:root{
  --paper:#EFEDE6; --ink:#163247; --body:#354E60; --muted:#646B6F; --rule:#C9C5B8;
  --stone:#E4E8E6; --maple:#A8432F; --deep:#0F2535;
  --narrow:"Archivo Narrow","Arial Narrow",sans-serif;
  --sans:"IBM Plex Sans",system-ui,sans-serif;
  --jp:"IBM Plex Sans JP","Hiragino Sans",sans-serif;
  --gutter:clamp(16px,3.2vw,48px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--paper);color:var(--body);font:400 17px/1.6 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
:focus-visible{outline:2px solid var(--maple);outline-offset:3px}
html{scroll-padding-top:104px}
@media(max-width:760px){html{scroll-padding-top:130px}}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:var(--ink);color:#fff;padding:8px 12px;z-index:99}
.wrap{padding:0 var(--gutter);max-width:1600px;margin:0 auto}
.jp{font-family:var(--jp)}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(239,237,230,.88);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:5px solid var(--ink);border-bottom:1px solid transparent;transition:border-color .2s}
.site-header.scrolled{border-bottom-color:var(--rule)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-top:16px;padding-bottom:16px}
/* Network lockup, exactly as on airc.network (Fraunces + Georgia burgundy ampersand + Inter NETWORK). Scale with --u. */
.lockup{display:inline-flex;flex-direction:column;color:#002147;--u:.62;text-decoration:none}
.lockup .top{display:flex;align-items:flex-end;gap:calc(14px*var(--u))}
.lockup .ai{font-family:Fraunces,Georgia,serif;font-weight:600;font-size:calc(64px*var(--u));line-height:.78;letter-spacing:.01em;font-variation-settings:"opsz" 144}
.lockup .stack{display:flex;flex-direction:column;justify-content:space-between;align-self:stretch}
.lockup .l{font-family:Fraunces,Georgia,serif;font-weight:600;font-size:calc(23px*var(--u));line-height:1;font-variation-settings:"opsz" 60;white-space:nowrap}
.lockup .amp{font-family:Georgia,"Times New Roman",serif;color:#7a1828}
.lockup .frule{height:calc(1.5px*var(--u));background:#002147;opacity:.4;margin-top:calc(9px*var(--u))}
.lockup .net{display:flex;justify-content:space-between;margin-top:calc(7px*var(--u));font-family:Inter,sans-serif;font-weight:500;font-size:calc(10.5px*var(--u));opacity:.82}
.site-header nav{display:flex;align-items:center;gap:26px;font-size:13.5px;color:var(--ink)}
.site-header nav a{text-decoration:none}
.site-header nav a:hover{color:var(--maple)}
.lang{display:flex;gap:6px;color:var(--muted);font-size:12.5px}
.lang b{color:var(--ink);font-weight:500}
.btn{display:inline-flex;align-items:center;gap:14px;background:var(--ink);color:#fff!important;text-decoration:none;font-size:14px;font-weight:500;padding:13px 20px;border:0;transition:background .2s}
.btn:hover{background:var(--deep)}
.btn .arr{font-size:13px;opacity:.8}
.btn.sm{padding:10px 16px;font-size:13px}

/* hero */
.hero{padding-top:clamp(36px,6vw,80px)}
.presents{font-size:13px;color:var(--muted);margin-bottom:clamp(14px,2vw,22px)}
.hero-top{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:start}
h1{font-family:var(--narrow);font-weight:500;color:var(--ink);font-size:clamp(56px,9.6vw,152px);line-height:.93;letter-spacing:-.035em}
.facts{display:grid;grid-template-columns:auto auto;gap:0 44px;font-size:14px;line-height:1.45;color:var(--ink);padding-top:clamp(6px,1vw,14px)}
.facts span{display:block;color:var(--muted)}
.plate{position:relative;margin-top:clamp(28px,4vw,52px);border-radius:14px;overflow:hidden;background:#EFEDE6;aspect-ratio:2.35/1;min-height:300px}
.plate svg{position:absolute;inset:0;width:100%;height:100%;display:block}
.plate-cap{position:absolute;left:clamp(18px,2.4vw,32px);bottom:clamp(16px,2.2vw,28px);color:var(--ink);font-size:13px;display:flex;align-items:center;gap:10px}
.plate-cap i{width:8px;height:8px;background:var(--maple);display:inline-block}
.plate-jp{position:absolute;right:clamp(18px,2.4vw,32px);top:clamp(16px,2.2vw,28px);writing-mode:vertical-rl;color:var(--ink);font-size:13px;letter-spacing:.25em}
.hero-actions{display:flex;align-items:center;gap:28px;margin-top:28px;flex-wrap:wrap}
.tlink{color:var(--ink);text-decoration:none;font-size:14.5px;border-bottom:1px solid var(--ink);padding-bottom:3px}
.tlink:hover{color:var(--maple);border-color:var(--maple)}

/* section grammar */
.sec{border-top:1px solid var(--rule);margin-top:clamp(80px,10vw,150px);padding-top:clamp(18px,2vw,26px);display:grid;grid-template-columns:1fr 2fr;gap:clamp(24px,4vw,64px)}
.sec h2{font-family:var(--narrow);font-weight:500;color:var(--ink);font-size:clamp(40px,5vw,76px);line-height:1;letter-spacing:-.03em}
.sec h2 .jp{display:block;font-family:var(--jp);font-size:13px;letter-spacing:.12em;color:var(--muted);margin-top:14px;font-weight:400}
.label{font-size:13px;color:var(--muted)}
.big{font-size:clamp(22px,2.3vw,32px);line-height:1.32;color:var(--muted);letter-spacing:-.01em;max-width:30em}
.big strong{color:var(--ink);font-weight:400}

/* numbered reasons */
.intro{font-size:19px;color:var(--ink);max-width:36em;margin-bottom:34px;line-height:1.5}
.reasons{list-style:none;border-top:1px solid var(--rule)}
.reasons li{display:grid;grid-template-columns:70px 1fr 2fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--rule)}
.reasons .n{font-family:var(--narrow);font-size:22px;color:var(--muted)}
.reasons h3{font-family:var(--narrow);font-weight:500;font-size:26px;color:var(--ink);line-height:1.1}
.reasons p{max-width:36em}

/* comparison */
.who{font-size:19px;line-height:1.55;color:var(--ink);max-width:36em}
.compare{margin-top:40px;width:100%;border-collapse:collapse;font-size:16px}
.compare th{text-align:left;font-weight:500;font-size:13px;color:var(--muted);padding:0 0 12px;border-bottom:1px solid var(--ink)}
.compare td{padding:16px 24px 16px 0;border-bottom:1px solid var(--rule);vertical-align:top;width:50%}
.compare td:first-child{color:var(--muted)}
.compare td:last-child{color:var(--ink)}

/* agenda */
.agenda-note{margin-bottom:22px}
.day{display:grid;grid-template-columns:1fr 1fr;gap:0;padding:22px 0 26px;border-top:1px solid var(--rule)}
.day:first-of-type{border-top-color:var(--ink)}
.day h3{font-family:var(--narrow);font-weight:500;font-size:clamp(26px,2.4vw,34px);color:var(--ink);line-height:1.05}
.tag{display:inline-flex;align-items:center;gap:8px;margin-top:12px;font-size:12.5px;color:var(--body);border:1px solid var(--rule);padding:3px 9px 3px 7px;background:#fff}
.tag i{width:9px;height:9px;display:inline-block}
.day ul{list-style:none;color:var(--ink);font-size:16px;line-height:1.45}
.day li{padding:3px 0}
.day li em{font-style:normal;color:var(--muted)}

/* formats */
.formats{border-top:1px solid var(--ink)}
.fmt{display:grid;grid-template-columns:1fr 2fr;gap:24px;padding:18px 0;border-bottom:1px solid var(--rule)}
.fmt b{font-weight:500;color:var(--ink)}

/* statement */
.statement{margin-top:clamp(80px,10vw,150px);background:var(--ink);color:var(--stone);border-radius:14px;padding:clamp(32px,5vw,72px);display:grid;grid-template-columns:1fr 2fr;gap:clamp(24px,4vw,64px);position:relative;overflow:hidden}
.statement h2{font-family:var(--narrow);font-weight:500;font-size:clamp(40px,5vw,76px);line-height:1;letter-spacing:-.03em;color:#fff}
.statement h2 .jp{display:block;font-family:var(--jp);font-size:13px;letter-spacing:.12em;color:#9FB2BF;margin-top:14px;font-weight:400}
.statement .mark{width:44px;height:3px;background:var(--maple);margin-bottom:28px}
.statement p{font-size:clamp(20px,2vw,27px);line-height:1.4;color:#C9D4DB;max-width:28em}
.statement p strong{color:#fff;font-weight:400}
.statement .tlink{color:#fff;border-color:#fff;display:inline-block;margin-top:34px}
.statement .tlink:hover{color:#E9A493;border-color:#E9A493}

/* invite */
.groups{list-style:none;display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink)}
.groups li{padding:16px 0;border-bottom:1px solid var(--rule);color:var(--ink);font-size:18px;display:flex;gap:14px}
.groups li span{color:var(--muted);font-family:var(--narrow);width:26px}
.never{margin-top:26px;font-size:16px;color:var(--ink);display:flex;gap:12px;align-items:center}
.never i{width:8px;height:8px;background:var(--maple);flex-shrink:0}

/* cfp */
.cfp p{font-size:19px;line-height:1.55;color:var(--ink);max-width:32em;margin-bottom:28px}

/* involve */
.involve-lead{font-size:19px;color:var(--ink);margin-bottom:24px}
.routes{border-top:1px solid var(--ink)}
.route{display:grid;grid-template-columns:140px 1fr auto;gap:24px;align-items:baseline;padding:22px 0;border-bottom:1px solid var(--rule);text-decoration:none;transition:padding .2s}
.route:hover{padding-left:8px}
.route .k{font-family:var(--narrow);font-size:28px;color:var(--ink);font-weight:500}
.route .t b{display:block;color:var(--ink);font-weight:500;font-size:17px}
.route .t{color:var(--body)}
.route .go{color:var(--ink);font-size:18px}
.route:hover .go,.route:hover .k{color:var(--maple)}

footer{margin-top:clamp(90px,11vw,160px);border-top:1px solid var(--ink)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:22px;padding-bottom:40px;font-size:13px;color:var(--muted)}
footer a{text-decoration:none}footer a:hover{color:var(--ink)}

/* responsive */
@media (max-width:1000px){
  .site-header nav{gap:18px}
  .reasons li{grid-template-columns:50px 1fr}
  .reasons li p{grid-column:2}
}
@media (max-width:760px){
  .site-header .wrap{flex-wrap:wrap;gap:14px}
  .site-header nav{width:100%;gap:16px;font-size:12.5px;flex-wrap:wrap}
  .site-header .wrap{position:relative}
  .site-header nav .btn{position:absolute;right:var(--gutter);top:19px}
  .hero-top{grid-template-columns:1fr}
  .facts{gap:0 32px}
  .plate{aspect-ratio:4/5;min-height:0}
  .sec,.statement{grid-template-columns:1fr}
  .day,.fmt{grid-template-columns:1fr;gap:12px}
  .groups{grid-template-columns:1fr}
  .route{grid-template-columns:1fr auto}
  .route .t{grid-column:1/-1;grid-row:2}
  .compare td{padding-right:14px;font-size:15px}
}

/* Register interest form */
.reg{display:grid;grid-template-columns:1fr 2fr;gap:clamp(24px,4vw,72px);margin-top:clamp(36px,5vw,72px);padding-bottom:clamp(60px,8vw,110px)}
.reg h1{font-family:var(--narrow);font-weight:500;font-size:clamp(44px,5.4vw,84px);line-height:1;letter-spacing:-.03em;color:var(--ink)}
.reg-lead{margin-top:20px;max-width:24em;color:var(--body)}
.reg-back{display:inline-block;margin-top:26px}
.fset{border:0;padding:0;margin:0 0 30px;min-width:0}
.fset legend,.f label{font-size:14px;font-weight:500;color:var(--ink);padding:0}
.fset legend{margin-bottom:10px}
.choice{display:grid;grid-template-columns:20px 1fr;gap:12px;align-items:start;padding:14px 0;border-top:1px solid var(--rule);cursor:pointer}
.choice:last-child{border-bottom:1px solid var(--rule)}
.choice input{width:18px;height:18px;margin:3px 0 0;accent-color:var(--ink)}
.choice b{display:block;font-weight:500;color:var(--ink)}
.choice span span{display:block;font-size:14.5px;color:var(--muted)}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
.f{margin-bottom:22px;min-width:0}
.f label{display:block;margin-bottom:7px}
.f .opt{font-weight:400;color:var(--muted)}
.f input,.f select,.f textarea{width:100%;font:400 16px/1.4 var(--sans);color:var(--ink);background:#FBFAF7;border:1px solid #7F7B6C;border-radius:0;padding:11px 12px}
.f input,.f select{height:46px}
.f select{appearance:none;-webkit-appearance:none;padding-right:36px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%23163247' stroke-width='1.5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 13px center}
.f input:focus-visible,.f select:focus-visible,.f textarea:focus-visible,.choice input:focus-visible,.reg button:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.f [aria-invalid="true"]{border-color:var(--maple);box-shadow:inset 0 0 0 1px var(--maple)}
.f.check{display:grid;grid-template-columns:20px 1fr;gap:12px;align-items:start}
.f.check input{width:18px;height:18px;margin:2px 0 0;padding:0;accent-color:var(--ink)}
.f.check label{font-weight:400;margin:0;color:var(--body);font-size:15px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-error{color:var(--maple);font-size:15px;margin-bottom:16px}
.reg button.btn{cursor:pointer;font-family:var(--sans)}
.reg button[disabled]{opacity:.6;cursor:default}
.done h2{font-family:var(--narrow);font-weight:500;font-size:clamp(32px,3.6vw,52px);line-height:1.05;letter-spacing:-.02em;color:var(--ink);margin-bottom:14px}
.done:focus{outline:0}
.done .tlink{display:inline-block;margin-top:22px}
@media (max-width:760px){.reg{grid-template-columns:1fr}.frow{grid-template-columns:1fr}}

/* Alignment pass (2026-11-10) */
.day>div{padding-right:24px}
.sec h2,.statement h2{text-wrap:balance}
.lang .jp{cursor:default}
body:has(.reg) footer{margin-top:0}
@media(min-width:761px){.formats,.groups{border-top:0;margin-top:-18px}.groups{margin-top:-16px}}
@media(max-width:760px){.day>div{padding-right:0}.site-header nav{gap:14px}}