:root{
  --green-900:#0f3d2e;
  --green-800:#155e42;
  --green-700:#1c7a53;
  --green-600:#238a5f;
  --green-100:#e7f3ec;
  --sand-100:#f7f5ef;
  --ink-900:#1c2521;
  --ink-600:#4b5a53;
  --line:#dde5df;
  --white:#ffffff;
  --max:1120px;
  --status-adjust:#8a6d3b;
  --status-adjust-bg:#f8f1e3;
  --status-coop:#1f5f8b;
  --status-coop-bg:#e8f2f8;
  --status-join:#1c7a53;
  --status-join-bg:#e7f3ec;
  --status-plan:#5a6470;
  --status-plan-bg:#eef1f4;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:"Hiragino Kaku Gothic ProN","Yu Gothic",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink-900);
  background:var(--white);
  line-height:1.85;
  font-size:16px;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;}
img{max-width:100%;display:block;}

/* Header */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,0.96);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;max-width:var(--max);margin:0 auto;
  position:relative;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0;}
.brand-mark{
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--green-700),var(--green-900));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:14px;letter-spacing:0.5px;
  flex-shrink:0;
}
.brand-text{line-height:1.3;min-width:0;}
.brand-text .ja{font-size:14px;font-weight:700;color:var(--green-900);white-space:normal;}
.brand-text .en{font-size:11px;color:var(--ink-600);letter-spacing:1px;}
@media (max-width:480px){
  .brand-text .ja{font-size:12px;}
  .brand-text .en{display:none;}
}
nav ul{display:flex;gap:18px;list-style:none;flex-wrap:wrap;justify-content:flex-end;}
nav a{font-size:13px;font-weight:600;color:var(--ink-600);transition:color .2s;}
nav a:hover{color:var(--green-800);}

.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;border:none;background:none;cursor:pointer;flex-shrink:0;
}
.nav-toggle span{display:block;width:100%;height:2px;background:var(--green-900);border-radius:2px;transition:transform .2s, opacity .2s;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

@media (max-width:1080px){
  .nav-toggle{display:flex;}
  nav ul{
    position:absolute;top:100%;left:0;right:0;
    display:flex;flex-direction:column;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    box-shadow:0 12px 24px rgba(15,61,46,0.08);
    max-height:0;overflow:hidden;opacity:0;
    transition:max-height .25s ease, opacity .2s ease;
  }
  nav.open ul{max-height:720px;opacity:1;}
  nav ul li{border-top:1px solid var(--line);}
  nav ul li a{display:block;padding:14px 24px;}
}

/* Hero */
.hero{
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,0.10), transparent 40%),
    linear-gradient(135deg,var(--green-900) 0%, var(--green-700) 55%, var(--green-600) 100%);
  color:#fff;
  padding:96px 0 80px;
  position:relative;
  overflow:hidden;
}
.hero::after{
  content:"";
  position:absolute;right:-120px;bottom:-140px;
  width:420px;height:420px;border-radius:50%;
  background:rgba(255,255,255,0.06);
}
.hero .wrap{position:relative;z-index:1;}
.hero-inner{display:grid;grid-template-columns:1.15fr 0.85fr;gap:44px;align-items:center;}
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;}
  .hero-visual{max-width:280px;margin:0 auto 12px;order:-1;}
}
.eyebrow{
  display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:2px;
  background:rgba(255,255,255,0.14);border:1px solid rgba(255,255,255,0.3);
  padding:6px 14px;border-radius:999px;margin-bottom:22px;
}
.hero h1.org-name{
  font-size:clamp(25px,3.6vw,36px);
  font-weight:800;line-height:1.45;margin-bottom:12px;
  max-width:640px;
}
.org-name-en{
  font-size:12.5px;letter-spacing:1.5px;text-transform:uppercase;
  color:rgba(255,255,255,0.7);margin-bottom:24px;
}
.hero-catch{
  font-size:17.5px;font-weight:700;color:#fff;margin-bottom:14px;line-height:1.7;max-width:600px;
}
.hero p.lead{
  font-size:15px;color:rgba(255,255,255,0.85);max-width:600px;margin-bottom:32px;
}
.hero-visual svg{width:100%;height:auto;filter:drop-shadow(0 20px 34px rgba(0,0,0,0.20));}

.photo-banner{position:relative;height:440px;overflow:hidden;background:linear-gradient(135deg,#1c5f6e,#0f3d2e);}
.photo-banner img{width:100%;height:100%;object-fit:cover;display:block;}
.photo-banner::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(15,61,46,0.05) 0%, rgba(15,61,46,0.15) 55%, rgba(15,61,46,0.65) 100%);
}
.photo-caption{
  position:absolute;left:0;right:0;bottom:36px;z-index:2;text-align:center;padding:0 24px;
}
.photo-caption p{
  color:#fff;font-size:clamp(17px,2.2vw,22px);font-weight:800;
  text-shadow:0 2px 10px rgba(0,0,0,0.35);letter-spacing:0.5px;
}
.photo-caption span{
  display:block;margin-top:8px;font-size:12.5px;font-weight:400;color:rgba(255,255,255,0.75);
}
@media (max-width:700px){.photo-banner{height:300px;}}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;}
.btn{
  display:inline-block;padding:13px 26px;border-radius:8px;font-weight:700;font-size:14.5px;
  transition:all .2s;border:none;cursor:pointer;
}
.btn-primary{background:#fff;color:var(--green-800);}
.btn-primary:hover{background:var(--green-100);}
.btn-outline{border:1.5px solid rgba(255,255,255,0.6);color:#fff;}
.btn-outline:hover{background:rgba(255,255,255,0.12);}
.btn-solid{background:var(--green-700);color:#fff;}
.btn-solid:hover{background:var(--green-800);}
.btn[aria-disabled="true"],.btn.is-disabled{
  opacity:0.55;pointer-events:none;cursor:not-allowed;
}

section{padding:88px 0;}
section.alt{background:var(--sand-100);}
.section-head{max-width:680px;margin-bottom:48px;}
.kicker{
  font-size:12.5px;font-weight:700;color:var(--green-700);letter-spacing:2px;
  text-transform:uppercase;margin-bottom:12px;display:block;
}
h2{font-size:clamp(22px,3vw,30px);font-weight:800;color:var(--green-900);margin-bottom:14px;}
.section-head p{color:var(--ink-600);font-size:15px;}
.note{font-size:13px;color:var(--ink-600);margin-top:18px;}

.about-grid{display:grid;grid-template-columns:1.1fr 0.9fr;gap:48px;align-items:start;}
@media (max-width:860px){.about-grid{grid-template-columns:1fr;}}
.about-text p{margin-bottom:16px;color:var(--ink-900);font-size:15px;}
.fact-card{
  background:var(--white);border:1px solid var(--line);border-radius:14px;
  padding:28px;box-shadow:0 4px 18px rgba(15,61,46,0.06);
}
.fact-card h3{font-size:14px;color:var(--green-800);margin-bottom:14px;font-weight:800;}
.fact-list{list-style:none;}
.fact-list li{
  padding:10px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--ink-600);
  display:flex;justify-content:space-between;gap:12px;
}
.fact-list li:last-child{border-bottom:none;}
.fact-list b{color:var(--ink-900);font-weight:700;text-align:right;}

.principle-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;}
@media (max-width:960px){.principle-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.principle-grid{grid-template-columns:1fr;}}
.principle-card{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 20px;text-align:center;
  transition:transform .2s, box-shadow .2s;
}
.principle-card:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(15,61,46,0.10);}
.principle-num{
  width:36px;height:36px;border-radius:50%;background:var(--green-100);color:var(--green-800);
  display:flex;align-items:center;justify-content:center;font-weight:800;margin:0 auto 14px;
}
.principle-card h4{font-size:14.5px;font-weight:800;color:var(--green-900);margin-bottom:8px;}
.principle-card p{font-size:13px;color:var(--ink-600);}

.flow{display:flex;align-items:stretch;gap:0;flex-wrap:wrap;}
.flow-step{
  flex:1;min-width:150px;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:24px 18px;text-align:center;position:relative;margin:6px;
}
.flow-step .n{
  width:30px;height:30px;border-radius:50%;background:var(--green-800);color:#fff;font-weight:800;
  display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:13px;
}
.flow-step h4{font-size:13.5px;font-weight:800;color:var(--green-900);}
.flow-arrow{display:flex;align-items:center;color:var(--green-600);font-size:20px;padding:0 4px;}
@media (max-width:820px){.flow{flex-direction:column;}.flow-arrow{transform:rotate(90deg);justify-content:center;padding:6px 0;}}

.org-wrap{background:#fff;border:1px solid var(--line);border-radius:16px;padding:44px 24px;text-align:center;}
.org-box{
  display:inline-block;background:var(--green-100);color:var(--green-900);font-weight:700;
  padding:12px 26px;border-radius:8px;font-size:14px;margin:6px;border:1px solid var(--green-600);
}
.org-box.main{background:var(--green-800);color:#fff;border-color:var(--green-800);}
.org-line{color:var(--green-600);font-size:14px;margin:2px 0;}
.org-sub-row{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:10px;}
.role-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px;}
@media (max-width:820px){.role-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.role-grid{grid-template-columns:1fr;}}
.role-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;}
.role-card h4{font-size:14px;color:var(--green-800);font-weight:800;margin-bottom:8px;}
.role-card p{font-size:13.5px;color:var(--ink-600);}

.member-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
@media (max-width:900px){.member-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.member-grid{grid-template-columns:1fr;}}
.member-card{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px 22px;
  border-top:4px solid var(--green-700);
}
.member-card h4{font-size:15px;font-weight:800;color:var(--green-900);margin-bottom:10px;}
.member-card p{font-size:13.5px;color:var(--ink-600);}

.plan-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px;}
@media (max-width:700px){.plan-list{grid-template-columns:1fr;}}
.plan-list li{
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 18px;font-size:14.5px;
  display:flex;gap:12px;align-items:flex-start;color:var(--ink-900);
}
.plan-list li::before{
  content:"";flex-shrink:0;width:8px;height:8px;border-radius:50%;background:var(--green-600);margin-top:8px;
}

.kpi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
@media (max-width:820px){.kpi-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.kpi-grid{grid-template-columns:1fr;}}
.kpi-card{background:var(--green-900);color:#fff;border-radius:12px;padding:22px;font-size:14px;}
.kpi-card b{display:block;font-size:13px;color:var(--green-100);margin-bottom:6px;letter-spacing:1px;}

.charter-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px 32px;}
.charter-box details{border-bottom:1px solid var(--line);padding:16px 0;}
.charter-box details:last-child{border-bottom:none;}
.charter-box summary{
  cursor:pointer;font-weight:700;font-size:14.5px;color:var(--green-900);list-style:none;
  display:flex;justify-content:space-between;align-items:center;
}
.charter-box summary::-webkit-details-marker{display:none;}
.charter-box summary::after{content:"+";font-size:20px;color:var(--green-600);font-weight:400;}
.charter-box details[open] summary::after{content:"–";}
.charter-box details p{margin-top:10px;font-size:13.5px;color:var(--ink-600);}

.cta{
  background:linear-gradient(135deg,var(--green-800),var(--green-900));
  color:#fff;border-radius:20px;padding:56px 40px;text-align:center;
}
.cta h2{color:#fff;}
.cta p{color:rgba(255,255,255,0.85);max-width:560px;margin:0 auto 28px;font-size:14.5px;}
.cta .contact-mail{display:block;margin-top:14px;font-size:14px;color:rgba(255,255,255,0.9);}

footer{background:var(--green-900);color:rgba(255,255,255,0.75);padding:52px 0 28px;font-size:13px;}
.footer-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;margin-bottom:24px;}
.footer-grid-rich{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:28px;}
@media (max-width:860px){.footer-grid-rich{grid-template-columns:1fr;gap:28px;}}
.footer-grid .brand-text .ja,.footer-col .brand-text .ja{color:#fff;}
.footer-grid .brand-text .en,.footer-col .brand-text .en{color:rgba(255,255,255,0.6);}
.footer-copy{margin-top:14px;line-height:1.7;color:rgba(255,255,255,0.7);max-width:420px;}
.footer-heading{color:#fff;font-size:13px;font-weight:800;margin:0 0 10px;letter-spacing:0.5px;}
.footer-col p{margin:0 0 16px;line-height:1.7;}
.footer-col a{color:rgba(255,255,255,0.85);}
.footer-col a:hover{color:#fff;}
.footer-links{list-style:none;display:grid;gap:8px;}
.footer-links a{color:rgba(255,255,255,0.75);font-size:13px;}
.footer-links a:hover{color:#fff;}
footer nav ul{display:flex;gap:20px;list-style:none;flex-wrap:wrap;}
footer nav a{color:rgba(255,255,255,0.75);font-size:13px;}
footer nav a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.15);padding-top:18px;
  display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
  color:rgba(255,255,255,0.5);text-align:left;
}
.footer-updated{font-weight:600;color:rgba(255,255,255,0.7);}

/* News */
.news-section{
  background:linear-gradient(180deg,#f4f8f5 0%, #ffffff 100%);
  border-bottom:1px solid var(--line);
  padding:56px 0 64px;
}
.news-head{margin-bottom:28px;}
.news-list{
  list-style:none;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:0 8px 24px rgba(15,61,46,0.06);
}
.news-item{
  display:grid;grid-template-columns:120px 1fr;gap:18px;align-items:start;
  padding:18px 22px;border-bottom:1px solid var(--line);font-size:14.5px;
}
.news-item:last-child{border-bottom:none;}
.news-item-featured{
  background:var(--green-100);
  border-left:4px solid var(--green-700);
}
.news-item-featured .news-body{font-weight:700;color:var(--green-900);}
.news-date{color:var(--green-700);font-weight:700;font-size:13px;letter-spacing:0.5px;}
.news-body{color:var(--ink-900);}
@media (max-width:560px){
  .news-section{padding:40px 0 48px;}
  .news-item{grid-template-columns:1fr;gap:6px;padding:16px 18px;}
}

/* Status badges */
.status{
  display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:0.4px;
  padding:4px 10px;border-radius:999px;white-space:nowrap;
}
.status-adjust{background:var(--status-adjust-bg);color:var(--status-adjust);}
.status-coop{background:var(--status-coop-bg);color:var(--status-coop);}
.status-join{background:var(--status-join-bg);color:var(--status-join);}
.status-plan{background:var(--status-plan-bg);color:var(--status-plan);}
.status-prep{background:#eef6f1;color:var(--green-800);}
.status-active{background:#e7f3ec;color:var(--green-900);}
.status-done{background:#edf0f2;color:#445055;}

/* Partners */
.partner-group{margin-bottom:34px;}
.partner-group h3{
  font-size:16px;font-weight:800;color:var(--green-900);margin-bottom:14px;
  padding-bottom:8px;border-bottom:2px solid var(--green-100);
}
.partner-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
@media (max-width:700px){.partner-cards{grid-template-columns:1fr;}}
.partner-card{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;
  display:flex;justify-content:space-between;gap:14px;align-items:flex-start;
}
.partner-card .name{font-size:14.5px;font-weight:700;color:var(--ink-900);margin-bottom:4px;}
.partner-card .desc{font-size:13px;color:var(--ink-600);}

/* Project theme cards */
.theme-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px;}
@media (max-width:900px){.theme-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.theme-grid{grid-template-columns:1fr;}}
.theme-card{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;
  display:flex;flex-direction:column;gap:12px;min-height:170px;
}
.theme-card h4{font-size:15px;font-weight:800;color:var(--green-900);}
.theme-card p{font-size:13.5px;color:var(--ink-600);flex:1;}

/* Activity */
.activity-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
@media (max-width:800px){.activity-grid{grid-template-columns:1fr;}}
.activity-panel{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 24px;
}
.activity-panel h3{font-size:16px;font-weight:800;color:var(--green-900);margin-bottom:16px;}
.activity-panel ul{list-style:none;}
.activity-panel li{
  position:relative;padding:10px 0 10px 18px;border-bottom:1px solid var(--line);
  font-size:14px;color:var(--ink-900);
}
.activity-panel li:last-child{border-bottom:none;}
.activity-panel li::before{
  content:"";position:absolute;left:0;top:18px;width:7px;height:7px;border-radius:50%;background:var(--green-600);
}

/* Documents */
.doc-list{list-style:none;display:grid;grid-template-columns:1fr;gap:12px;}
.doc-item{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
}
.doc-item .title{font-size:14.5px;font-weight:700;color:var(--ink-900);}
.doc-item .meta{font-size:12.5px;color:var(--ink-600);margin-top:2px;}
.doc-link{
  font-size:13px;font-weight:700;color:var(--green-800);border:1px solid var(--green-600);
  padding:8px 14px;border-radius:8px;background:var(--green-100);white-space:nowrap;
}
.doc-pending{
  font-size:12.5px;font-weight:700;color:var(--status-plan);
  background:var(--status-plan-bg);padding:8px 14px;border-radius:8px;white-space:nowrap;
}
@media (max-width:560px){
  .doc-item{align-items:stretch;}
  .doc-link,.doc-pending{width:100%;text-align:center;}
  .btn-row .btn{width:100%;text-align:center;}
  .cta{padding:40px 22px;}
}

/* Join steps */
.join-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:28px;}
@media (max-width:900px){.join-steps{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.join-steps{grid-template-columns:1fr;}}
.join-step{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 18px;
}
.join-step .n{
  width:28px;height:28px;border-radius:50%;background:var(--green-800);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;margin-bottom:10px;
}
.join-step h4{font-size:14px;font-weight:800;color:var(--green-900);margin-bottom:6px;}
.join-step p{font-size:13px;color:var(--ink-600);}
.join-actions{margin-top:28px;display:flex;gap:12px;flex-wrap:wrap;}