:root{
  --bg:#0a0d0b;
  --panel:#101411;
  --panel-2:#141a16;
  --text:#f0f5ed;
  --muted:#9aa79d;
  --line:#29322c;
  --accent:#b8ff55;
  --accent-ink:#0a0d0b;
  --secure:#e6fe8b;
  --efficient:#72f6b2;
  --resilient:#a5c8ff;
  --max:1180px;
  --radius:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.55;
}
a{color:inherit}
button,a{font:inherit}
button{color:inherit}
.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--accent-ink);
  padding:.8rem 1rem;z-index:1000
}
.skip-link:focus{left:1rem;top:1rem}
.site-header{
  position:sticky;top:0;z-index:50;
  max-width:var(--max);margin:0 auto;
  background:color-mix(in srgb,var(--bg) 92%,transparent);
  backdrop-filter:blur(12px);
  border-left:1px solid var(--line);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:14px 20px;
  display:flex;align-items:center;justify-content:space-between;gap:20px
}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;min-width:0}
.brand-mark,.brand-sub,.eyebrow,.section-number,.tag,.footer-meta,.track-number,.timeline time,.timeline-row>span{
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  letter-spacing:.05em;
}
.brand-mark{font-weight:900;font-size:.9rem}
.brand-sub{font-size:.68rem;color:var(--muted)}
.site-nav{display:flex;align-items:center;gap:18px;font-family:"SFMono-Regular",Consolas,monospace;font-size:.74rem;text-transform:uppercase}
.site-nav a{text-decoration:none;color:var(--muted)}
.site-nav a:hover,.site-nav a:focus-visible{color:var(--text)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:7px;padding:8px 10px;font-family:monospace}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:11px 18px;border-radius:7px;
  text-decoration:none;font-weight:800;border:1px solid var(--accent);
  background:var(--accent);color:var(--accent-ink);
  cursor:pointer
}
.button:hover{filter:brightness(.94)}
.button:focus-visible,.text-button:focus-visible,.nav-toggle:focus-visible{outline:3px solid rgba(184,255,85,.25);outline-offset:3px}
.button-small{min-height:36px;padding:8px 12px}
.site-nav .button{color:var(--accent-ink)}
.button-ghost{background:transparent;color:var(--text);border-color:var(--line)}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
main,.site-footer{max-width:var(--max);margin:0 auto;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.hero{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1fr) 280px;
  min-height:640px;
  background:linear-gradient(180deg,var(--bg) 0%,#0d110e 100%)
}
.hero::before,.finale-section::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;background:var(--accent);opacity:.75
}
.hero-inner{padding:96px 54px 78px}
.eyebrow,.section-number{font-size:.7rem;color:var(--muted);text-transform:uppercase}
.hero h1,.finale-section h2,.register-section h2{
  margin:18px 0 26px;font-size:clamp(4rem,9vw,7.8rem);
  line-height:.82;letter-spacing:-.07em;font-weight:950
}
.hero-copy{font-size:clamp(1.25rem,2.1vw,1.8rem);max-width:760px}
.hero-note{max-width:670px}
.muted{color:var(--muted)}
.hero-aside{border-left:1px solid var(--line);display:grid;align-content:end;background:var(--panel)}
.hero-aside>div{padding:20px;border-top:1px solid var(--line);display:grid;gap:8px}
.hero-aside span{font:.65rem monospace;color:var(--muted)}
.hero-aside strong{font-size:1rem}
.section-rule,.section-block{padding:72px 54px;border-top:1px solid var(--line)}
.section-rule{display:grid;grid-template-columns:minmax(150px,.65fr) minmax(0,1.35fr);gap:34px}
.section-block{display:block}
.section-heading{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:30px}
h2{font-size:clamp(2.2rem,5vw,4.4rem);line-height:.96;letter-spacing:-.05em;margin:0}
.lead{font-size:1.25rem;max-width:760px}
.track-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.track-card,.mini-card,.ticket-card,.recognition-card,.testimonial-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)
}
.track-card{padding:24px;min-height:360px;display:flex;flex-direction:column}
.track-card:nth-child(1) .track-number{color:var(--secure)}
.track-card:nth-child(2) .track-number{color:var(--efficient)}
.track-card:nth-child(3) .track-number{color:var(--resilient)}
.track-card h3{font-size:1.9rem;line-height:1.02;letter-spacing:-.04em;margin:54px 0 14px}
.track-card>p:not(.track-number){color:var(--muted)}
.text-button{margin-top:auto;padding:18px 0 0;background:none;border:0;border-top:1px solid var(--line);text-align:left;font:700 .72rem monospace;text-transform:uppercase;cursor:pointer}
.track-detail{padding-top:18px}
.track-detail[hidden]{display:none}
.legacy-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:12px;margin-top:30px}
.testimonial-card{margin:0;padding:28px;position:relative}
.testimonial-mark{
  width:54px;height:54px;border-radius:50%;display:grid;place-items:center;
  background:var(--accent);color:var(--accent-ink);font-weight:900;font-size:1.2rem;margin-bottom:34px
}
.testimonial-card>p{font-size:1.22rem;line-height:1.55;margin:0 0 28px}
.testimonial-card footer{display:grid;gap:2px}
.testimonial-card footer span{font-size:.82rem;color:var(--muted)}
.recognition-card{padding:28px}
.recognition-card h3{font-size:1.75rem;line-height:1.04;letter-spacing:-.04em;margin:24px 0 14px}
.text-link{display:inline-block;margin-top:20px;color:var(--accent);font-weight:700;text-decoration:none}
.legacy-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.benefit-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);margin-top:30px}
.benefit-grid>div{padding:20px 18px 20px 0;border-bottom:1px solid var(--line)}
.benefit-grid>div:nth-child(odd){border-right:1px solid var(--line);padding-right:24px}
.benefit-grid>div:nth-child(even){padding-left:24px}
.benefit-grid p,.mini-card p,.ticket-card p,.submission-list p,.judging-grid p,.timeline p{color:var(--muted);font-size:.92rem;margin-bottom:0}
.timeline{border-top:1px solid var(--line)}
.timeline-row{display:grid;grid-template-columns:170px 1fr;gap:20px;padding:21px 0;border-bottom:1px solid var(--line)}
.timeline-row time,.timeline-row>span{font-size:.72rem;color:var(--muted)}
.timeline-row p{margin:.35rem 0}
.timeline-row a{color:var(--accent);font-size:.86rem}
.event-feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.mini-card{padding:22px}
.party-callout{margin:0 54px 72px;padding:44px;border:1px dashed var(--line);border-radius:var(--radius);background:#0f1310}
.party-topline{display:flex;justify-content:space-between;gap:20px;align-items:center}
.tag{font-size:.65rem;padding:7px 10px;border:1px solid var(--accent);border-radius:999px;color:var(--accent)}
.party-callout h2{font-size:clamp(3rem,7vw,6.4rem);margin:18px 0 4px}
.party-subtitle{font-size:1.05rem;text-transform:uppercase;font-weight:800;letter-spacing:.08em}
.bingo-window{display:inline-flex;gap:18px;margin-top:24px;padding:14px 16px;border:1px solid var(--line);border-radius:7px;font-family:monospace;font-size:.78rem}
.submission-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.submission-list li{display:grid;grid-template-columns:60px 1fr;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.submission-list li>span{font:.72rem monospace;color:var(--muted)}
.submission-list p{margin:.3rem 0 0}
.judging-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
.judging-grid>div{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.judging-grid span{display:block;font:700 .8rem monospace;color:var(--accent);margin-bottom:36px}
.judging-grid strong{display:block;font-size:1.2rem}
.finale-section{
  position:relative;
  padding:76px 54px;display:grid;grid-template-columns:1fr 300px;gap:36px;
  border-top:1px solid var(--line);background:linear-gradient(180deg,#0d110e 0%,var(--bg) 100%)
}
.finale-section h2{font-size:clamp(3.4rem,7vw,6.5rem)}
.ticket-card{padding:25px;align-self:end}
.ticket-title{display:block;font-size:2.4rem;line-height:.95;margin:18px 0 28px}
.ticket-card a{color:var(--accent)}
.register-section{padding:100px 54px;text-align:center;border-top:1px solid var(--line)}
.register-section h2{font-size:clamp(3.6rem,8vw,7rem)}
.register-section .lead{margin:0 auto 28px}
.site-footer{
  padding:28px 34px;border-top:1px solid var(--line);
  display:grid;grid-template-columns:1fr 1fr auto;gap:24px;align-items:end;
  color:var(--muted);font-size:.8rem
}
.site-footer p{margin:.3rem 0 0}
.footer-links{display:flex;flex-direction:column;gap:5px}
.footer-links a{text-decoration:none}
.footer-meta{font-size:.68rem}
.link-dialog{
  width:min(520px,calc(100% - 30px));background:var(--panel);color:var(--text);
  border:1px solid var(--line);border-radius:12px;padding:0
}
.link-dialog::backdrop{background:rgba(0,0,0,.72)}
.link-dialog form{padding:30px}
.dialog-close{float:right;background:none;border:0;color:var(--text);font-size:2rem;cursor:pointer}
.link-dialog h2{font-size:2rem}

@media (max-width:900px){
  .brand-sub{display:none}
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--bg);border:1px solid var(--line);padding:16px;flex-direction:column;align-items:stretch}
  .site-nav.open{display:flex}
  .hero{grid-template-columns:1fr}
  .hero-aside{grid-template-columns:repeat(2,1fr);border-left:0;border-top:1px solid var(--line)}
  .hero-aside>div{border-right:1px solid var(--line)}
  .track-grid,.judging-grid{grid-template-columns:1fr}
  .legacy-grid{grid-template-columns:1fr}
  .finale-section{grid-template-columns:1fr}
  .ticket-card{max-width:480px}
}
@media (max-width:700px){
  .site-header{padding:12px 16px}
  .hero-inner,.section-block,.section-rule,.finale-section,.register-section{padding:52px 22px}
  .hero{min-height:auto}
  .hero h1{font-size:clamp(3.6rem,20vw,5.8rem)}
  .section-rule{grid-template-columns:1fr;gap:18px}
  .section-heading{align-items:start;flex-direction:column}
  .track-grid,.event-feature-grid,.benefit-grid{grid-template-columns:1fr}
  .benefit-grid>div:nth-child(odd){border-right:0;padding-right:0}
  .benefit-grid>div:nth-child(even){padding-left:0}
  .timeline-row{grid-template-columns:1fr;gap:6px}
  .party-callout{margin:0 22px 52px;padding:28px 22px}
  .party-topline{align-items:start;flex-direction:column}
  .site-footer{grid-template-columns:1fr;padding:26px 22px}
  .footer-meta{margin-top:8px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}

/* 2025 Green AI retrospective — extends the existing H4E visual system */
.retrospective-hero{padding:72px 54px 64px;border-top:2px solid var(--accent);background:linear-gradient(180deg,var(--bg) 0%,#0d110e 100%)}
.retrospective-kicker{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:54px}
.retrospective-status{font:.68rem "SFMono-Regular",Consolas,monospace;color:var(--accent);border:1px solid var(--line);border-radius:999px;padding:7px 10px;letter-spacing:.06em}
.retrospective-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:54px;align-items:end}
.retrospective-hero h1{margin:0 0 30px;font-size:clamp(4.2rem,9vw,8.4rem);line-height:.8;letter-spacing:-.075em;font-weight:950}
.retrospective-hero em{font-style:normal;color:var(--accent)}
.artifact-card{margin:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#352616;align-self:stretch;display:flex;flex-direction:column;justify-content:space-between}
.artifact-card img{width:100%;aspect-ratio:1/1;object-fit:cover;display:block}
.artifact-card figcaption{display:grid;gap:6px;padding:16px 18px;background:var(--panel);border-top:1px solid var(--line)}
.artifact-card figcaption span{font:.65rem monospace;color:var(--muted);letter-spacing:.06em}
.artifact-card figcaption strong{font-size:.86rem}
.signal-strip{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.signal-strip>div{padding:24px 20px;border-right:1px solid var(--line);min-height:150px}
.signal-strip>div:last-child{border-right:0}
.signal-strip span{font:.64rem monospace;color:var(--muted);letter-spacing:.06em}
.signal-strip strong{display:block;font-size:3rem;line-height:1;margin:20px 0 8px;letter-spacing:-.05em}
.signal-strip p{font-size:.78rem;color:var(--muted);margin:0;line-height:1.35}
.state-section h2,.proof-section h2,.next-section h2{margin:18px 0 26px}
.counterforce-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:34px}
.counterforce-grid article{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:26px;min-height:280px}
.counterforce-grid article:first-child .track-number{color:var(--efficient)}
.counterforce-grid article:last-child .track-number{color:#ffcc74}
.counterforce-grid h3{font-size:2.25rem;line-height:.95;letter-spacing:-.05em;margin:62px 0 16px}
.counterforce-grid p:last-child{color:var(--muted)}
.source-note{margin-top:18px;font:.72rem monospace;color:var(--muted)}
.source-note a,.reference-row a{color:var(--accent);text-decoration:none}
.visual-system-section{background:#0c100d}
.layer-diagram{border-top:1px solid var(--line)}
.layer-card{display:grid;grid-template-columns:86px 1fr;gap:26px;padding:30px 0;border-bottom:1px solid var(--line);align-items:start}
.layer-card>span{font:700 2.2rem monospace;color:var(--line)}
.layer-card h3{font-size:1.8rem;line-height:1.05;letter-spacing:-.035em;margin:6px 0 10px}
.layer-card p:last-child{color:var(--muted);max-width:780px;margin-bottom:0}
.reference-row{display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap;padding-top:20px;font:.72rem monospace}
.proof-flow{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:34px}
.proof-flow>div{padding:22px 16px;border-right:1px solid var(--line);min-height:260px}
.proof-flow>div:last-child{border-right:0}
.proof-flow span{font:.65rem monospace;color:var(--muted)}
.proof-flow strong{display:block;font:700 .78rem monospace;color:var(--accent);margin:48px 0 12px}
.proof-flow p{font-size:.86rem;color:var(--muted);margin:0}
.proof-note{margin-top:28px;border-left:3px solid var(--accent);padding:8px 0 8px 20px}
.proof-note>span{font:.66rem monospace;color:var(--muted)}
.proof-note p{font-size:1.05rem;margin:.45rem 0}
.mission-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.mission-grid article{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);min-height:390px}
.mission-grid article:first-child .track-number{color:var(--efficient)}
.mission-grid article:last-child .track-number{color:var(--resilient)}
.mission-grid h3{font-size:clamp(2.8rem,5.5vw,5.2rem);line-height:.85;letter-spacing:-.06em;margin:90px 0 22px}
.mission-grid p:last-child{color:var(--muted);max-width:500px}
.link-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:32px}
.link-grid a{display:flex;flex-direction:column;min-height:300px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);text-decoration:none}
.link-grid span{font:.65rem monospace;color:var(--muted)}
.link-grid strong{font-size:1.5rem;line-height:1.05;margin:60px 0 12px;letter-spacing:-.03em}
.link-grid p{color:var(--muted);font-size:.9rem;margin:0 0 28px}
.link-grid b{margin-top:auto;color:var(--accent);font:.72rem monospace}

@media (max-width:900px){
  .retrospective-grid{grid-template-columns:1fr}
  .artifact-card{max-width:620px}
  .signal-strip{grid-template-columns:repeat(2,1fr)}
  .signal-strip>div:nth-child(2){border-right:0}
  .signal-strip>div:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .proof-flow{grid-template-columns:1fr 1fr}
  .proof-flow>div{border-bottom:1px solid var(--line)}
  .proof-flow>div:nth-child(even){border-right:0}
  .proof-flow>div:last-child{grid-column:1/-1;border-bottom:0}
  .link-grid{grid-template-columns:1fr}
  .link-grid a{min-height:220px}
}
@media (max-width:700px){
  .retrospective-hero{padding:52px 22px}
  .retrospective-kicker{align-items:flex-start;flex-direction:column;margin-bottom:38px}
  .retrospective-hero h1{font-size:clamp(3.9rem,20vw,6rem)}
  .signal-strip{grid-template-columns:1fr 1fr}
  .signal-strip>div{padding:18px 16px;min-height:130px}
  .signal-strip strong{font-size:2.4rem}
  .counterforce-grid,.mission-grid{grid-template-columns:1fr}
  .counterforce-grid h3{margin-top:42px}
  .layer-card{grid-template-columns:48px 1fr;gap:14px}
  .layer-card>span{font-size:1.5rem}
  .proof-flow{grid-template-columns:1fr}
  .proof-flow>div{border-right:0;min-height:auto}
  .proof-flow>div:last-child{grid-column:auto}
  .proof-flow strong{margin-top:26px}
  .mission-grid article{min-height:330px}
  .mission-grid h3{margin-top:60px}
}


/* 2025 retrospective refinements v0.5 */
.retrospective-grid-tight{align-items:center}
.artifact-stage{
  position:relative;
  min-height:640px;
  border:1px solid var(--line);
  border-radius:calc(var(--radius) + 4px);
  overflow:hidden;
  background:
    radial-gradient(circle at 30% 28%, rgba(184,255,85,.22), transparent 26%),
    radial-gradient(circle at 78% 70%, rgba(184,255,85,.12), transparent 22%),
    linear-gradient(180deg, #162015 0%, #101411 42%, #0b100d 100%);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.02);
}
.artifact-stage::before,
.artifact-stage::after{
  content:"";
  position:absolute;
  border:1px solid rgba(184,255,85,.14);
  border-radius:999px;
  pointer-events:none;
}
.artifact-stage::before{width:760px;height:760px;right:-310px;bottom:-260px}
.artifact-stage::after{width:640px;height:640px;left:-320px;top:-280px}
.artifact-stage img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:contain;
  object-position:center;
  padding:34px;
  filter:drop-shadow(0 34px 54px rgba(0,0,0,.45));
}
.artifact-badge{
  position:absolute;
  top:16px;
  left:16px;
  z-index:2;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:28px;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(10,13,11,.72);
  color:var(--muted);
  font:.65rem monospace;
  letter-spacing:.08em;
}
.artifact-meta{display:grid;gap:6px;padding:14px 6px 0}
.artifact-meta span{font:.66rem monospace;color:var(--muted);letter-spacing:.06em}
.artifact-meta strong{font-size:1rem;line-height:1.2}
.submissions-section{background:#0c100d}
.submission-links-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.submission-links-grid a{
  display:flex;flex-direction:column;min-height:240px;padding:24px;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);text-decoration:none
}
.submission-links-grid span{font:.65rem monospace;color:var(--muted)}
.submission-links-grid strong{font-size:1.45rem;line-height:1.05;margin:46px 0 12px;letter-spacing:-.03em}
.submission-links-grid p{color:var(--muted);font-size:.9rem;margin:0 0 28px}
.submission-links-grid b{margin-top:auto;color:var(--accent);font:.72rem monospace}

@media (max-width:900px){
  .artifact-stage{min-height:520px}
  .submission-links-grid{grid-template-columns:1fr}
}
@media (max-width:700px){
  .artifact-stage{min-height:420px}
  .artifact-stage img{padding:20px}
  .artifact-meta{padding:12px 2px 0}
}


/* v0.7 hero artefact fix: use the preferred designed panel image */
.artifact-stage-reference{
  min-height:auto;
  border:0;
  border-radius:0;
  background:none;
  box-shadow:none;
  overflow:visible;
}
.artifact-stage-reference::before,
.artifact-stage-reference::after,
.artifact-stage-reference .artifact-badge{display:none}
.artifact-stage-reference img{
  position:relative;
  inset:auto;
  width:100%;
  height:auto;
  padding:0;
  border:1px solid var(--line);
  border-radius:calc(var(--radius) + 4px);
  object-fit:cover;
  filter:none;
  display:block;
}
.artifact-stage-reference + .artifact-meta{display:none}