:root{
  --ink:#04101c; --navy:#071b2e; --deep:#0b2a44; --line:rgba(255,255,255,.12);
  --cyan:#22d3ee; --cyan-d:#0891b2; --gold:#f5c451; --text:#dbe7f3; --muted:#8ea6bd;
  --paper:#f4f8fb; --card:#ffffff; --dark-text:#0b2a44;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{font-family:Inter,system-ui,sans-serif;font-size:16.5px;-webkit-font-smoothing:antialiased;background:var(--paper);color:var(--dark-text);line-height:1.6}
h1,h2,h3,h4{font-family:Sora,sans-serif;line-height:1.2;letter-spacing:-.02em;text-wrap:balance}
p{text-wrap:pretty}
a{color:inherit;text-decoration:none}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
.wrap{width:min(1120px,92%);margin-inline:auto}

/* nav */
.progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:70;background:linear-gradient(90deg,var(--cyan),var(--gold))}
#nav{position:fixed;top:19px;left:50%;transform:translateX(-50%);z-index:60;width:min(1180px,94%);display:flex;align-items:center;justify-content:space-between;padding:.5rem .55rem .5rem 1rem;border-radius:999px;background:rgba(7,27,46,.45);backdrop-filter:blur(16px) saturate(170%);-webkit-backdrop-filter:blur(16px) saturate(170%);border:1px solid var(--line);transition:background .3s,box-shadow .3s,top .3s}
#nav.scrolled{background:rgba(4,16,28,.85);box-shadow:0 12px 40px rgba(0,0,0,.35);top:8px}
.logo{display:flex;align-items:center;gap:.6rem;font-family:Sora;font-weight:800;color:#fff;font-size:1.15rem}
.logo .mk{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--cyan),#3b82f6);color:var(--ink);font-size:.95rem}
.logo em{font-style:normal;color:var(--cyan); margin-left: -8px;}
.links{display:flex;flex-wrap:wrap;gap:.15rem;list-style:none}
.links a{display:block;color:var(--text);font-size:.85rem;font-weight:500;padding:.5rem .7rem;border-radius:999px;transition:background .2s,color .2s;white-space:nowrap}
.links a:hover{color:#fff;background:rgba(255,255,255,.1)}
.links a.active{color:var(--ink);background:var(--cyan);font-weight:600}
.navr{display:flex;align-items:center;gap:.5rem}
.navr .btn{padding:.6rem 1.1rem;font-size:.88rem;border-radius:999px}
.burger{display:none;width:42px;height:42px;place-items:center;background:rgba(255,255,255,.08);border:1px solid var(--line);border-radius:50%;color:#fff;font-size:1.1rem;cursor:pointer;flex-shrink:0}
@media(max-width:1150px){
  .burger{display:grid}
  .navr .btn{display:none}
  .links{position:absolute;top:calc(100% + 10px);left:0;right:0;flex-direction:column;gap:.15rem;background:rgba(4,16,28,.95);backdrop-filter:blur(16px);border:1px solid var(--line);border-radius:22px;padding:.6rem;display:none}
  .links.open{display:flex}
  .links a{padding:.8rem 1rem;border-radius:14px}
}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.95rem;padding:.8rem 1.4rem;border-radius:10px;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-3px)}
.btn-cyan{background:var(--cyan);color:var(--ink)}
.btn-cyan:hover{box-shadow:0 8px 24px rgba(34,211,238,.45)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border-color:var(--line)}
.btn-ghost:hover{background:rgba(255,255,255,.12);box-shadow:0 8px 24px rgba(0,0,0,.3)}

/* hero */
.shell{background:var(--ink);padding:2.5vh 0}
.hero{position:relative;width:95%;height:95vh;min-height:680px;margin:0 auto;border-radius:32px;overflow:hidden;color:#fff;display:grid;place-items:center;text-align:center;
  background:radial-gradient(ellipse at 50% 20%,#0f4a72,var(--navy) 60%,var(--ink));box-shadow:0 30px 80px rgba(0,0,0,.45)}
.hero .bg{position:absolute;inset:0;width:100%;height:100%;   object-fit:cover;animation:zoom 22s ease-out both}
.hero::before{content:"";position:absolute;inset:0;z-index:1;
  background:radial-gradient(ellipse at 50% 50%,rgba(4,16,28,.55),transparent 72%),linear-gradient(180deg,rgba(4,16,28,.66) 0%,rgba(7,27,46,.72) 50%,rgba(4,16,28,.95) 100%)}
.hero::after{content:"";position:absolute;inset:0;z-index:1;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:48px 48px;opacity:.18;mask-image:radial-gradient(circle at 50% 50%,#000,transparent 75%);-webkit-mask-image:radial-gradient(circle at 50% 50%,#000,transparent 75%)}
.rings{position:absolute;z-index:1;left:50%;top:50%;width:0;height:0}
.rings i{position:absolute;border:1.5px solid var(--cyan);border-radius:50%;transform:translate(-50%,-50%);opacity:0;animation:ping 6s ease-out infinite}
.rings i:nth-child(2){animation-delay:2s}.rings i:nth-child(3){animation-delay:4s}
.hero .wrap{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;padding-top:3.5rem;text-shadow:0 2px 24px rgba(0,0,0,.55)}
.hero .wrap>*{animation:up .8s backwards}
.hero .wrap>:nth-child(2){animation-delay:.1s}.hero .wrap>:nth-child(3){animation-delay:.2s}.hero .wrap>:nth-child(4){animation-delay:.3s}.hero .wrap>:nth-child(5){animation-delay:.4s}.hero .wrap>:nth-child(6){animation-delay:.5s}.hero .wrap>:nth-child(7){animation-delay:.6s}
.tag{display:inline-flex;align-items:center;gap:.6rem;padding:.45rem 1rem;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(4,16,28,.45);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:.85rem;font-weight:500;color:#fff;text-shadow:none}
.tag i{width:8px;height:8px;border-radius:50%;background:#34d399;animation:pulse 2s infinite}
.hero h1{font-size:clamp(3.6rem,12vw,8rem);font-weight:800;letter-spacing:-.045em;line-height:.95;margin:1.3rem 0 1.1rem}
.hero h1 span{color:var(--cyan);text-shadow:0 0 44px rgba(34,211,238,.5)}
.hero h2{font-size:clamp(1.05rem,2.3vw,1.55rem);font-weight:500;color:#fff;max-width:800px;line-height:1.4;margin-bottom:.9rem}
.hero .org{color:#d3e3f0;max-width:640px;margin-bottom:1.5rem;font-size:1rem}
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:.7rem;margin-bottom:1.5rem}
.chip{background:rgba(4,16,28,.5);border:1px solid rgba(255,255,255,.22);border-radius:12px;padding:.55rem 1rem;font-size:.9rem;font-weight:500;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);text-shadow:none}
.chip i{color:var(--gold);margin-right:.5rem}
.count{display:flex;gap:.7rem;margin-bottom:1.8rem}
.count div{width:76px;padding:.7rem 0;background:rgba(4,16,28,.55);border:1px solid rgba(255,255,255,.2);border-radius:14px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.count b{display:block;font-family:Sora;font-size:1.7rem}
.count span{font-size:.72rem;color:#c3d5e4}
.hero .btns{display:flex;flex-wrap:wrap;justify-content:center;gap:.8rem}
.hero .btn{text-shadow:none}
.cue{position:absolute;z-index:2;bottom:22px;left:50%;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(255,255,255,.6);border-radius:14px}
.cue::after{content:"";position:absolute;left:50%;top:8px;width:4px;height:8px;margin-left:-2px;border-radius:2px;background:var(--cyan);animation:cue 1.6s infinite}
@keyframes cue{to{transform:translateY(14px);opacity:0}}
@keyframes zoom{from{transform:scale(1.08)}to{transform:scale(1)}}
@keyframes ping{0%{width:80px;height:80px;opacity:.6}100%{width:1200px;height:1200px;opacity:0}}
@keyframes up{from{opacity:0;transform:translateY(26px)}}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(52,211,153,.7)}100%{box-shadow:0 0 0 10px rgba(52,211,153,0)}}
.rv{opacity:0}
.rv.in{opacity:1;animation:up .7s backwards;animation-delay:var(--d,0s)}
@media(max-width:700px){
  .hero{height:auto;min-height:95vh;padding:6.5rem 0 4.5rem;border-radius:22px}
  .hero .wrap{padding-top:0}
  .hero .org,.cue{display:none}
  .count div{width:64px}
}

/* sections */
section{padding:4.5rem 0}
.dark{background:linear-gradient(160deg,var(--navy),var(--deep));color:var(--text)}
.dark h2,.dark h3{color:#fff}
.head{margin-bottom:2.2rem;max-width:1300px}
.head h2{font-size:clamp(1.9rem,4.4vw,2.75rem);font-weight:800;line-height:1.1;position:relative;padding-bottom:.8rem}
.head h2::after{content:"";position:absolute;left:0;bottom:0;width:56px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--cyan),var(--gold))}
.head p{margin-top:.7rem;color:#4a6378;font-size:1.05rem; width: 100%; text-align: justify;}
.dark .head p{color:var(--muted)}

/* flex-based layout grid (replaces CSS grid) */
.grid{display:flex;flex-wrap:wrap;gap:1.2rem}
.g4>*{flex:1 1 230px}
.g3>*{flex:1 1 280px}
.g2>*{flex:1 1 320px}
.g13>*{flex:1 1 210px;max-width:calc(25% - .9rem)}
@media(max-width:900px){.g13>*{max-width:calc(33.33% - .8rem)}}
@media(max-width:620px){.g13>*{max-width:calc(50% - .6rem)}}

.card{display:flex;flex-direction:column;background:var(--card);border:1px solid #e0eaf2;border-radius:16px;padding:1.6rem;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(8,145,178,.18);border-color:var(--cyan)}
.dark .card{background:rgba(255,255,255,.05);border-color:var(--line)}
.card h3{font-size:1.12rem;font-weight:700;margin-bottom:.4rem}
.card p{font-size:.92rem;color:#4a6378}
.dark .card p{color:var(--muted)}
.ico{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--cyan),var(--cyan-d));color:var(--ink);font-size:1.1rem;margin-bottom:.9rem;flex-shrink:0}
.dept .visit{margin-top:auto;padding-top:1rem;font-size:.85rem;font-weight:600;color:var(--cyan-d);display:flex;align-items:center;gap:.4rem}
.dept .visit i{font-size:.75rem;transition:transform .25s}
.dept:hover .visit i{transform:translateX(4px)}
.date{align-items:flex-start}
.date i{font-size:1.2rem;color:var(--cyan);margin-bottom:.7rem}
.date p{margin-bottom:.3rem;color:var(--muted);font-size:.88rem}
.date b{display:block;font-family:Sora;font-size:1.3rem;color:#fff}
.date.hot{border-color:var(--gold);background:linear-gradient(180deg,rgba(245,196,81,.14),rgba(255,255,255,.04))}
.date.hot i{color:var(--gold)}
.date.hot b{color:var(--gold)}
.note{margin-top:1.4rem;border-left:4px solid var(--gold);background:#fffaf0;padding:1rem 1.2rem;border-radius:0 12px 12px 0;font-size:.93rem;color:#4a6378}
.cta{margin-top:1.6rem;display:flex;flex-wrap:wrap;gap:.8rem}

/* call for papers: consistent-height topic cards */
.topic ul{list-style:none;font-size:.9rem;display:flex;flex-direction:column;gap:.55rem;flex:1}
.topic li{position:relative;padding-left:1.15rem;color:#4a6378}
.topic li::before{content:"";position:absolute;left:0;top:.5em;width:6px;height:6px;border-radius:50%;background:var(--cyan-d)}

table{width:100%;border-collapse:collapse;background:var(--card);border-radius:16px;overflow:hidden;font-size:.93rem}
th,td{padding:1rem 1.2rem;text-align:left;border-bottom:1px solid #e0eaf2}
th{background:var(--deep);color:#fff;font-family:Sora;font-weight:600}
tr:last-child td{border:0}
.tw{overflow-x:auto;border-radius:16px}

.spk{text-align:center;align-items:center}
.av{width:80px;height:80px;border-radius:50%;margin:0 auto .9rem;position:relative;overflow:hidden;font-size:1.7rem;color:var(--ink);background:conic-gradient(from 200deg,var(--cyan),var(--gold),var(--cyan));flex-shrink:0}
.av i{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
.av img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.spk h3{font-size:.98rem}
.spk p{font-size:.82rem}
.onl{font-size:.72rem;font-weight:500;color:var(--cyan-d)}
.grp{font-size:1.05rem;font-weight:700;color:var(--cyan-d);margin:2rem 0 1rem;padding-top:1.4rem;border-top:1px dashed #d7e3ee}
.grp:first-of-type{margin-top:0;padding-top:0;border-top:0}
.dark .grp{border-top-color:var(--line)}
.subhead{margin:3.2rem 0 2rem;padding-top:2.4rem;border-top:1px solid var(--line);text-align:center}
.subhead h3{font-family:Sora;font-weight:800;font-size:clamp(1.35rem,2.6vw,1.75rem);color:#fff;margin-bottom:.55rem;letter-spacing:-.01em}
.subhead p{color:var(--muted);font-size:.95rem;max-width:560px;margin:0 auto}
.card.spk{padding:2rem 1.3rem}
.card.spk .av{width:86px;height:86px;margin-bottom:1.1rem;font-size:1.9rem}
.card.spk h3{font-size:1.02rem;margin-bottom:.35rem}
.card.spk p{font-size:.86rem;line-height:1.45}

/* committee: person blocks inside each card, stacked with flex */
.person{padding:.9rem 0}
.person+.person{border-top:1px solid #e7eef4;margin-top:.2rem}
.dark .person+.person{border-top:1px solid var(--line)}
.person b{display:block;font-family:Sora;font-size:1rem;font-weight:700;margin-bottom:.25rem}
.person span{display:block;font-size:.85rem;color:var(--muted);line-height:1.5}

.day h3{color:var(--cyan-d);margin-bottom:.7rem}
.day ul{list-style:none;display:flex;flex-direction:column;gap:.5rem}
.day li{font-size:.93rem}
.day li i{color:var(--gold);margin-right:.5rem;width:14px}
.map{display:flex;align-items:center;justify-content:center;min-height:220px;background:repeating-linear-gradient(45deg,#0d3a5c,#0d3a5c 12px,#0b2f4c 12px,#0b2f4c 24px);border-radius:16px;color:#fff;text-align:center;padding:1rem}
.map iframe{border-radius:12px;display:block}

/* sponsors */
.sponsors{display:flex;flex-wrap:wrap;gap:1.1rem;margin-top:.6rem}
.slogo{flex:1 1 170px;max-width:200px;height:104px;background:var(--card);border:1px solid #e0eaf2;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.4rem;padding:.8rem;transition:transform .25s,box-shadow .25s,border-color .25s}
.slogo:hover{transform:translateY(-5px);box-shadow:0 12px 28px rgba(8,145,178,.16);border-color:var(--cyan)}
.slogo i{display:none;font-size:1.4rem;color:var(--cyan-d)}
.slogo img{max-width:100%;max-height:44px;object-fit:contain}
.slogo span{font-weight:700;font-size:.82rem;color:var(--dark-text);text-align:center;line-height:1.25}
.ack{margin-top:2rem;display:flex;gap:1rem;padding:1.2rem 1.3rem;background:#eef5fa;border-radius:14px;align-items:flex-start}
.ack i{color:var(--cyan-d);font-size:1.15rem;margin-top:.2rem;flex-shrink:0}
.ack b{display:block;font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--dark-text);margin-bottom:.4rem}
.ack p{font-size:.88rem;color:#4a6378}

footer{background:var(--ink);color:var(--muted);text-align:center;padding:2rem 0;font-size:.88rem}
footer a{color:var(--cyan)}

/* registration */
.tw td{color:var(--dark-text)}
.tw td b{font-family:Sora;display:block;margin-bottom:.25rem;font-size:1.02rem}
.tw .fine{font-size:.82rem;color:#5a7488}
.tw th small{display:block;font-weight:500;font-size:.72rem;opacity:.85;margin-top:.2rem}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}




/* =========================================================
   SIMPLE AUTH / REGISTRATION PAGE
========================================================= */

.auth-page{
  min-height:100vh;
  background:
    radial-gradient(circle at 50% 20%,#0f4a72 0%,var(--navy) 45%,var(--ink) 100%);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding:30px 18px;
  position:relative;
  overflow:hidden;
}

.auth-page::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:45px 45px;
  opacity:.12;
  mask-image:radial-gradient(circle,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(circle,#000,transparent 75%);
  pointer-events:none;
}

.auth-logo{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  gap:.55rem;
  color:#fff;
  font-family:Sora,sans-serif;
  font-size:1.2rem;
  font-weight:800;
  margin-bottom:18px;
  animation:authFade .6s ease both;
}

.auth-logo em{
  color:var(--cyan);
  font-style:normal;
}

.auth-logo img{
  width:32px;
  height:32px;
  object-fit:cover;
  border-radius:8px;
}

.auth-card{
  position:relative;
  z-index:2;
  width:min(500px,100%);
  padding:2rem;
  border-radius:22px;
  background:rgba(255,255,255,.97);
  border:1px solid rgba(255,255,255,.2);
  box-shadow:0 25px 70px rgba(0,0,0,.4);
  animation:authCardIn .65s ease both;
}

.auth-header{
  text-align:center;
  margin-bottom:1.5rem;
}

.auth-icon{
  width:48px;
  height:48px;
  margin:0 auto .8rem;
  display:grid;
  place-items:center;
  border-radius:14px;
  background:linear-gradient(135deg,var(--cyan),#38bdf8);
  color:var(--ink);
  box-shadow:0 8px 24px rgba(34,211,238,.25);
}

.auth-header h1{
  color:var(--dark-text);
  font-size:1.5rem;
  margin-bottom:.25rem;
}

.auth-header p{
  color:#718798;
  font-size:.82rem;
}

.auth-form{
  display:none;
  animation:authFormIn .3s ease both;
}

.auth-form.active{
  display:block;
}

.auth-field{
  margin-bottom:1rem;
}

.auth-field label{
  display:block;
  margin-bottom:.4rem;
  font-size:.78rem;
  font-weight:700;
  color:var(--dark-text);
}

.auth-input{
  position:relative;
}

.auth-input > i{
  position:absolute;
  left:1rem;
  top:50%;
  transform:translateY(-50%);
  color:#7891a3;
  pointer-events:none;
}

.auth-input input,
.auth-input select{
  width:100%;
  height:47px;
  border:1px solid #d8e3ea;
  border-radius:11px;
  outline:none;
  background:#fff;
  color:var(--dark-text);
  padding:0 2.7rem;
  transition:border-color .2s,box-shadow .2s;
}

.auth-input input:focus,
.auth-input select:focus{
  border-color:var(--cyan-d);
  box-shadow:0 0 0 4px rgba(34,211,238,.1);
}

.auth-input select{
  appearance:none;
  cursor:pointer;
}

.select-input::after{
  content:"\f078";
  position:absolute;
  right:1rem;
  top:50%;
  transform:translateY(-50%);
  font-family:"Font Awesome 6 Free";
  font-weight:900;
  font-size:.65rem;
  color:#7891a3;
  pointer-events:none;
}

.password-toggle{
  position:absolute;
  right:.65rem;
  top:50%;
  transform:translateY(-50%);
  width:30px;
  height:30px;
  background:none;
  color:#7891a3;
  cursor:pointer;
}

.password-toggle:hover{
  color:var(--cyan-d);
}

.auth-two{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:.8rem;
}

.auth-submit{
  width:100%;
  height:49px;
  margin-top:.35rem;
  border:0;
  border-radius:11px;
  background:linear-gradient(135deg,var(--cyan),#67e8f9);
  color:var(--ink);
  font-weight:700;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  transition:transform .2s,box-shadow .2s;
}

.auth-submit:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 25px rgba(34,211,238,.25);
}

.auth-switch{
  text-align:center;
  margin-top:1rem;
  color:#718798;
  font-size:.78rem;
}

.auth-switch button,
.forgot-row button{
  border:0;
  background:none;
  color:var(--cyan-d);
  font-weight:700;
  cursor:pointer;
}

.auth-switch button:hover,
.forgot-row button:hover{
  text-decoration:underline;
}

.forgot-row{
  text-align:right;
  margin:-.2rem 0 1rem;
}

.forgot-row button{
  font-size:.75rem;
}

.auth-info{
  display:flex;
  align-items:flex-start;
  gap:.6rem;
  margin-bottom:1rem;
  padding:.75rem;
  border-radius:10px;
  background:#eefbfe;
  color:#567487;
  font-size:.75rem;
  line-height:1.5;
}

.auth-info i{
  color:var(--cyan-d);
  margin-top:2px;
}

@keyframes authCardIn{
  from{
    opacity:0;
    transform:translateY(20px) scale(.98);
  }
  to{
    opacity:1;
    transform:none;
  }
}

@keyframes authFormIn{
  from{
    opacity:0;
    transform:translateY(8px);
  }
  to{
    opacity:1;
    transform:none;
  }
}

@keyframes authFade{
  from{
    opacity:0;
  }
  to{
    opacity:1;
  }
}

@media(max-width:560px){

  .auth-card{
    padding:1.4rem;
  }

  .auth-two{
    grid-template-columns:1fr;
    gap:0;
  }

}