/* ========================================================
   日本水環境学会関西支部 - リニューアルデモサイト
   ======================================================== */
:root{
  --primary:#0a6199;
  --primary-dark:#063f65;
  --primary-light:#e8f3fa;
  --accent:#2fb5c4;
  --accent2:#5aa93f;
  --bg:#f4f8fb;
  --card:#ffffff;
  --text:#22303a;
  --muted:#5c6b76;
  --border:#dde7ee;
  --radius:14px;
  --shadow:0 6px 24px rgba(10,72,110,.08);
  --shadow-hover:0 10px 30px rgba(10,72,110,.15);
  --maxw:1180px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans JP","Hiragino Sans","Yu Gothic",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--primary);text-decoration:none;}
a:hover{color:var(--accent);}
ul{margin:0;padding:0;}
h1,h2,h3,h4{line-height:1.5;margin:0 0 .6em;font-weight:700;}
p{margin:0 0 1em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ---------- top bar ---------- */
.topbar{background:var(--primary-dark);color:#cfe6f4;font-size:12.5px;padding:6px 0;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;}
.topbar a{color:#cfe6f4;}

/* ---------- header ---------- */
header.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(10,72,110,.05);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:var(--maxw);margin:0 auto;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{width:52px;height:52px;border-radius:50%;background:conic-gradient(from 210deg,var(--primary),var(--accent),var(--primary));display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:inset 0 0 0 3px #fff, 0 0 0 2px var(--primary-light);}
.brand-mark span{color:#fff;font-weight:700;font-size:14px;letter-spacing:.5px;}
.brand-text .en{font-size:11px;color:var(--muted);letter-spacing:.5px;}
.brand-text .ja{font-size:17px;font-weight:700;color:var(--primary-dark);}
.brand-text .ja small{font-size:12px;font-weight:500;color:var(--muted);display:block;}

nav.main-nav{display:flex;}
nav.main-nav>ul{display:flex;gap:2px;list-style:none;}
nav.main-nav>ul>li{position:relative;}
nav.main-nav>ul>li>a{display:block;padding:12px 14px;font-size:14.5px;font-weight:600;color:var(--text);border-radius:8px;}
nav.main-nav>ul>li>a:hover,nav.main-nav>ul>li.active>a{background:var(--primary-light);color:var(--primary);}
.dropdown{position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-hover);min-width:210px;padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s;}
nav.main-nav>ul>li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0);}
.dropdown a{display:block;padding:9px 12px;font-size:13.5px;border-radius:7px;color:var(--text);}
.dropdown a:hover{background:var(--primary-light);color:var(--primary);}

.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px;}
.hamburger span{width:24px;height:2.5px;background:var(--primary-dark);border-radius:2px;}

/* ---------- hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden;}
.hero img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,42,66,.35),rgba(6,42,66,.78));}
.hero-inner{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:110px 24px 90px;}
.hero.small .hero-inner{padding:56px 24px;}
.hero-inner .eyebrow{display:inline-block;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.4);padding:4px 14px;border-radius:99px;font-size:12.5px;letter-spacing:.08em;margin-bottom:16px;}
.hero-inner h1{font-size:clamp(26px,4vw,42px);margin-bottom:14px;}
.hero-inner p{font-size:15.5px;max-width:640px;color:#eaf4fa;}

/* ---------- breadcrumb ---------- */
.breadcrumb{background:#fff;border-bottom:1px solid var(--border);}
.breadcrumb .wrap{padding:12px 24px;font-size:13px;color:var(--muted);}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--primary);}

/* ---------- sections ---------- */
main{display:block;}
.section{padding:64px 0;}
.section.tight{padding:40px 0;}
.section.alt{background:#fff;}
.section-head{margin-bottom:36px;}
.section-head .tag{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:.1em;text-transform:uppercase;}
.section-head h2{font-size:clamp(22px,3vw,30px);color:var(--primary-dark);}
.section-head p{color:var(--muted);max-width:680px;}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:.2s;}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);}
.card .card-img{aspect-ratio:16/10;overflow:hidden;}
.card .card-img img{width:100%;height:100%;object-fit:cover;}
.card .card-body{padding:22px;}
.card .card-body h3{font-size:17px;color:var(--primary-dark);}
.card .card-body p{color:var(--muted);font-size:14.5px;margin-bottom:0;}

.grid{display:grid;gap:26px;}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-2{grid-template-columns:repeat(2,1fr);}
.grid.cols-4{grid-template-columns:repeat(4,1fr);}

.btn{display:inline-flex;align-items:center;gap:8px;background:var(--primary);color:#fff;padding:12px 24px;border-radius:99px;font-weight:600;font-size:14.5px;border:0;cursor:pointer;}
.btn:hover{background:var(--primary-dark);color:#fff;}
.btn.outline{background:#fff;color:var(--primary);border:1.5px solid var(--primary);}
.btn.outline:hover{background:var(--primary-light);}
.btn.sm{padding:8px 16px;font-size:13px;}

.info-list{list-style:none;}
.info-list li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--border);align-items:baseline;}
.info-list li:last-child{border-bottom:0;}
.info-list .date{flex:0 0 118px;color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums;}
.info-list .tag-pill{flex:0 0 auto;font-size:11.5px;background:var(--primary-light);color:var(--primary);padding:3px 10px;border-radius:99px;font-weight:700;margin-right:4px;}
.info-list a{color:var(--text);font-weight:500;}
.info-list a:hover{color:var(--primary);}

.stat-row{display:flex;gap:40px;flex-wrap:wrap;}
.stat{text-align:left;}
.stat .num{font-size:32px;font-weight:800;color:var(--primary);}
.stat .label{font-size:13px;color:var(--muted);}

.callout{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-radius:var(--radius);padding:40px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;}
.callout h3{margin-bottom:6px;font-size:20px;}
.callout p{color:#dcecf5;margin:0;}

table.simple{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
table.simple th,table.simple td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--border);font-size:14.5px;}
table.simple th{background:var(--primary-light);color:var(--primary-dark);width:190px;font-weight:700;}
table.simple tr:last-child td{border-bottom:0;}

.doc-box{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);}
.doc-box h4{color:var(--primary-dark);font-size:16px;border-left:4px solid var(--accent);padding-left:12px;}
.doc-box ol,.doc-box ul.plain{padding-left:22px;color:var(--text);font-size:14.5px;}
.doc-box ol li,.doc-box ul.plain li{margin-bottom:.6em;}

.tabs{display:flex;gap:8px;margin-bottom:28px;border-bottom:2px solid var(--border);}
.tab-btn{background:none;border:0;padding:12px 20px;font-size:15px;font-weight:700;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;}
.tab-btn.active{color:var(--primary);border-color:var(--primary);}
.tab-panel{display:none;}
.tab-panel.active{display:block;}

.people-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.person{background:#fff;border:1px solid var(--border);border-radius:10px;padding:16px 18px;display:flex;justify-content:space-between;gap:12px;}
.person .role{font-size:12px;color:var(--accent);font-weight:700;}
.person .name{font-weight:700;font-size:15px;}
.person .org{font-size:12.5px;color:var(--muted);}

.pdf-archive{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.pdf-card{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px;box-shadow:var(--shadow);display:flex;gap:14px;align-items:flex-start;}
.pdf-ico{flex:0 0 44px;height:44px;border-radius:9px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px;}
.pdf-card .t{font-weight:700;font-size:14.5px;}
.pdf-card .d{font-size:12px;color:var(--muted);}

.notice-box{background:var(--primary-light);border:1px solid #cfe3f0;border-radius:var(--radius);padding:22px 26px;font-size:14.5px;}
.notice-box strong{color:var(--primary-dark);}

/* ---------- footer ---------- */
footer.site-footer{background:var(--primary-dark);color:#bcdcee;margin-top:60px;}
.footer-top{padding:48px 0 30px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;}
.footer-grid h5{color:#fff;font-size:14px;margin-bottom:14px;}
.footer-grid ul{list-style:none;font-size:13.5px;}
.footer-grid li{margin-bottom:9px;}
.footer-grid a{color:#bcdcee;}
.footer-grid a:hover{color:#fff;}
.footer-brand p{color:#9dc3d9;font-size:13px;max-width:280px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;font-size:12px;color:#7fa9c0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}

.demo-badge{position:fixed;bottom:18px;right:18px;background:#e2691a;color:#fff;font-size:12px;font-weight:700;padding:9px 16px;border-radius:99px;box-shadow:0 6px 18px rgba(0,0,0,.25);z-index:200;letter-spacing:.03em;}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .grid.cols-3,.grid.cols-4{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .pdf-archive{grid-template-columns:1fr 1fr;}
}
@media(max-width:760px){
  nav.main-nav{position:fixed;top:0;right:-100%;width:82%;max-width:340px;height:100vh;background:#fff;flex-direction:column;padding:80px 22px 22px;box-shadow:-8px 0 30px rgba(0,0,0,.15);transition:.25s;overflow-y:auto;}
  nav.main-nav.open{right:0;}
  nav.main-nav>ul{flex-direction:column;width:100%;}
  nav.main-nav>ul>li>a{padding:13px 10px;border-bottom:1px solid var(--border);border-radius:0;}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-radius:0;display:none;background:var(--bg);margin-left:10px;}
  nav.main-nav>ul>li.mob-open .dropdown{display:block;}
  .hamburger{display:flex;}
  .topbar .wrap{font-size:11px;}
  .grid.cols-3,.grid.cols-4,.grid.cols-2{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .people-grid{grid-template-columns:1fr;}
  .pdf-archive{grid-template-columns:1fr;}
  .callout{flex-direction:column;align-items:flex-start;}
  table.simple th{width:120px;font-size:13px;}
  .hero-inner{padding:70px 20px 56px;}
}