:root{
  /* IACC primary colours */
  --iacc-dark-blue:#006EA0;
  --iacc-light-blue:#1EAFE1;
  --iacc-dark-cobalt:#004B61;
  --iacc-addendum:#3C3C3C;

  /* IACC secondary colours (dark / light pairs) */
  --iacc-cobalt-d:#507A8E;
  --iacc-cobalt-l:#5D7D8F;
  --iacc-steelblue-d:#507A8E;
  --iacc-steelblue-l:#879BAA;
  --iacc-orange-d:#F59B00;
  --iacc-orange-l:#FFCC00;
  --iacc-red-d:#98211E;
  --iacc-red-l:#CD3426;
  --iacc-green-d:#69A525;
  --iacc-green-l:#AFCA05;
  --iacc-grey-d:#878278;
  --iacc-grey-l:#BCB9AF;

  /* Working tokens built from the palette above */
  --ink:var(--iacc-dark-cobalt);
  --paper:#FFFFFF;
  --paper-tint:#F2F8FB;
  --text:#232323;
  --text-muted:#63666A;
  --line:#D9E4EA;

  --plenary:var(--iacc-dark-blue);
  --workshop:var(--iacc-orange-d);
  --break:var(--iacc-grey-d);
  --networking:var(--iacc-green-d);
  --cinema:var(--iacc-steelblue-d);
  --concert:var(--iacc-red-d);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:Corbel, Verdana, sans-serif;
  font-size:16px;
  line-height:1.55;
}
h1,h2,h3{
  font-family:"Cal Sans", Corbel, Verdana, sans-serif;
  font-weight:600;
  color:var(--iacc-dark-cobalt);
  margin:0;
}
a{color:inherit}
.wrap{max-width:920px;margin:0 auto;padding:0 24px}
.wrap-wide{max-width:1160px}

.agenda-layout{
  display:grid;
  grid-template-columns:220px 1fr;
  gap:24px;
  align-items:start;
}
.agenda-sidebar{
  position:sticky;
  top:20px;
}
.agenda-main{min-width:0}
.skip-link{
  position:absolute;left:-9999px;top:0;
  background:var(--iacc-dark-blue);color:#fff;padding:10px 16px;z-index:100;
}
.skip-link:focus{left:12px;top:12px}

/* Header — brand mark requires a white or light-blue background */
.site-header{
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 24px;
}
.brand{
  text-decoration:none;
  display:flex;
  flex-direction:column;
  line-height:1;
}
.brand .logotype{
  font-family:"Cal Sans", Corbel, Verdana, sans-serif;
  font-size:1.7rem;
  font-weight:600;
  letter-spacing:0.01em;
  color:var(--iacc-dark-blue);
}
.brand .addendum{
  margin-top:7px;
  font-size:0.62rem;
  font-weight:700;
  letter-spacing:0.04em;
  color:var(--iacc-addendum);
  text-transform:uppercase;
}
.brand .addendum b{font-weight:700}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a{
  color:var(--iacc-dark-cobalt);
  text-decoration:none;
  font-size:0.95rem;
}
.main-nav a:hover{color:var(--iacc-dark-blue)}
.main-nav a.nav-cta{
  background:var(--iacc-dark-blue);
  color:#fff;
  padding:8px 18px;
}
.main-nav a.nav-cta:hover{background:var(--iacc-dark-cobalt);color:#fff}
.nav-toggle{display:none;background:none;border:0;color:var(--iacc-dark-cobalt);font-size:1.4rem;cursor:pointer}

/* Hero */
.hero{
  background:var(--iacc-dark-cobalt);
  color:#fff;
  padding:56px 0 72px;
  border-bottom:4px solid var(--iacc-light-blue);
}
.hero-dates{
  color:#A9D8E8;
  font-size:0.95rem;
  margin:0 0 14px;
}
.hero h1{
  font-size:clamp(2.2rem, 5vw, 3.1rem);
  color:#fff;
  margin-bottom:16px;
  font-weight:700;
}
.hero-sub{
  max-width:540px;
  color:#CFE6EF;
  font-size:1.05rem;
  margin:0;
}

/* Agenda */
.agenda{padding:56px 0 40px}

/* Filters */
.agenda-filters{
  background:var(--paper-tint);
  border:1px solid var(--line);
  padding:20px;
}
.agenda-sidebar .filter-chips{flex-direction:column;align-items:flex-start}
.agenda-sidebar .chip{width:100%;text-align:left}
.agenda-sidebar .filter-status{flex-direction:column;align-items:flex-start;gap:8px}
.filter-search{
  position:relative;
  margin-bottom:16px;
}
.filter-search svg{
  position:absolute;
  left:12px;
  top:50%;
  transform:translateY(-50%);
  width:16px;
  height:16px;
  color:var(--text-muted);
  pointer-events:none;
}
.filter-search input{
  width:100%;
  font-family:Corbel, Verdana, sans-serif;
  font-size:0.92rem;
  padding:10px 14px 10px 36px;
  border:1px solid var(--line);
  background:#fff;
  color:var(--text);
}
.filter-search input:focus{outline:2px solid var(--iacc-light-blue);outline-offset:-1px}
.filter-group{margin-bottom:14px}
.filter-group:last-of-type{margin-bottom:0}
.filter-label{
  display:block;
  font-size:0.72rem;
  font-weight:700;
  letter-spacing:0.04em;
  text-transform:uppercase;
  color:var(--text-muted);
  margin-bottom:8px;
}
.filter-chips{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.chip{
  font-family:Corbel, Verdana, sans-serif;
  font-size:0.85rem;
  font-weight:600;
  padding:7px 14px;
  border:1px solid var(--line);
  background:#fff;
  color:var(--iacc-dark-cobalt);
  cursor:pointer;
  border-radius:999px;
}
.chip:hover{border-color:var(--iacc-dark-blue)}
.chip.is-active{
  background:var(--iacc-dark-blue);
  border-color:var(--iacc-dark-blue);
  color:#fff;
}
.filter-status{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid var(--line);
  font-size:0.85rem;
  color:var(--text-muted);
}
.filter-clear{
  background:none;
  border:0;
  color:var(--iacc-dark-blue);
  font-family:Corbel, Verdana, sans-serif;
  font-size:0.85rem;
  font-weight:700;
  cursor:pointer;
  padding:0;
}
.filter-clear:hover{text-decoration:underline}
.day-tab .day-tab-count{
  font-size:0.7rem;
  color:var(--text-muted);
}
.day-tab.is-active .day-tab-count{color:#CFE9F5}

.day-tabs{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:2px;
  background:var(--line);
  border:1px solid var(--line);
  margin-bottom:36px;
}
.day-tab{
  background:var(--paper);
  border:0;
  padding:16px 14px;
  text-align:left;
  cursor:pointer;
  display:flex;
  flex-direction:column;
  gap:3px;
  font-family:Corbel, Verdana, sans-serif;
}
.day-tab .day-num{
  font-size:0.75rem;
  color:var(--text-muted);
}
.day-tab .day-date{
  font-family:"Cal Sans", Corbel, Verdana, sans-serif;
  font-size:1.1rem;
  font-weight:600;
  color:var(--iacc-dark-cobalt);
}
.day-tab.is-active{
  background:var(--iacc-dark-blue);
}
.day-tab.is-active .day-num{color:#CFE9F5}
.day-tab.is-active .day-date{color:#fff}
.day-tab:hover:not(.is-active){background:var(--paper-tint)}

.day-panel{display:none}
.day-panel.is-active{display:block;animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

.session-list{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--line);
}
.session{
  display:grid;
  grid-template-columns:96px 1fr;
  gap:24px;
  padding:28px 24px;
  margin:0 -24px;
  border-bottom:1px solid var(--line);
  border-left:4px solid transparent;
}

.session[data-type="plenary"]{
  background:linear-gradient(90deg, rgba(0,110,160,0.07), rgba(0,110,160,0) 65%);
  border-left-color:var(--plenary);
}
.session-time{
  font-size:1rem;
  font-weight:700;
  color:var(--iacc-dark-cobalt);
  padding-top:2px;
  display:flex;
  flex-direction:column;
  line-height:1.4;
}
.session-body h3{
  font-family:"Cal Sans", Corbel, Verdana, sans-serif;
  font-size:1.15rem;
  font-weight:600;
  line-height:1.3;
  margin:0 0 10px;
}
.session-desc{
  margin:0 0 4px;
  color:var(--text-muted);
  font-size:0.95rem;
  max-width:60ch;
}
.is-hidden{display:none}
.desc-full.is-hidden{display:none}
.desc-toggle{
  display:inline-block;
  background:none;
  border:0;
  color:var(--iacc-dark-blue);
  font-family:Corbel, Verdana, sans-serif;
  font-weight:700;
  font-size:0.85rem;
  cursor:pointer;
  padding:0;
  margin:0 0 14px;
}
.desc-toggle:hover{text-decoration:underline}
.session-meta-row{
  display:flex;
  flex-wrap:wrap;
  gap:20px;
  margin-bottom:18px;
}
.meta-item{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--text-muted);
  font-size:0.88rem;
}
.meta-icon{
  width:15px;
  height:15px;
  flex:none;
  color:var(--iacc-light-blue);
}

.session-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0 0 14px;
}
.tag{
  font-family:Corbel, Verdana, sans-serif;
  display:inline-flex;
  align-items:center;
  font-size:0.74rem;
  font-weight:700;
  padding:4px 12px;
  border-radius:999px;
  letter-spacing:0.01em;
  color:#fff;
}
.tag-theme{
  background:var(--paper-tint);
  color:var(--iacc-dark-cobalt);
  border:1px solid var(--line);
  font-weight:600;
}
.type-plenary{background:var(--plenary)}
.type-workshop{background:var(--workshop)}
.type-break{background:var(--break)}
.type-networking{background:var(--networking)}
.type-cinema{background:var(--cinema)}
.type-concert{background:var(--concert)}

.session.is-hidden{display:none}
.day-empty{
  padding:40px 0;
  color:var(--text-muted);
  font-size:0.95rem;
  text-align:center;
  border-top:1px solid var(--line);
  display:none;
}
.day-empty.is-visible{display:block}
.speakers-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px 24px;
}
.speaker{
  display:flex;
  align-items:center;
  gap:12px;
}
.speaker .avatar{
  width:40px;
  height:40px;
  border-radius:50%;
  flex:none;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-size:0.75rem;
  font-weight:700;
}
.speaker div{
  display:flex;
  flex-direction:column;
  gap:1px;
}
.speaker strong{
  font-size:0.92rem;
  color:var(--iacc-dark-cobalt);
  font-weight:700;
}
.speaker .org{
  font-size:0.82rem;
  color:var(--text-muted);
}
.org-full.is-hidden{display:none}
.org-toggle{
  background:none;
  border:0;
  color:var(--iacc-dark-blue);
  font-family:Corbel, Verdana, sans-serif;
  font-weight:700;
  font-size:0.75rem;
  cursor:pointer;
  padding:0;
}
.org-toggle:hover{text-decoration:underline}

/* FAQ */
.faq{padding:48px 0 56px;border-top:1px solid var(--line)}
.faq h2{font-size:1.6rem;margin-bottom:24px;font-weight:700}
.accordion-item{border-bottom:1px solid var(--line)}
.accordion-trigger{
  width:100%;
  background:none;
  border:0;
  text-align:left;
  padding:18px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  cursor:pointer;
  font-family:"Cal Sans", Corbel, Verdana, sans-serif;
  font-size:1rem;
  font-weight:600;
  color:var(--iacc-dark-cobalt);
}
.accordion-icon{
  position:relative;
  width:16px;height:16px;flex:none;
}
.accordion-icon::before,.accordion-icon::after{
  content:"";
  position:absolute;
  background:var(--iacc-dark-blue);
}
.accordion-icon::before{top:7px;left:0;width:16px;height:2px}
.accordion-icon::after{top:0;left:7px;width:2px;height:16px;transition:transform .2s ease}
.accordion-trigger[aria-expanded="true"] .accordion-icon::after{transform:scaleY(0)}
.accordion-panel{padding:0 0 20px;max-width:640px}
.accordion-panel p{margin:0;color:var(--text-muted)}

/* CTA */
.cta{
  background:var(--iacc-dark-blue);
  color:#fff;
  padding:56px 0;
  text-align:center;
}
.cta h2{color:#fff;font-size:1.8rem;margin-bottom:10px;font-weight:700}
.cta p{color:#CFE9F5;margin:0 0 24px}
.btn-primary{
  display:inline-block;
  background:#fff;
  color:var(--iacc-dark-blue);
  text-decoration:none;
  padding:12px 28px;
  font-weight:700;
  font-size:0.95rem;
}
.btn-primary:hover{background:var(--iacc-light-blue);color:#fff}

/* Footer */
.site-footer{padding:28px 0;border-top:1px solid var(--line)}
.site-footer p{margin:0;color:var(--text-muted);font-size:0.85rem}
.site-footer a{color:var(--iacc-dark-blue);text-decoration:none}
.site-footer a:hover{text-decoration:underline}

/* Mobile */
@media (max-width:640px){
  .agenda-layout{grid-template-columns:1fr}
  .agenda-sidebar{position:static}
  .agenda-sidebar .filter-chips{flex-direction:row;align-items:center}
  .agenda-sidebar .chip{width:auto;text-align:center}
  .agenda-sidebar .filter-status{flex-direction:row;align-items:center;justify-content:space-between}
}

@media (min-width:641px) and (max-width:900px){
  .agenda-layout{grid-template-columns:180px 1fr;gap:18px}
  .agenda-sidebar .chip{padding:6px 10px;font-size:0.78rem}
  .filter-label{font-size:0.66rem}
  .agenda-filters{padding:14px}
}

@media (max-width:768px){
  .nav-links{
    display:none;
    position:absolute;
    top:100%;left:0;right:0;
    background:var(--paper);
    border-bottom:1px solid var(--line);
    flex-direction:column;
    padding:8px 24px 20px;
  }
  .js .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .header-inner{position:relative}
  .day-tabs{grid-template-columns:repeat(2, 1fr)}
  .session{grid-template-columns:64px 1fr}
}