:root{
  --navy:#00335E;
  --navy-deep:#001F3D;
  --rust:#B5561D;
  --paper:#F6F4EF;
  --ink:#1A2230;
  --line:#D8D2C4;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:70px;}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  line-height:1.6;
  overflow-x:hidden;
}
h1,h2,h3{font-family:Georgia,"Times New Roman",serif;font-weight:600;margin:0;}
a{color:inherit;}
img{max-width:100%;}
.container{max-width:900px;margin:0 auto;padding:0 24px;}

/* ---------- header / nav ---------- */
header{
  position:sticky;top:0;z-index:10;
  background:var(--navy);color:#fff;
  padding-top:env(safe-area-inset-top,0px);
  border-bottom:3px solid var(--rust);
}
.navwrap{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;max-width:900px;margin:0 auto;flex-wrap:wrap;gap:10px;position:relative;}
.brand{display:block;line-height:0;}
.brand img{height:40px;width:auto;display:block;background:#fff;padding:4px 10px;border-radius:2px;}
nav{display:flex;gap:18px;flex-wrap:wrap;font-size:.92rem;}
nav a{text-decoration:none;opacity:.88;border-bottom:2px solid transparent;padding-bottom:2px;}
nav a:hover{opacity:1;border-color:var(--rust);}

.nav-toggle{
  display:none;background:none;border:1px solid rgba(255,255,255,.4);color:#fff;
  width:40px;height:36px;cursor:pointer;border-radius:4px;position:relative;flex-shrink:0;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:"";position:absolute;left:9px;right:9px;height:2px;background:#fff;transition:transform .2s,opacity .2s;
}
.nav-toggle span{top:17px;}
.nav-toggle span::before{top:-7px;}
.nav-toggle span::after{top:7px;}
.nav-toggle[aria-expanded="true"] span{background:transparent;}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-7px) rotate(-45deg);}

/* ---------- hero ---------- */
.hero{
  background:linear-gradient(180deg,rgba(0,31,61,.92) 0%,rgba(0,31,61,.72) 38%,rgba(0,31,61,.12) 75%),url(images/hero/hero-bg.jpg) center 88%/cover no-repeat,var(--navy-deep);
  color:#fff;padding:64px 24px 260px;
}
.hero .container{max-width:760px;}
.hero p.eyebrow{color:#C98A5E;font-size:.95rem;margin-bottom:10px;}
.hero h1{font-size:2.3rem;line-height:1.2;}
.hero .meta{margin-top:18px;font-size:.98rem;color:#CDD8E5;}

section{padding:52px 0;border-bottom:1px solid var(--line);overflow:hidden;}
section:last-of-type{border-bottom:none;}
h2.section-title{font-size:1.55rem;color:var(--navy);margin-bottom:6px;}
.rule{width:48px;height:3px;background:var(--rust);margin:10px 0 26px;}

.overview p{max-width:70ch;}
.overview .signoff{margin-top:30px;}
.overview .signoff strong{display:block;font-family:Georgia,serif;font-size:1.05rem;}
.overview .signoff span{color:#556;font-size:.92rem;}

.placeholder-note{
  display:inline-block;font-size:.82rem;color:var(--rust);
  border:1px solid var(--rust);border-radius:3px;padding:2px 8px;margin-bottom:18px;
}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;}
.card{border:1px solid var(--line);background:#fff;padding:18px;}
.card h3{font-size:1rem;color:var(--navy);margin-bottom:4px;}
.card p{margin:0;font-size:.9rem;color:#4A5568;}

table{width:100%;border-collapse:collapse;font-size:.92rem;}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);}
th{color:var(--navy);font-weight:600;}

/* ---------- committee ---------- */
.committee-tier h3.group-title{color:var(--rust);font-size:.85rem;letter-spacing:.03em;margin:28px 0 14px;font-weight:700;}
.committee-tier:first-of-type h3.group-title{margin-top:0;}
.committee-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:16px;}
.member{text-align:center;}
.member img{width:78px;height:78px;object-fit:cover;border-radius:50%;border:1px solid var(--line);}
.member .m-name{font-weight:600;font-size:.85rem;margin-top:8px;}
.member .m-role{font-size:.76rem;color:#5A6472;margin-top:1px;}

/* ---------- sponsors ---------- */
.sponsor-tier h3.group-title{color:var(--rust);font-size:.85rem;letter-spacing:.03em;margin:28px 0 14px;font-weight:700;}
.sponsor-tier:first-of-type h3.group-title{margin-top:0;}
.sponsor-logos{display:flex;flex-wrap:wrap;gap:14px;}
.sponsor-logos .logo-tile{
  border:1px solid var(--line);background:#fff;padding:14px 18px;
  display:flex;align-items:center;justify-content:center;min-width:140px;height:76px;
}
.sponsor-logos .logo-tile img{max-width:150px;max-height:48px;width:auto;height:auto;display:block;}

/* ---------- speakers ---------- */
.speaker-group h3.group-title{color:var(--rust);font-size:.85rem;letter-spacing:.03em;margin:28px 0 14px;font-family:-apple-system,BlinkMacSystemFont,sans-serif;font-weight:700;}
.speaker-group:first-of-type h3.group-title{margin-top:0;}
.speaker-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px 24px;}
.speaker{padding:9px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;}
.speaker img, .speaker .ph-circle{width:44px;height:44px;border-radius:50%;object-fit:cover;border:1px solid var(--line);flex-shrink:0;background:#E4DFD3;}
.speaker .name{font-weight:600;font-size:.94rem;}
.speaker .role{font-size:.83rem;color:#5A6472;}

/* ---------- gallery ---------- */
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;}
.ph-img{
  aspect-ratio:4/3;background:repeating-linear-gradient(45deg,#E4DFD3,#E4DFD3 10px,#DAD4C6 10px,#DAD4C6 20px);
  border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
  color:#8a8370;font-size:.8rem;
}
.gal{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;}
.gal button{padding:0;border:0;background:#D9D3C5;cursor:zoom-in;aspect-ratio:3/2;overflow:hidden;display:block;width:100%;}
.gal img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .25s;}
.gal button:hover img{transform:scale(1.04);}

/* ---------- agenda ---------- */
.ag-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px;}
.ag-tabs button{font:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--navy);padding:8px 16px;}
.ag-tabs.days button{font-weight:600;}
.ag-tabs button[aria-selected="true"]{background:var(--navy);color:#fff;border-color:var(--navy);}
.ag-tabs.tracks button[aria-selected="true"]{background:var(--rust);border-color:var(--rust);}
.ag-date{font-family:Georgia,serif;color:var(--navy);margin:18px 0 6px;font-size:1.05rem;}
.ag-item{display:grid;grid-template-columns:96px 1fr;gap:14px;padding:12px 0;border-bottom:1px solid var(--line);}
.ag-time{font-weight:700;font-size:.9rem;color:var(--navy);}
.ag-time small{display:block;font-weight:400;color:#5A6472;font-size:.78rem;}
.ag-title{font-weight:600;font-size:.96rem;}
.ag-meta{font-size:.8rem;color:#5A6472;margin-top:2px;}
.ag-meta .badge{color:var(--rust);border:1px solid var(--rust);padding:0 6px;border-radius:3px;margin-right:6px;font-size:.72rem;}
.ag-spk{font-size:.85rem;margin-top:4px;}
.ag-item.common{background:#EFEBE2;padding-left:10px;padding-right:10px;}

/* ---------- lightbox ---------- */
#lb{position:fixed;inset:0;z-index:50;background:rgba(0,10,20,.94);display:none;align-items:center;justify-content:center;
  padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px);}
#lb.open{display:flex;}
#lb img{max-width:94vw;max-height:84vh;object-fit:contain;}
#lb .lb-btn{position:absolute;background:rgba(255,255,255,.14);color:#fff;border:0;font-size:1.6rem;line-height:1;width:44px;height:44px;cursor:pointer;border-radius:50%;}
#lb .lb-btn:hover{background:rgba(255,255,255,.28);}
#lb .lb-x{top:calc(14px + env(safe-area-inset-top,0px));right:14px;}
#lb .lb-p{left:12px;top:50%;margin-top:-22px;}
#lb .lb-n{right:12px;top:50%;margin-top:-22px;}
#lb .lb-c{position:absolute;bottom:calc(14px + env(safe-area-inset-bottom,0px));left:0;right:0;text-align:center;color:#CDD8E5;font-size:.85rem;}

/* ================= RESPONSIVE ================= */

/* Tablet */
@media (max-width:860px){
  .container{max-width:100%;}
  .hero h1{font-size:2rem;}
}

/* Mobile nav collapses into a hamburger-driven dropdown */
@media (max-width:700px){
  .nav-toggle{display:block;order:2;}
  .brand{order:1;}
  nav{
    display:none;order:3;width:100%;
    flex-direction:column;gap:0;
    background:var(--navy-deep);
    margin:10px -24px -14px;
    border-top:1px solid rgba(255,255,255,.12);
  }
  nav.open{display:flex;}
  nav a{padding:12px 24px;border-bottom:1px solid rgba(255,255,255,.1);opacity:1;}
  nav a:hover{border-color:rgba(255,255,255,.1);background:rgba(255,255,255,.05);}
}

@media (max-width:600px){
  .hero h1{font-size:1.6rem;}
  .hero{padding:44px 20px 200px;background-position:center,58% 100%;}
  .ag-item{grid-template-columns:76px 1fr;gap:10px;}
  .container{padding:0 18px;}
  section{padding:40px 0;}
}

@media (max-width:480px){
  .committee-grid{grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:12px;}
  .member img{width:64px;height:64px;}
  .speaker-list{grid-template-columns:1fr;}
  .gal{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px;}
  .sponsor-logos{gap:10px;}
  .sponsor-logos .logo-tile{min-width:100px;height:62px;padding:8px 10px;}
  .sponsor-logos .logo-tile img{max-width:110px;max-height:38px;}
  h2.section-title{font-size:1.3rem;}
  .hero h1{font-size:1.4rem;}
  #lb .lb-btn{width:38px;height:38px;font-size:1.3rem;}
}