@charset "UTF-8";
:root{
  --navy:#15265e;
  --gold:#b87916;
  --orange:#e85a0b;
  --text:#333;
  --line:#e8e8e8;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-y:scroll}
body{margin:0;color:var(--text);font-family:"Yu Gothic","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;background:#fff}
a{color:inherit}
.header{background:#15265e;border-bottom:4px solid #b87916;position:sticky;top:0;z-index:20}
.header-inner{
  width:min(1400px, calc(100% - 40px));
  margin:auto;
  min-height:86px;
  padding:0;
  display:grid;
  grid-template-columns:220px 1fr 220px;
  align-items:center;
}
.site-logo{justify-self:start}
nav{justify-self:center}
.logo{text-decoration:none;font-family:Georgia,"Times New Roman",serif;font-size:34px;letter-spacing:.08em;color:#fff}
.logo span{font-size:21px;color:#d6a44b;margin-left:5px}
nav{display:flex;align-items:center;justify-content:center;gap:0}
nav a{padding:18px 15px 17px;text-decoration:none;color:#fff;font-size:14px;line-height:1.35;font-weight:700;position:relative;text-align:center;white-space:nowrap}
nav a small{display:block;margin-top:5px;color:#d6a44b;font-family:Arial,sans-serif;font-size:8px;line-height:1.2;letter-spacing:.03em;font-weight:500;white-space:normal}
nav a:after{content:"";position:absolute;bottom:5px;left:12px;right:12px;height:2px;background:#d6a44b;transform:scaleX(0);transform-origin:center;transition:.2s;pointer-events:none}
nav a:hover:after{transform:scaleX(1)}
.hero{width:100%;background:#fff}
.hero img{display:block;width:min(1000px,100%);height:auto;margin:0 auto}
.event-info{
  width:100%;
  background:#f3f6fb;
  border-bottom:1px solid var(--line);
}
.event-info-inner{
  width:min(1280px, calc(100% - 48px));
  min-height:190px;
  margin:0 auto;
  padding:38px 0;
  display:grid;
  grid-template-columns:1fr 1.2fr 1.2fr;
}
.event-item{padding:0 35px;border-right:1px solid #dce1e9;display:flex;flex-direction:column;justify-content:center}
.event-item:first-child{padding-left:0}
.event-item:last-child{border-right:0}
.event-item .label{color:var(--gold);font-size:13px;letter-spacing:.12em;margin-bottom:5px}
.event-item strong{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;color:var(--navy);font-weight:500;font-size:24px;line-height:1.35}
.event-item:first-child strong{font-family:Georgia,"Times New Roman",serif;font-size:38px;letter-spacing:.04em}
.day{font-family:Arial,sans-serif;font-size:12px;margin-left:5px;letter-spacing:.08em}
.event-item small{margin-top:6px;line-height:1.55;color:#666;font-size:12px}
.section{max-width:1280px;margin:auto;padding:72px 50px}
.section-title{display:flex;align-items:center;gap:50px;margin-bottom:35px}
.section-title span{font-family:Arial,sans-serif;font-weight:800;color:var(--orange);font-size:44px;letter-spacing:.01em}
.section-title h2{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;color:var(--navy);font-weight:500;font-size:28px;margin:0;white-space:nowrap}
.news{display:grid;grid-template-columns:330px 1fr;gap:40px;align-items:start;background:#fff}
.news .section-title{margin:0;white-space:nowrap}
.news-list{border-top:1px solid var(--orange)}
.news-list div{display:grid;grid-template-columns:135px 1fr;gap:20px;padding:18px 0;border-bottom:1px dotted #f07b3b}
.news-list time{color:var(--orange);font-family:Arial,sans-serif;font-weight:bold}
.news-list p{margin:0}
.office{background:#f5f5f5;max-width:none;padding-top:35px;padding-bottom:35px;padding-left:max(50px,calc((100% - 1180px)/2));padding-right:max(50px,calc((100% - 1180px)/2))}
.office-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.office-box{background:transparent;border-top:1px solid #c9cdd6;padding:16px 22px}
.office-box h3{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;color:var(--navy);font-size:16px;font-weight:500;margin:0 0 10px}
.office-box p{margin:0 0 7px;line-height:1.6;font-size:12px}
.office-box a{color:var(--navy);font-weight:bold}
footer{background:var(--navy);color:#fff;padding:22px max(50px,calc((100% - 1180px)/2));display:flex;justify-content:flex-end;align-items:center}
footer small{opacity:.75;font-size:11px}
@media(max-width:900px){
  .header-inner{width:100%;padding:0 20px;display:flex;justify-content:space-between}
  nav{display:none}
  .event-info-inner{width:100%;padding:0;display:grid;grid-template-columns:1fr}
  .event-item,.event-item:first-child{padding:22px 25px;border-right:0;border-bottom:1px solid #ddd}
  .event-item:last-child{border-bottom:0}
  .news{grid-template-columns:1fr;gap:25px}
  .section{padding:55px 25px}
  .office{padding-left:25px;padding-right:25px}
  .office-grid{grid-template-columns:1fr}
  footer{display:block;padding:28px 25px}
  footer small{display:block;margin-top:10px}
}
@media(max-width:600px){
  .hero img{width:100%;height:auto}
  .event-item:first-child strong{font-size:31px}
  .event-item strong{font-size:21px}
  .section-title{gap:18px;align-items:baseline}
  .section-title span{font-size:34px}
  .section-title h2{font-size:22px}
  .news-list div{grid-template-columns:1fr;gap:3px}
}


.menu-toggle{
  display:none;
  width:46px;
  height:42px;
  padding:7px;
  border:1px solid rgba(255,255,255,.45);
  background:transparent;
  cursor:pointer;
  justify-self:end;
}
.menu-toggle span{
  display:block;
  width:25px;
  height:2px;
  margin:5px auto;
  background:#fff;
}

@media (max-width: 1180px) and (min-width: 901px){
  .header-inner{
    grid-template-columns:170px 1fr 40px;
    width:calc(100% - 24px);
  }
  .logo{font-size:29px}
  .logo span{font-size:18px}
  nav a{
    padding-left:10px;
    padding-right:10px;
    font-size:13px;
  }
}

@media (max-width: 900px){
  .header-inner{
    width:100%;
    min-height:70px;
    padding:0 18px;
    display:flex;
    justify-content:space-between;
  }
  .site-logo{justify-self:auto}
  .logo{font-size:29px}
  .logo span{font-size:18px}

  .menu-toggle{
    display:block;
  }

  nav{
    position:absolute;
    top:70px;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    background:#15265e;
    border-top:1px solid rgba(255,255,255,.18);
    box-shadow:0 8px 20px rgba(0,0,0,.15);
    z-index:30;
  }
  nav.is-open{display:flex}
  nav a{
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    min-height:58px;
    padding:10px 18px;
    border-bottom:1px solid rgba(255,255,255,.14);
    font-size:15px;
    line-height:1.35;
    white-space:normal;
  }
  nav a:after{display:none}
}

@media (max-width: 600px){
  .header-inner{padding:0 15px}
  .logo{font-size:26px}
  .logo span{font-size:17px}
  nav{top:70px}
  nav a{font-size:14px;min-height:58px}
  nav a small{font-size:8px;margin-top:3px}
}


/* Sub pages */
.subpage-main{
  min-height:calc(100vh - 170px);
  background:#fff;
}
.page-hero{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto;
  padding:54px 0 28px;
  border-bottom:2px dotted #ef6a32;
}
.page-hero .page-en{
  margin:0 0 4px;
  color:#e95b16;
  font-family:Arial,sans-serif;
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
}
.page-hero h1{
  margin:0;
  color:var(--navy);
  font-family:"Yu Mincho","Hiragino Mincho ProN",serif;
  font-size:32px;
  font-weight:500;
}
.content-list{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto;
}
.content-row{
  padding:42px 18px 46px;
  border-bottom:2px dotted #ef6a32;
}
.content-row h2{
  position:relative;
  margin:0 0 28px;
  padding-left:20px;
  color:#333;
  font-family:"Yu Mincho","Hiragino Mincho ProN",serif;
  font-size:27px;
  font-weight:700;
}
.content-row h2::before{
  content:"";
  position:absolute;
  left:0;
  top:2px;
  width:4px;
  height:30px;
  background:#ed5c18;
}
.content-row p{
  margin:0 0 8px 22px;
  color:#444;
  font-size:17px;
  line-height:1.9;
}
.content-row .muted{
  color:#777;
  font-size:14px;
}
.preparing{
  min-height:420px;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  color:var(--navy);
  font-family:"Yu Mincho","Hiragino Mincho ProN",serif;
  font-size:25px;
}
.preparing-wrap{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto;
}
.preparing-wrap .preparing{
  border-bottom:2px dotted #ef6a32;
}
@media(max-width:600px){
  .page-hero,.content-list,.preparing-wrap{
    width:calc(100% - 30px);
  }
  .page-hero{padding-top:38px}
  .page-hero h1{font-size:27px}
  .content-row{padding:32px 5px 36px}
  .content-row h2{font-size:23px}
  .content-row p{font-size:15px;margin-left:20px}
  .preparing{min-height:300px;font-size:20px}
}


/* Sponsor page */
.sponsor-intro{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto;
  padding:38px 18px 24px;
  font-size:17px;
  line-height:1.9;
}
.sponsor-deadlines{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto 48px;
}
.sponsor-deadlines h2,
.sponsor-contact h2{
  margin:0 0 18px;
  color:var(--navy);
  font-family:"Yu Mincho","Hiragino Mincho ProN",serif;
  font-size:25px;
  font-weight:600;
}
.sponsor-table{
  width:100%;
  border-collapse:collapse;
  border-top:2px solid var(--navy);
}
.sponsor-table th,.sponsor-table td{
  padding:17px 20px;
  border-bottom:1px solid #d9dce3;
  text-align:left;
  line-height:1.65;
  font-size:16px;
}
.sponsor-table th{
  width:42%;
  color:var(--navy);
  background:#f3f6fb;
  font-weight:700;
}
.sponsor-table td{background:#fff}
.sponsor-note{
  margin:12px 0 0;
  color:#666;
  font-size:13px;
  line-height:1.7;
}
.sponsor-downloads{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto 48px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}
.sponsor-download{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:15px;
  padding:23px 26px;
  border:2px solid #15265e;
  border-left:8px solid #b87916;
  border-radius:4px;
  color:#fff;
  text-decoration:none;
  font-size:19px;
  font-weight:800;
  letter-spacing:.02em;
  background:#15265e;
  box-shadow:0 3px 8px rgba(21,38,94,.18);
  transition:background .2s,border-color .2s,transform .2s,box-shadow .2s;
}
.sponsor-download:hover{background:#0d1945;border-color:#0d1945;box-shadow:0 5px 12px rgba(21,38,94,.25);transform:translateY(-1px)}
.sponsor-download:focus-visible{outline:3px solid #e85a0b;outline-offset:3px}
.sponsor-download span:last-child{
  display:inline-block;
  padding:7px 12px;
  border:1px solid rgba(255,255,255,.65);
  border-radius:3px;
  color:#fff;
  font-size:15px;
  font-weight:700;
  white-space:nowrap;
}
.sponsor-contact{
  width:min(1000px, calc(100% - 48px));
  margin:0 auto 60px;
  padding:30px 32px;
  background:#f3f6fb;
  border-top:2px solid var(--gold);
  line-height:1.9;
}
.sponsor-contact p{margin:0 0 5px;font-size:15px}
.sponsor-contact a{color:var(--navy);font-weight:700}
@media(max-width:1180px) and (min-width:901px){
  .header-inner{grid-template-columns:145px 1fr;width:calc(100% - 20px)}
  nav a{padding-left:7px;padding-right:7px;font-size:12px}
  .logo{font-size:27px}
}
@media(max-width:900px){
  .sponsor-intro,.sponsor-deadlines,.sponsor-downloads,.sponsor-contact{width:calc(100% - 30px)}
  .sponsor-downloads{grid-template-columns:1fr}
  .sponsor-table th,.sponsor-table td{padding:13px 12px;font-size:14px}
  .sponsor-table th{width:40%}
  .sponsor-contact{padding:24px 20px}
}


/* Readability refinement: stronger contrast and larger type across all pages */
body{font-size:17px;color:#242424;line-height:1.8}
.header-inner{grid-template-columns:175px minmax(0,1fr);width:min(1480px,calc(100% - 36px));gap:12px}
nav{justify-self:stretch;flex-wrap:wrap;align-content:center}
nav a{font-size:13.5px;font-weight:700;padding:12px 9px;color:#fff;line-height:1.45}
.logo{font-size:32px;font-weight:700}
.page-hero{padding-top:58px;padding-bottom:32px}
.page-hero .page-en{font-size:14px;color:#c64b12;font-weight:800}
.page-hero h1{font-size:36px;font-weight:700;color:#10245a;line-height:1.4}
.content-row h2{font-size:29px;font-weight:800;color:#242424}
.content-row p{font-size:18px;color:#292929;line-height:1.95}
.content-row .muted{font-size:15px;color:#555}
.preparing{font-size:27px;font-weight:600;color:#10245a}
.section-title h2{font-weight:700}
.event-item .label{font-size:14px;color:#895600;font-weight:700}
.event-item strong{font-weight:700}
.event-item small{font-size:14px;color:#444}
.office-box h3{font-size:18px;font-weight:700}
.office-box p{font-size:14px;color:#292929}
footer small{font-size:12px;opacity:.95}
.sponsor-intro{font-size:19px;font-weight:500;color:#252525}
.sponsor-deadlines h2,.sponsor-contact h2{font-size:29px;font-weight:800}
.sponsor-table th,.sponsor-table td{font-size:18px;color:#242424}
.sponsor-table th{color:#10245a}
.sponsor-note{font-size:15px;color:#444}
.sponsor-download{font-size:18px}
.sponsor-download span:last-child{font-size:15px}
.sponsor-contact p{font-size:17px;color:#242424}
@media(max-width:1180px) and (min-width:901px){
 .header-inner{grid-template-columns:145px minmax(0,1fr);width:calc(100% - 20px)}
 nav a{font-size:12.5px;padding:10px 6px}
 .logo{font-size:27px}
}
@media(max-width:900px){
 .header-inner{width:100%;display:flex;justify-content:space-between;gap:0}
 nav{justify-self:auto}
 nav a{font-size:16px;padding:13px 18px;min-height:60px}
 .page-hero h1{font-size:32px}
 .content-row h2{font-size:26px}
 .content-row p{font-size:17px}
 .sponsor-intro{font-size:17px}
 .sponsor-table th,.sponsor-table td{font-size:16px}
 .sponsor-contact p{font-size:16px}
}
@media(max-width:600px){
 .page-hero{padding-top:40px;padding-bottom:25px}
 .page-hero h1{font-size:29px}
 .content-row h2{font-size:24px}
 .content-row p{font-size:16px;line-height:1.9}
 .preparing{font-size:22px}
 .sponsor-intro{font-size:16px;line-height:1.9}
 .sponsor-deadlines h2,.sponsor-contact h2{font-size:24px}
 .sponsor-table th,.sponsor-table td{font-size:15px;padding:13px 10px}
 .sponsor-download{font-size:16px;padding:18px}
 .sponsor-contact p{font-size:15px}
}


/* Header responsive correction: keep the logo and navigation from colliding */
@media (min-width: 1251px){
  .header-inner{
    position:relative;
    width:min(1780px, calc(100% - 72px));
    grid-template-columns:240px minmax(0,1fr);
    gap:24px;
  }
  .site-logo{min-width:0;justify-self:start}
  /* ナビゲーションは画面中央に固定し、ロゴとは独立して整列 */
  .header-inner nav{
    position:absolute;
    left:50%;
    top:50%;
    transform:translate(-50%,-50%);
    width:max-content;
    max-width:calc(100% - 300px);
    display:flex;
    flex-wrap:nowrap;
    align-items:center;
    justify-content:center;
    gap:0;
  }
  .header-inner nav a{padding:12px 8px;font-size:13.5px}
}
@media (max-width: 1250px) and (min-width: 901px){
  .header-inner{
    width:calc(100% - 40px);
    min-height:78px;
    display:flex;
    justify-content:space-between;
    gap:20px;
  }
  .menu-toggle{display:block}
  nav{
    position:absolute;top:78px;left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;
    background:#15265e;border-top:1px solid rgba(255,255,255,.18);
    box-shadow:0 8px 20px rgba(0,0,0,.15);z-index:30;
  }
  nav.is-open{display:flex}
  nav a{font-size:15px;padding:12px 18px;min-height:54px}
}