/* ICETCIS 2027 — Conference site stylesheet */

:root{
  --navy-900:#06162f;
  --navy-800:#0b2545;
  --navy-700:#123a6b;
  --navy-600:#1a4d8f;
  --gold-500:#c9a227;
  --gold-400:#dab94a;
  --bg:#f6f7f9;
  --surface:#ffffff;
  --ink:#1b2330;
  --ink-soft:#4a5568;
  --line:#e2e6ec;
  --radius:10px;
  --maxw:1180px;
  --shadow:0 4px 18px rgba(11,37,69,0.08);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Georgia","Cambria","Times New Roman",serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
}
h1,h2,h3,h4{
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
  color:var(--navy-800);
  margin-top:0;
  font-weight:700;
}
a{color:var(--navy-700);text-decoration:none;}
a:hover{color:var(--gold-500);}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.visually-hidden{position:absolute;left:-9999px;}

/* ===== Skip link ===== */
.skip-link{
  position:absolute;left:-9999px;top:0;background:var(--gold-500);color:var(--navy-900);
  padding:10px 16px;z-index:1000;font-family:"Trebuchet MS",sans-serif;font-weight:700;
}
.skip-link:focus{left:8px;top:8px;}

/* ===== Top strip ===== */
.topstrip{
  background:var(--navy-900);
  color:#cfd9ea;
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
  font-size:0.78rem;
  letter-spacing:.03em;
}
.topstrip .container{display:flex;justify-content:space-between;align-items:center;padding:6px 24px;flex-wrap:wrap;gap:6px;}
.topstrip a{color:#cfd9ea;}
.topstrip a:hover{color:var(--gold-400);}

/* ===== Header ===== */
header.site-header{
  background:var(--surface);
  border-bottom:3px solid var(--gold-500);
  position:sticky;top:0;z-index:500;
  box-shadow:0 2px 10px rgba(0,0,0,0.05);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 24px;
  gap:18px;
}
.brand-cluster{display:flex;align-items:center;gap:14px;}
.brand-cluster img{height:58px;width:auto;}
.brand-text{font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;line-height:1.15;}
.brand-text .uni{font-size:0.78rem;font-weight:700;color:var(--navy-800);letter-spacing:.04em;}
.brand-text .school{font-size:0.68rem;color:var(--ink-soft);letter-spacing:.03em;}

.conf-mark{
  display:flex;flex-direction:row;align-items:center;gap:14px;
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
}
.conf-seal{height:72px;width:72px;flex-shrink:0;}
.conf-text{display:flex;flex-direction:column;align-items:flex-start;}
.conf-mark .wordmark{
  font-size:1.55rem;font-weight:800;letter-spacing:.06em;color:var(--navy-900);
}
.conf-mark .wordmark span{color:var(--gold-500);}
.conf-mark .tagline{font-size:0.7rem;color:var(--ink-soft);letter-spacing:.02em;margin-top:2px;}
.conf-mark .year-rule{height:3px;width:64px;background:var(--gold-500);margin-top:6px;}

.brand-cluster.brand-right{justify-content:flex-end;}
.brand-cluster.brand-right .brand-text{text-align:right;}

nav.mainnav{
  background:var(--navy-800);
}
nav.mainnav .container{display:flex;align-items:center;justify-content:space-between;padding:0 24px;}
nav.mainnav ul{
  display:flex;list-style:none;margin:0;padding:0;flex-wrap:wrap;
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
}
nav.mainnav li{border-right:1px solid rgba(255,255,255,0.08);}
nav.mainnav a{
  display:block;padding:13px 14px;color:#eef2f8;font-size:0.8rem;font-weight:600;letter-spacing:.02em;
}
nav.mainnav a:hover,nav.mainnav a.active{background:var(--navy-700);color:var(--gold-400);}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.6rem;padding:8px 14px;cursor:pointer;}

/* ===== Hero ===== */
.hero{
  background:linear-gradient(135deg,var(--navy-900) 0%,var(--navy-700) 60%,var(--navy-600) 100%);
  color:#f3f6fb;
  padding:64px 0 56px;
  position:relative;
  overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-80px;top:-80px;width:360px;height:360px;
  border:2px solid rgba(218,185,74,0.18);border-radius:50%;
}
.hero .container{position:relative;z-index:2;}
.hero .eyebrow{
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
  text-transform:uppercase;letter-spacing:.18em;font-size:0.78rem;color:var(--gold-400);font-weight:700;
}
.hero h1{
  color:#fff;font-size:2.4rem;margin:10px 0 6px;line-height:1.18;
}
.hero h1 .acronym{color:var(--gold-400);}
.hero .theme-line{font-style:italic;font-size:1.12rem;color:#d8e2f1;max-width:760px;margin:6px 0 22px;}
.hero .meta-row{display:flex;flex-wrap:wrap;gap:28px;margin-top:8px;}
.hero .meta-item{font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;}
.hero .meta-item .label{display:block;font-size:0.72rem;letter-spacing:.08em;text-transform:uppercase;color:#9fb4d6;}
.hero .meta-item .value{font-size:1.02rem;font-weight:700;color:#fff;}
.hero .cta-row{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap;}

.hero-layout{display:flex;align-items:center;gap:48px;}
.hero-text{flex:1;min-width:0;}
.hero-emblem{flex-shrink:0;display:flex;align-items:center;justify-content:center;padding-right:20px;}
.hero-emblem img{width:220px;height:220px;filter:drop-shadow(0 0 28px rgba(201,162,39,0.4)) brightness(1.05);}

.btn{
  display:inline-block;font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;
  font-weight:700;font-size:0.88rem;letter-spacing:.03em;padding:13px 26px;border-radius:4px;
  border:2px solid transparent;cursor:pointer;
}
.btn-gold{background:var(--gold-500);color:var(--navy-900);}
.btn-gold:hover{background:var(--gold-400);}
.btn-outline{border-color:rgba(255,255,255,0.55);color:#fff;background:transparent;}
.btn-outline:hover{border-color:var(--gold-400);color:var(--gold-400);}
.btn-navy{background:var(--navy-800);color:#fff;}
.btn-navy:hover{background:var(--navy-700);}

/* ===== Sections ===== */
section{padding:54px 0;}
section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{margin-bottom:30px;max-width:760px;}
.section-head .kicker{
  font-family:"Trebuchet MS","Segoe UI",Arial,sans-serif;text-transform:uppercase;letter-spacing:.14em;
  font-size:0.74rem;color:var(--navy-600);font-weight:700;
}
.section-head h2{font-size:1.7rem;margin:6px 0 8px;}
.section-head p{color:var(--ink-soft);margin:0;}

/* ===== Cards / Grids ===== */
.grid{display:grid;gap:22px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:980px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.grid-3,.grid-2,.grid-4{grid-template-columns:1fr;}}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
}
.track-card{border-top:4px solid var(--navy-700);}
.track-card.t1{border-top-color:#8a1f2b;}
.track-card.t2{border-top-color:var(--navy-700);}
.track-card.t3{border-top-color:#1f7a52;}
.track-card h3{font-size:1.18rem;margin-bottom:4px;}
.track-card .track-no{
  font-family:"Trebuchet MS",sans-serif;font-size:0.72rem;letter-spacing:.12em;color:var(--ink-soft);
  text-transform:uppercase;
}
.track-card ul{margin:14px 0 0;padding-left:18px;color:var(--ink-soft);font-size:0.93rem;}
.track-card ul li{margin-bottom:6px;}

/* Dates timeline */
.timeline{border-left:3px solid var(--line);margin-left:8px;padding-left:0;}
.timeline-item{position:relative;padding:0 0 26px 30px;border-left:3px solid var(--line);margin-left:0;}
.timeline-item:last-child{border-color:transparent;padding-bottom:0;}
.timeline-item::before{
  content:"";position:absolute;left:-9px;top:2px;width:16px;height:16px;border-radius:50%;
  background:var(--gold-500);border:3px solid var(--surface);box-shadow:0 0 0 2px var(--navy-700);
}
.timeline-item .t-date{
  font-family:"Trebuchet MS",sans-serif;font-weight:700;color:var(--navy-800);font-size:0.92rem;
}
.timeline-item .t-label{color:var(--ink-soft);font-size:0.92rem;margin-top:2px;}

/* Committee */
.committee-block{margin-bottom:42px;}
.committee-block h3{
  font-size:1.25rem;border-bottom:2px solid var(--gold-500);padding-bottom:8px;margin-bottom:18px;
}
table.committee-table{width:100%;border-collapse:collapse;font-size:0.92rem;background:var(--surface);}
table.committee-table th,table.committee-table td{
  text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);
}
table.committee-table th{
  background:var(--navy-800);color:#fff;font-family:"Trebuchet MS",sans-serif;font-size:0.8rem;
  letter-spacing:.03em;text-transform:uppercase;
}
table.committee-table tr:nth-child(even) td{background:#fafbfd;}
.role-tag{
  display:inline-block;font-family:"Trebuchet MS",sans-serif;font-size:0.68rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase;background:var(--gold-500);color:var(--navy-900);
  padding:2px 8px;border-radius:3px;margin-left:8px;
}

/* Notice / callout boxes */
.notice{
  border:1px solid var(--line);border-left:4px solid var(--navy-700);background:#eef3fa;
  padding:16px 20px;border-radius:6px;font-size:0.92rem;color:var(--ink-soft);margin:20px 0;
}
.notice.gold{border-left-color:var(--gold-500);background:#fdf8ea;}
.notice strong{color:var(--navy-900);}

/* Fee table */
table.fee-table{width:100%;border-collapse:collapse;background:var(--surface);box-shadow:var(--shadow);}
table.fee-table th,table.fee-table td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;}
table.fee-table th{background:var(--navy-800);color:#fff;font-family:"Trebuchet MS",sans-serif;font-size:0.82rem;}
table.fee-table td.amount{font-weight:700;color:var(--navy-800);font-family:"Trebuchet MS",sans-serif;}
table.fee-table td.amount.early{color:#1f7a52;}

.earlybird-flag{
  display:inline-block;background:#1f7a52;color:#fff;font-family:"Trebuchet MS",sans-serif;
  font-size:0.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  padding:3px 9px;border-radius:3px;margin-left:8px;
}

/* Sponsorship tiers */
.tier-card{border-top:4px solid var(--line);position:relative;}
.tier-card.tier-diamond{border-top-color:var(--navy-900);border-top-width:6px;}
.tier-card.tier-platinum{border-top-color:#5b6b7d;}
.tier-card.tier-gold{border-top-color:var(--gold-500);}
.tier-card.tier-silver{border-top-color:#9aa6b3;}
.tier-card.tier-bronze{border-top-color:#9a6b3a;}
.tier-featured{background:linear-gradient(135deg,#fdf8ea 0%,#ffffff 60%);border-color:var(--gold-500);}
.tier-featured .tier-name{color:var(--navy-900);font-size:0.88rem;}
.tier-featured .tier-price{font-size:1.7rem;}
.tier-card .tier-name{
  font-family:"Trebuchet MS",sans-serif;font-size:0.78rem;text-transform:uppercase;letter-spacing:.1em;
  font-weight:700;color:var(--ink-soft);
}
.tier-card .tier-price{
  font-family:"Trebuchet MS",sans-serif;font-size:1.5rem;font-weight:800;color:var(--navy-900);margin:6px 0 14px;
}
.tier-card .tier-price small{font-size:0.85rem;font-weight:600;color:var(--ink-soft);}
.tier-card ul{margin:0;padding-left:18px;color:var(--ink-soft);font-size:0.9rem;}
.tier-card ul li{margin-bottom:7px;}

/* Nearby places */
.place-card .distance-tag{
  display:inline-block;font-family:"Trebuchet MS",sans-serif;font-size:0.72rem;font-weight:700;
  color:var(--navy-700);background:#eef3fa;padding:3px 9px;border-radius:3px;margin-bottom:10px;
}

/* Keynote placeholder */
.keynote-placeholder{
  text-align:center;padding:50px 24px;background:var(--surface);border:1px dashed var(--line);
  border-radius:var(--radius);color:var(--ink-soft);
}
.keynote-placeholder h3{margin-bottom:8px;}

/* Scroll to top button */
.scroll-top{
  position:fixed;right:22px;bottom:24px;width:46px;height:46px;border-radius:50%;
  background:var(--navy-800);color:#fff;border:none;cursor:pointer;font-size:1.3rem;
  display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px rgba(0,0,0,0.25);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .25s ease,visibility .25s ease,transform .25s ease,background .2s ease;
  z-index:600;
}
.scroll-top.visible{opacity:1;visibility:visible;transform:translateY(0);}
.scroll-top:hover{background:var(--gold-500);color:var(--navy-900);}

/* Stats strip */
.stats-strip{background:var(--navy-800);color:#fff;padding:34px 0;}
.stats-strip .grid-4{text-align:center;}
.stats-strip .stat-num{font-family:"Trebuchet MS",sans-serif;font-size:2rem;font-weight:800;color:var(--gold-400);}
.stats-strip .stat-label{font-size:0.82rem;letter-spacing:.04em;color:#cfd9ea;text-transform:uppercase;margin-top:4px;}

/* Footer */
footer.site-footer{background:var(--navy-900);color:#c4d0e4;padding:46px 0 22px;font-size:0.9rem;}
footer.site-footer .grid-4{margin-bottom:30px;}
footer.site-footer h4{color:#fff;font-size:0.95rem;margin-bottom:12px;}
footer.site-footer ul{list-style:none;padding:0;margin:0;}
footer.site-footer ul li{margin-bottom:8px;}
footer.site-footer a{color:#c4d0e4;}
footer.site-footer a:hover{color:var(--gold-400);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.12);margin-top:10px;padding-top:18px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:0.78rem;color:#7f93b8;
}

/* Breadcrumb / page header for subpages */
.page-hero{
  background:linear-gradient(135deg,var(--navy-900),var(--navy-700));
  color:#fff;padding:40px 0;
}
.page-hero .kicker{color:var(--gold-400);font-family:"Trebuchet MS",sans-serif;text-transform:uppercase;
  letter-spacing:.14em;font-size:0.76rem;font-weight:700;}
.page-hero h1{color:#fff;font-size:2rem;margin:6px 0 0;}

/* Phase note badge */
.phase-badge{
  display:inline-flex;align-items:center;gap:8px;background:#fdf8ea;border:1px solid var(--gold-500);
  color:var(--navy-900);font-family:"Trebuchet MS",sans-serif;font-size:0.82rem;font-weight:600;
  padding:8px 14px;border-radius:6px;
}

@media (max-width:860px){
  .header-inner{flex-wrap:wrap;row-gap:12px;}
  .conf-mark{align-items:flex-start;order:-1;width:100%;}
  .brand-cluster.brand-right{width:100%;justify-content:flex-start;}
  .brand-cluster.brand-right .brand-text{text-align:left;}
  nav.mainnav .container{flex-wrap:wrap;}
  nav.mainnav ul{display:none;flex-direction:column;width:100%;}
  nav.mainnav ul.open{display:flex;}
  nav.mainnav li{border-right:none;border-bottom:1px solid rgba(255,255,255,0.08);}
  .nav-toggle{display:block;}
  .hero h1{font-size:1.8rem;}
  .hero{padding:46px 0 40px;}
  .hero-emblem{display:none;}
  .scroll-top{right:16px;bottom:16px;width:42px;height:42px;}
}

@media (max-width:480px){
  .brand-cluster img{height:42px;}
  .brand-text .uni{font-size:0.68rem;}
  .brand-text .school{font-size:0.6rem;}
  .conf-mark .wordmark{font-size:1.25rem;}
  .hero h1{font-size:1.45rem;}
  .hero .meta-row{gap:16px;}
  table.committee-table,table.fee-table{font-size:0.82rem;}
}