------- */
.venue-detail{padding:70px 0; border-bottom:1px solid var(--sand-deep);}
.venue-detail:last-of-type{border-bottom:none;}
.venue-detail-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center;}
.venue-detail-grid.rev{direction:rtl;}
.venue-detail-grid.rev > *{direction:ltr;}
.venue-detail .ph{overflow:hidden;}
.venue-detail .ph img{width:100%; height:100%; object-fit:cover; aspect-ratio:4/3;}
.venue-detail h3{font-size:1.5rem; margin-bottom:.6em;}
.venue-detail .desc{color:var(--sumi-soft);}
.venue-detail dl{margin-top:1.6em; font-size:.92rem;}
.venue-detail dt{font-family:var(--font-accent); font-style:italic; color:var(--sango); font-size:.78rem; letter-spacing:.08em; text-transform:uppercase; margin-top:1em;}
.venue-detail dd{margin:.2em 0 0;}
@media (max-width:800px){ .venue-detail-grid, .venue-detail-grid.rev{grid-template-columns:1fr; direction:ltr;} }

.reg-cta{
  background:var(--sango); color:var(--white); padding:64px 0; text-align:center;
}
.reg-cta h2{color:var(--white); font-size:clamp(1.4rem,3vw,1.9rem); margin-bottom:.6em;}
.reg-cta p{color:rgba(255,255,255,.88); max-width:560px; margin:0 auto 1.8em;}

/* ---------- registration / guidance pages (reg-section, reg-table) ---------- */
.reg-section{padding:70px 0; border-bottom:1px solid var(--sand-deep);}
.reg-section:last-of-type{border-bottom:none;}
.reg-section .section-head{margin-bottom:36px;}
.reg-section .section-head h2{font-size:1.5rem;}

.reg-table{width:100%; border-collapse:collapse; margin-top:.4em; background:var(--white);}
.reg-table th, .reg-table td{padding:16px 22px; border:1px solid var(--sand-deep); font-size:.92rem; vertical-align:top; line-height:1.8;}
.reg-table th{
  background:var(--sand-deep); width:180px; text-align:left;
  font-family:var(--font-accent); font-style:italic; color:var(--sango); font-weight:500; letter-spacing:.02em;
}
.reg-table td a{color:var(--sango); text-decoration:underline; text-underline-offset:3px;}
.reg-table td del{color:var(--sumi-soft);}
@media (max-width:640px){
  .reg-table, .reg-table thead, .reg-table tbody, .reg-table th, .reg-table td, .reg-table tr{display:block; width:auto;}
  .reg-table th{border-bottom:none;}
  .reg-table td{border-top:none;}
}

.download-list{list-style:none; padding:0; margin:1em 0 0; display:flex; flex-direction:column; gap:.7em;}
.download-list a{
  display:inline-flex; align-items:center; gap:.6em; color:var(--ai-umi);
  border-bottom:1px solid var(--sango); padding-bottom:2px; width:fit-content; font-size:.94rem;
}
.download-list a::before{content:"↓"; color:var(--sango); font-family:var(--font-accent);}
.download-list a:hover{color:var(--sango);}

.guide-block{margin-bottom:2.6em;}
.guide-block:last-child{margin-bottom:0;}
.guide-block h3{
  font-size:1.15rem; border-left:3px solid var(--sango); padding-left:16px; margin-bottom:1em; line-height:1.7;
}
.guide-block h4{
  font-family:var(--font-sans); font-size:.98rem; color:var(--sumi); margin:1.4em 0 .6em;
  font-weight:700;
}
.guide-block ul{margin:0 0 1em; padding-left:1.3em; color:var(--sumi-soft); font-size:.92rem;}
.guide-block ul li{margin-bottom:.5em;}
.guide-block p{color:var(--sumi-soft); font-size:.92rem;}

.bell-list{list-style:none; margin:1em 0; padding:0; display:flex; flex-direction:column; gap:.5em;}
.bell-list li{
  font-size:.9rem; color:var(--sumi); background:var(--sand); border:1px solid var(--sand-deep);
  padding:10px 16px; border-radius:2px;
}
.bell-list b{color:var(--sango); font-family:var(--font-accent); font-style:italic; margin-right:.6em;}

.guide-nav{
  position:sticky; top:var(--header-h, 73px); z-index:60; background:var(--sand);
  border-bottom:1px solid var(--sand-deep); overflow-x:auto;
}
.guide-nav ul{list-style:none; display:flex; margin:0; padding:0 28px; max-width:var(--max-w); margin:0 auto;}
.guide-nav a{
  display:block; padding:16px 20px; font-size:.86rem; white-space:nowrap;
  border-bottom:2px solid transparent; color:var(--sumi-soft);
}
.guide-nav a:hover, .guide-nav a.is-active{color:var(--sango); border-color:var(--sango);}

.notice-badge{
  display:inline-block; font-size:.76rem; letter-spacing:.06em; padding:4px 12px;
  border-radius:2px; margin-bottom:1em; font-family:var(--font-accent); font-style:italic;
}
.notice-badge.tbd{background:var(--sand-deep); color:var(--sumi-soft);}

/* ---------- accommodation / tourism pages ---------- */
.sympo-map-embed{
  position:relative; width:100%; aspect-ratio:4/3; overflow:hidden;
  background:var(--sand-deep); border:1px solid var(--sand-deep);
}
.sympo-map-embed iframe{
  position:absolute; top:0; left:0; width:100%; height:100%; border:0;
}
.sympo-map-caption{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  margin-top:.9em; font-size:.85rem; color:var(--sumi-soft);
}
.sympo-map-caption a{color:var(--sango); text-decoration:underline; text-underline-offset:3px; white-space:nowrap;}

.sympo-hotel-list{list-style:none; margin:1em 0 0; padding:0; display:flex; flex-direction:column; gap:.6em;}
.sympo-hotel-list li{
  font-size:.95rem; color:var(--sumi); background:var(--white); border:1px solid var(--sand-deep);
  padding:14px 18px; border-radius:2px; display:flex; flex-wrap:wrap; align-items:baseline; gap:.4em 1em;
}
.sympo-hotel-list li a{color:var(--sango); text-decoration:underline; text-underline-offset:3px; font-weight:500;}
.sympo-hotel-list li span{color:var(--sumi-soft); font-size:.85rem;}

.sympo-link-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px; margin-top:1.6em;}
.sympo-link-card{
  background:var(--white); border:1px solid var(--sand-deep); padding:32px 30px;
  display:flex; flex-direction:column; gap:.8em; min-height:160px;
  transition:border-color .2s ease, transform .2s ease;
}
.sympo-link-card:hover{border-color:var(--sango); transform:translateY(-2px);}
.sympo-link-card .tag{font-family:var(--font-accent); font-style:italic; color:var(--mangrove); font-size:.78rem; letter-spacing:.1em; text-transform:uppercase;}
.sympo-link-card h3{font-size:1.1rem; line-height:1.6; margin:0;}
.sympo-link-card p{color:var(--sumi-soft); font-size:.92rem; margin:0;}
.sympo-link-card .go{font-size:.86rem; color:var(--sango); margin-top:.2em;}
@media (max-width:700px){ .sympo-link-grid{grid-template-columns:1fr;} }

/* ---------- misc ---------- */
.pagetop{position:fixed; right:24px; bottom:24px; z-index:90; width:46px; height:46px;
  background:var(--ai-umi); color:var(--white); border-radius:50%;
  display:flex; align-items:center; justify-content:center; font-size:1.1rem;
  opacity:0; pointer-events:none; transition:opacity .25s ease, transform .25s ease;
}
.pagetop.show{opacity:1; pointer-events:auto;}
.pagetop:hover{transform:translateY(-3px);}