:root{
  --red:#b91c1c; --red-dark:#7f1d1d; --red-soft:#ef4444;
  --ink:#1f2937; --muted:#6b7280; --line:#f0d9d9;
  --bg:#fffaf7; --card:#ffffff;
  --maxw:1100px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%;overflow-x:hidden;}
body{
  margin:0; color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background-color:var(--bg);
  background-image:
    radial-gradient(circle at 16% 8%, rgba(185,28,28,.10), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(185,28,28,.07), transparent 40%);
  background-repeat:no-repeat; background-attachment:fixed; min-height:100vh;
  line-height:1.6; overflow-x:hidden;
}
a{color:inherit;}
img{max-width:100%;}
.wrap{width:min(var(--maxw),100% - 32px);margin:0 auto;}

/* ===== Topbar ===== */
header.bar{position:sticky;top:0;z-index:50;backdrop-filter:saturate(1.4) blur(10px);
  background:rgba(255,250,247,.82);border-bottom:1px solid var(--line);}
.bar-in{display:flex;align-items:center;gap:14px;height:62px;}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;color:var(--red-dark);}
.brand img{width:34px;height:34px;border-radius:50%;}
.brand .bt{font-size:15px;letter-spacing:.3px;line-height:1.05;}
.brand .bt small{display:block;font-size:10px;color:var(--muted);font-weight:700;letter-spacing:.5px;}
nav.links{margin-left:auto;display:flex;gap:4px;align-items:center;}
nav.links a{display:inline-block;padding:8px 12px;border-radius:999px;font-size:14px;font-weight:700;color:#5b4a4a;text-decoration:none;transition:.15s;}
nav.links a:hover{color:var(--red);background:rgba(185,28,28,.07);}
nav.links a.active{color:var(--red);background:rgba(185,28,28,.10);}
.lang{margin-left:6px;border:1px solid var(--line);background:#fff;color:var(--red);font-weight:800;font-size:13px;
  padding:7px 12px;border-radius:999px;cursor:pointer;transition:.15s;}
.lang:hover{background:var(--red);color:#fff;}
.menu-btn{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;width:40px;height:38px;font-size:18px;cursor:pointer;}
@media(max-width:820px){
  nav.links{display:none;position:absolute;top:62px;left:0;right:0;flex-direction:column;gap:0;
    background:rgba(255,250,247,.98);border-bottom:1px solid var(--line);padding:8px 16px;}
  nav.links.open{display:flex;}
  nav.links a{padding:12px 8px;border-radius:10px;}
  .menu-btn{display:block;}
  .lang{order:3;}
}

/* ===== Sections ===== */
section{padding:48px 0;}
.hero{padding-top:34px;}
.hero-grid{display:flex;align-items:center;gap:30px;flex-wrap:wrap;
  background:linear-gradient(135deg,#fff 0%,#fff6f4 100%);
  border:1px solid var(--line);border-radius:26px;padding:clamp(24px,4vw,46px);
  box-shadow:0 24px 64px rgba(185,28,28,.10);position:relative;overflow:hidden;}
.hero-grid::before{content:"";position:absolute;right:-90px;top:-100px;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(185,28,28,.12),transparent 65%);pointer-events:none;}
.hero-txt{flex:1 1 340px;min-width:0;}
.eyebrow{margin:0 0 14px;font-size:12px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;
  background:linear-gradient(90deg,#b91c1c,#ef4444,#7f1d1d);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero h1{margin:0 0 16px;line-height:1.08;}
.hero h1 .l1{display:block;font-size:clamp(34px,7vw,64px);font-weight:900;letter-spacing:1px;
  background:linear-gradient(100deg,#7f1d1d,#b91c1c 45%,#ef4444);-webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 8px 26px rgba(185,28,28,.14);}
.hero h1 .l2{display:block;font-size:clamp(16px,3vw,24px);font-weight:800;color:var(--red-dark);margin-top:6px;}
.hero p.lead{margin:0;color:var(--muted);font-size:clamp(14px,2.4vw,16.5px);max-width:560px;}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px;}
.btn{text-decoration:none;font-size:15px;font-weight:800;padding:13px 24px;border-radius:999px;transition:.16s;display:inline-flex;align-items:center;gap:8px;cursor:pointer;border:none;}
.btn.primary{color:#fff;background:var(--red);box-shadow:0 12px 26px rgba(185,28,28,.24);}
.btn.primary:hover{background:#a01818;transform:translateY(-1px);}
.btn.ghost{color:var(--red);border:1px solid var(--line);background:#fff;}
.btn.ghost:hover{border-color:var(--red);transform:translateY(-1px);}
.hero-art{flex:0 0 auto;display:flex;align-items:center;justify-content:center;}
.hero-art img{height:clamp(180px,28vw,300px);width:auto;display:block;
  filter:drop-shadow(0 18px 30px rgba(185,28,28,.20));animation:floaty 5s ease-in-out infinite;}
@keyframes floaty{0%,100%{transform:translateY(0);}50%{transform:translateY(-12px);}}
@media(prefers-reduced-motion:reduce){.hero-art img{animation:none;}}

/* ===== Page hero (subpages) ===== */
.page-head{padding:42px 0 6px;}
.page-head .eyebrow{margin-bottom:8px;}
.page-head h1{margin:0;font-size:clamp(28px,5vw,44px);font-weight:900;color:#111827;}
.page-head p{color:var(--muted);margin:12px 0 0;max-width:680px;font-size:15.5px;}

/* ===== Section heading ===== */
.sec-head{display:flex;align-items:center;gap:12px;margin:0 0 22px;}
.sec-head h2{margin:0;font-size:clamp(22px,3.6vw,30px);color:#111827;font-weight:900;}
.sec-head .chip{font-size:12px;color:var(--red);background:rgba(185,28,28,.08);border:1px solid var(--line);padding:4px 12px;border-radius:999px;letter-spacing:.06em;font-weight:700;}
.sec-head .ln{flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent);}
.sec-sub{color:var(--muted);margin:-8px 0 26px;font-size:15px;max-width:720px;}
.prose{max-width:760px;color:#374151;font-size:16px;line-height:1.95;}
.prose p{margin:0 0 16px;}
.prose .hl{color:var(--red);font-weight:800;}
.prose .slogan{font-size:clamp(20px,3.4vw,26px);font-weight:900;color:var(--red-dark);margin:22px 0;}

/* ===== Portal cards ===== */
.portals{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;}
.pcard{position:relative;overflow:hidden;display:block;text-decoration:none;color:inherit;
  background:var(--card);border:1px solid var(--line);border-radius:20px;padding:26px;transition:.18s;}
.pcard:hover{transform:translateY(-4px);box-shadow:0 20px 44px rgba(185,28,28,.14);border-color:#e7b9b9;}
.pcard .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;font-size:24px;margin-bottom:14px;
  background:linear-gradient(135deg,#fee2e2,#fff);border:1px solid var(--line);}
.pcard h3{margin:0 0 6px;font-size:19px;font-weight:800;color:#111827;}
.pcard p{margin:0;color:var(--muted);font-size:14px;}
.pcard .go{margin-top:16px;font-weight:800;color:var(--red);font-size:14px;}

/* ===== Departments ===== */
.depts{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px;}
.dept{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;transition:.16s;}
.dept:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(185,28,28,.10);}
.dept .e{font-size:24px;}
.dept .t{font-weight:800;margin:8px 0 4px;color:#111827;}
.dept .d{font-size:13px;color:var(--muted);}

/* ===== Activities ===== */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px;}
.act{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;flex-direction:column;
  text-decoration:none;color:inherit;transition:.18s;}
.act:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(185,28,28,.12);}
.act .cover{width:100%;aspect-ratio:16/9;object-fit:cover;background:#f3e8e8;display:block;}
.act .body{padding:14px;display:flex;flex-direction:column;gap:6px;flex:1;}
.act .t{font-weight:800;font-size:16px;color:#111827;}
.act .m{font-size:12px;color:#9ca3af;}
.act .d{font-size:13px;color:var(--muted);}
.skeleton{height:230px;border-radius:18px;background:linear-gradient(100deg,#f6eaea 30%,#fbf3f3 50%,#f6eaea 70%);
  background-size:200% 100%;animation:sk 1.2s infinite;}
@keyframes sk{from{background-position:200% 0;}to{background-position:-200% 0;}}
.empty{grid-column:1/-1;text-align:center;padding:48px 20px;border:1px dashed var(--line);border-radius:18px;background:rgba(255,255,255,.6);color:var(--muted);}
.more-row{text-align:center;margin-top:24px;}

/* ===== Team / members ===== */
.dept-block{margin-bottom:34px;}
.dept-block .dh{display:flex;align-items:center;gap:10px;margin:0 0 16px;}
.dept-block .dh .e{font-size:22px;}
.dept-block .dh h3{margin:0;font-size:20px;font-weight:900;color:#111827;}
.dept-block .dh .ln{flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent);}
.members{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;}
.mcard{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;transition:.16s;display:flex;flex-direction:column;gap:8px;}
.mcard:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(185,28,28,.10);}
.mcard .role{align-self:flex-start;font-size:11px;font-weight:800;letter-spacing:.05em;color:var(--red);background:rgba(185,28,28,.08);border:1px solid var(--line);padding:3px 10px;border-radius:999px;}
.mcard .nm{font-weight:900;font-size:18px;color:#111827;}
.mcard .nm span{font-weight:700;font-size:14px;color:var(--muted);margin-left:6px;}
.mcard .tag{font-size:12.5px;color:var(--muted);line-height:1.5;flex:1;}
.mcard .prof{margin-top:4px;font-weight:800;font-size:13px;color:var(--red);text-decoration:none;}
.mcard .prof:hover{text-decoration:underline;}

/* ===== Connect / social ===== */
.social{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;}
.sc{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:14px;text-decoration:none;color:inherit;cursor:pointer;transition:.16s;text-align:left;font:inherit;}
.sc:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(185,28,28,.10);border-color:#e7b9b9;}
.sc .si{width:38px;height:38px;border-radius:11px;flex:0 0 auto;display:grid;place-items:center;color:#fff;font-weight:900;font-size:15px;}
.sc .sn{display:block;font-weight:800;font-size:14px;color:#111827;line-height:1.2;}
.sc .sh{display:block;font-size:12px;color:var(--muted);}

/* ===== Sponsors ===== */
.sponsors img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:18px;}
.coop{margin-top:18px;display:flex;gap:12px;flex-wrap:wrap;}
.coop .pill{background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 16px;font-size:14px;font-weight:700;color:#5b4a4a;}
.coop .pill b{color:var(--red);}

/* ===== Contact ===== */
.contact{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;}
.ccard{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;}
.ccard h3{margin:0 0 10px;font-size:17px;color:#111827;}
.ccard p{margin:6px 0;font-size:14px;color:var(--muted);}
.ccard b{color:var(--ink);}
.qr-pair{display:flex;gap:14px;flex-wrap:wrap;margin-top:6px;}
.qr-pair figure{margin:0;text-align:center;}
.qr-pair img{width:128px;height:128px;object-fit:contain;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:zoom-in;}
.qr-pair figcaption{font-size:12px;color:var(--muted);margin-top:6px;}

/* ===== Footer ===== */
footer.foot{border-top:1px solid var(--line);padding:30px 0;margin-top:20px;color:var(--muted);font-size:13px;}
.foot-in{display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:space-between;}
.foot-in a{color:var(--red);text-decoration:none;font-weight:700;}

/* ===== Lightbox ===== */
.lb{position:fixed;inset:0;background:rgba(31,41,55,.72);display:none;align-items:center;justify-content:center;z-index:100;padding:20px;}
.lb.open{display:flex;}
.lb-card{background:#fff;border-radius:18px;padding:18px;max-width:340px;width:100%;text-align:center;box-shadow:0 30px 80px rgba(0,0,0,.4);}
.lb-card img{width:100%;height:auto;border-radius:10px;}
.lb-card .cap{font-weight:800;margin:10px 0 2px;color:#111827;}
.lb-card .sub{font-size:13px;color:var(--muted);}
.lb-close{margin-top:12px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 18px;font-weight:800;color:var(--red);cursor:pointer;}

/* ===== Toast ===== */
#toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%) translateY(20px);opacity:0;
  background:#111827;color:#fff;padding:11px 20px;border-radius:999px;font-size:14px;font-weight:700;z-index:120;
  transition:.25s;pointer-events:none;}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ===== Minimal line icons ===== */
.pcard .ic{color:var(--red);}
.pcard .ic svg{width:26px;height:26px;display:block;}
.dept .e{color:var(--red);line-height:0;height:26px;display:flex;align-items:center;}
.dept .e svg{width:26px;height:26px;display:block;}
.dept-block .dh .e{color:var(--red);line-height:0;display:inline-flex;align-items:center;}
.dept-block .dh .e svg{width:24px;height:24px;display:block;}

/* ===== Social brand logos ===== */
.sc .si img{width:21px;height:21px;display:block;}

/* ===== Team avatars ===== */
.mcard{flex-direction:row;flex-wrap:wrap;align-items:flex-start;}
.mcard .av{flex:0 0 auto;width:60px;height:60px;border-radius:14px;object-fit:cover;object-position:center top;
  background:#f3e8e8;border:1px solid var(--line);}
.mcard .av.ph{display:grid;place-items:center;color:var(--red);font-weight:900;font-size:20px;background:linear-gradient(135deg,#fee2e2,#fff);}
.mcard .mc-main{flex:1 1 150px;min-width:0;display:flex;flex-direction:column;gap:7px;}

/* ===== i18n: only hide the inactive language; never override the shown one's display ===== */
html:not([lang="en"]) [data-en]{display:none;}
html[lang="en"] [data-zh]{display:none;}

/* ===== Mobile refinements ===== */
@media(max-width:640px){
  section{padding:34px 0;}
  .hero{padding-top:20px;}
  .hero-grid{gap:22px;padding:22px;border-radius:20px;}
  .hero-art{width:100%;}
  .hero-art img{height:clamp(150px,42vw,210px);}
  .page-head{padding:30px 0 4px;}
  .sec-head{gap:10px;margin-bottom:18px;}
  .sec-head .ln{display:none;}          /* 细分割线在窄屏留白更干净 */
  .sec-sub{margin-bottom:20px;}
  .portals,.grid,.depts,.members,.social,.contact{gap:12px;}
  .qr-pair{gap:10px;justify-content:center;}
  .foot-in{justify-content:center;text-align:center;flex-direction:column;gap:8px;}
}
@media(max-width:520px){
  /* CTA 按钮整行更好点按 */
  .cta{flex-direction:column;align-items:stretch;}
  .cta .btn{width:100%;justify-content:center;}
  .more-row .btn{width:100%;box-sizing:border-box;justify-content:center;}
  /* 社交卡片单列，避免文字被挤压 */
  .social{grid-template-columns:1fr;}
  /* 表单操作区纵向排列 */
  .mf-actions{flex-direction:column;align-items:flex-start;}
  .mf-actions .btn{width:100%;box-sizing:border-box;justify-content:center;}
}
/* 表单输入统一 ≥16px，避免 iOS 聚焦时自动放大 */
input,textarea,select{font-size:16px;}