/* ===========================================================
   ICAIGC 2027 — Shared Conference Stylesheet
   IEEE blue design system, matches index.html aesthetic.
   Mobile-responsive: desktop dropdown nav + mobile slide-in menu.
   =========================================================== */

:root{
  --primary:#0b3d91;
  --secondary:#1e6bd6;
  --bg:#f4f7fb;
  --card:#ffffff;
  --text:#1c1c1c;
  --soft:#eef3fb;
  --muted:#5b6776;
  --border:#e3e9f2;
  --shadow:0 4px 14px rgba(11,61,145,.07);
}

*{box-sizing:border-box;}

body{
  margin:0;
  font-family:"Segoe UI",Arial,"Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
}

a{color:var(--secondary);text-decoration:none;transition:color .2s;}
a:hover{color:var(--primary);}

img{max-width:100%;}

/* ---------- container ---------- */
.container{width:92%;max-width:1180px;margin:0 auto;}

/* ---------- top bar ---------- */
.topbar{
  background:var(--primary);
  color:#fff;
  font-size:13px;
  padding:7px 0;
}
.topbar .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
}
.topbar .tb-right{opacity:.85;}

/* ---------- header ---------- */
.site-header{
  background:#fff;
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:1000;
  box-shadow:0 2px 10px rgba(0,0,0,.05);
}
.header-flex{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 0;
}
.logo{
  font-size:24px;
  font-weight:800;
  color:var(--primary);
  letter-spacing:.5px;
}
.logo span{color:var(--secondary);}

/* ---------- desktop nav ---------- */
.desktop-nav{display:none;}

@media(min-width:992px){
  .desktop-nav{display:block;}
  .main-menu{
    display:flex;
    list-style:none;
    gap:2px;
    margin:0;
    padding:0;
  }
  .main-menu>li{position:relative;}
  .main-menu>li>a{
    display:block;
    padding:10px 14px;
    color:var(--text);
    font-weight:600;
    font-size:14px;
    border-radius:6px;
  }
  .main-menu>li>a:hover,
  .main-menu>li:hover>a{
    color:#fff;
    background:var(--primary);
  }
  .main-menu>li.active>a{color:var(--primary);}
  .sub-menu{
    position:absolute;
    top:100%;
    left:0;
    min-width:215px;
    background:#fff;
    box-shadow:0 10px 28px rgba(0,0,0,.13);
    border-radius:0 0 10px 10px;
    list-style:none;
    padding:6px 0;
    margin:0;
    opacity:0;
    visibility:hidden;
    transform:translateY(6px);
    transition:.2s ease;
  }
  .main-menu>li:hover .sub-menu{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .sub-menu li a{
    display:block;
    padding:9px 18px;
    color:var(--text);
    font-size:14px;
    font-weight:500;
  }
  .sub-menu li a:hover{
    background:var(--soft);
    color:var(--primary);
  }
}

/* ---------- hamburger toggle (mobile) ---------- */
.menu-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  border:none;
  background:var(--primary);
  color:#fff;
  border-radius:8px;
  font-size:22px;
  cursor:pointer;
  line-height:1;
}
@media(min-width:992px){.menu-toggle{display:none;}}

/* ---------- mobile slide-in nav ---------- */
.mobile-nav{
  position:fixed;
  top:0;
  right:-100%;
  width:84%;
  max-width:360px;
  height:100vh;
  background:var(--primary);
  overflow-y:auto;
  transition:right .3s ease;
  z-index:1100;
  padding:64px 22px 30px;
}
.mobile-nav.open{right:0;}
.mobile-nav>ul{list-style:none;margin:0;padding:0;}
.mobile-nav>ul>li{border-bottom:1px solid rgba(255,255,255,.12);}
.mobile-nav>ul>li>a{
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:#fff;
  padding:14px 4px;
  font-weight:600;
  font-size:15px;
}
.mobile-nav .sub-menu{
  list-style:none;
  margin:0;
  padding:0 0 10px 14px;
  display:none;
}
.mobile-nav .sub-menu.open{display:block;}
.mobile-nav .sub-menu li a{
  color:rgba(255,255,255,.85);
  padding:9px 0;
  display:block;
  font-weight:500;
  font-size:14px;
}
.mobile-nav .sub-menu li a:hover{color:#fff;}
.submenu-toggle{
  color:#fff;
  padding:14px 6px;
  cursor:pointer;
  font-size:11px;
  user-select:none;
}
.close-menu{
  position:absolute;
  top:16px;
  right:18px;
  background:none;
  border:none;
  color:#fff;
  font-size:28px;
  cursor:pointer;
  line-height:1;
}
.overlay{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.45);
  z-index:1050;
  opacity:0;
  visibility:hidden;
  transition:.3s;
}
.overlay.open{opacity:1;visibility:visible;}

/* ---------- page hero banner ---------- */
.page-hero{
  background:linear-gradient(120deg,rgba(11,61,145,.93),rgba(30,107,214,.82));
  color:#fff;
  padding:56px 0;
  text-align:center;
}
.page-hero h1{
  font-size:34px;
  margin:0 0 10px;
  letter-spacing:.5px;
}
.page-hero p{
  opacity:.92;
  margin:0;
  font-size:16px;
}
.breadcrumb{
  font-size:13px;
  opacity:.85;
  margin-bottom:12px;
}
.breadcrumb a{color:#fff;}

/* ---------- sections ---------- */
.section{padding:56px 0;}
.section.alt{background:var(--soft);}
.section-title{
  text-align:center;
  font-size:26px;
  margin:0 0 32px;
  color:var(--primary);
}
.section-title::after{
  content:"";
  display:block;
  width:60px;
  height:3px;
  background:var(--secondary);
  margin:12px auto 0;
  border-radius:3px;
}
.lead{
  max-width:860px;
  margin:0 auto 30px;
  text-align:center;
  color:var(--muted);
  font-size:16px;
}

/* ---------- grid + cards ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:20px;
}
.card{
  background:var(--card);
  padding:22px;
  border-radius:12px;
  box-shadow:var(--shadow);
  border:1px solid var(--border);
}
.card h3{color:var(--primary);margin:0 0 8px;font-size:19px;}
.card p{margin:0;color:var(--muted);}
.card:hover{
  transform:translateY(-4px);
  box-shadow:0 12px 26px rgba(11,61,145,.13);
  transition:.25s ease;
}

/* ---------- CFP block ---------- */
.cfp{
  background:var(--soft);
  padding:28px;
  border-radius:12px;
  line-height:1.85;
}
.cfp ul{
  columns:2;
  column-gap:34px;
  padding-left:20px;
  margin:14px 0 0;
}
.cfp li{margin-bottom:8px;break-inside:avoid;}

/* ---------- timeline ---------- */
.timeline{
  border-left:3px solid var(--secondary);
  padding-left:22px;
  max-width:840px;
  margin:0 auto;
}
.timeline-item{
  margin-bottom:16px;
  background:#fff;
  border:1px solid var(--border);
  border-radius:10px;
  padding:14px 18px;
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.timeline-item b{color:var(--primary);}
.timeline-item .date{font-weight:700;color:var(--secondary);}

/* ---------- committee ---------- */
.committee-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:16px;
}
.member{
  background:#fff;
  padding:18px;
  border-radius:12px;
  text-align:center;
  box-shadow:0 3px 10px rgba(0,0,0,.05);
  border:1px solid var(--border);
}
.member .role{
  color:var(--secondary);
  font-size:12px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.5px;
}
.member .name{font-size:17px;font-weight:700;margin-top:6px;color:var(--primary);}
.member .aff{color:var(--muted);font-size:13px;margin-top:4px;}


/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;border-radius:12px;box-shadow:var(--shadow);}
table.data{
  width:100%;
  border-collapse:collapse;
  background:#fff;
  min-width:560px;
}
table.data th,table.data td{
  padding:14px 16px;
  text-align:left;
  border-bottom:1px solid var(--border);
  font-size:15px;
}
table.data thead th{background:var(--primary);color:#fff;font-weight:600;}
table.data tbody tr:nth-child(even){background:var(--soft);}
table.data tbody tr:hover{background:#e6eefb;}
table.data .price{font-weight:700;color:var(--primary);white-space:nowrap;}

/* ---------- info / note boxes ---------- */
.note{
  background:#fff;
  border-left:4px solid var(--secondary);
  padding:16px 18px;
  border-radius:8px;
  box-shadow:0 2px 8px rgba(0,0,0,.05);
  margin:18px 0;
}
.note.blue{border-color:var(--primary);}
.note b{color:var(--primary);}
.note ul{margin:8px 0 0;padding-left:20px;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:var(--primary);
  color:#fff !important;
  padding:12px 24px;
  border-radius:30px;
  font-weight:600;
  transition:.25s;
  box-shadow:0 4px 12px rgba(11,61,145,.25);
}
.btn:hover{background:var(--secondary);transform:translateY(-2px);}
.btn svg{width:18px;height:18px;}

/* ---------- two-column text ---------- */
.two-col{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:24px;
}
.two-col h3{color:var(--primary);margin-top:0;}

/* ---------- footer ---------- */
footer{
  background:#0a2a55;
  color:#fff;
  padding:30px 0;
  text-align:center;
  font-size:14px;
  margin-top:30px;
}
footer .container{display:flex;flex-direction:column;gap:6px;}
footer a{color:#9ec1ff;}

/* ---------- quick links ---------- */
.quick-links{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px;
}
.ql-item{
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 18px;
  border-radius:12px;
  background:#fff;
  border:1px solid var(--border);
  color:var(--text);
  text-decoration:none;
  transition:.2s;
}
.ql-item:hover{border-color:var(--secondary);box-shadow:var(--shadow);color:var(--primary);}
.ql-item .ql-ic{
  flex:0 0 auto;
  width:42px;height:42px;
  border-radius:10px;
  background:var(--soft);
  color:var(--primary);
  display:flex;align-items:center;justify-content:center;
}
.ql-item .ql-ic svg{width:22px;height:22px;}
.ql-item .ql-txt b{display:block;font-size:15px;}
.ql-item .ql-txt span{font-size:13px;color:var(--muted);}

/* ---------- CFP icon row ---------- */
.cfp-icons{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin:18px 0 10px;}
.cfp-icons a{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:30px;
  background:#fff;border:1px solid var(--border);
  color:var(--primary);font-weight:600;font-size:14px;transition:.2s;
}
.cfp-icons a:hover{background:var(--primary);color:#fff;border-color:var(--primary);}
.cfp-icons a svg{width:18px;height:18px;}

/* ---------- icon text / feature list (less boxy) ---------- */
.feature-list{list-style:none;margin:0;padding:0;}
.feature-list>li{
  display:flex;gap:14px;align-items:flex-start;
  padding:14px 0;border-bottom:1px solid var(--border);
}
.feature-list>li:last-child{border-bottom:none;}
.feature-list .ic{
  flex:0 0 38px;width:38px;height:38px;border-radius:50%;
  background:var(--soft);color:var(--primary);
  display:flex;align-items:center;justify-content:center;
}
.feature-list .ic svg{width:20px;height:20px;}
.feature-list .txt{flex:1;}
.feature-list .txt h4{margin:0 0 4px;color:var(--primary);font-size:16px;}
.feature-list .txt p{margin:0;color:var(--muted);font-size:15px;line-height:1.7;}

/* ---------- news list ---------- */
.news-list{list-style:none;margin:0;padding:0;}
.news-list li{padding:20px 0;border-bottom:1px solid var(--border);}
.news-list li:last-child{border-bottom:none;}
.news-list .date{
  display:inline-block;font-size:13px;font-weight:700;color:#fff;
  background:var(--secondary);padding:3px 12px;border-radius:20px;margin-bottom:10px;
}
.news-list h4{margin:0 0 6px;color:var(--primary);font-size:18px;}
.news-list p{margin:0;color:var(--muted);line-height:1.7;}

/* ---------- single speaker framework ---------- */
.speaker-single{
  max-width:520px;margin:0 auto;text-align:center;
  padding:34px;background:#fff;border:1px solid var(--border);
  border-radius:14px;box-shadow:var(--shadow);
}
.speaker-single .avatar{
  width:110px;height:110px;border-radius:50%;
  background:var(--soft);color:var(--primary);
  display:flex;align-items:center;justify-content:center;
  font-size:42px;margin:0 auto 18px;
}
.speaker-single h3{margin:0 0 6px;color:var(--primary);}
.speaker-single .aff{color:var(--muted);margin-bottom:12px;}

/* ---------- registration page helpers ---------- */
.reg-sub{font-size:15px;color:var(--muted);margin:0 0 18px;line-height:1.7;}
.reg-steps{list-style:none;margin:0;padding:0;counter-reset:step;}
.reg-steps>li{
  position:relative;padding:0 0 20px 56px;counter-increment:step;
  border-left:2px solid var(--border);margin-left:18px;
}
.reg-steps>li:last-child{border-left-color:transparent;padding-bottom:0;}
.reg-steps>li::before{
  content:counter(step);position:absolute;left:-19px;top:0;
  width:38px;height:38px;border-radius:50%;
  background:var(--primary);color:#fff;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.reg-steps>li h4{margin:6px 0 4px;color:var(--primary);font-size:16px;}
.reg-steps>li p{margin:0;color:var(--muted);font-size:15px;line-height:1.7;}
.incl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px;margin-top:8px;}
.incl-grid h3{color:var(--primary);margin:0 0 4px;font-size:17px;}
.incl-grid ul{list-style:none;margin:0;padding:0;}
.incl-grid ul li{display:flex;gap:10px;align-items:flex-start;padding:9px 0;border-bottom:1px dashed var(--border);font-size:15px;color:var(--text);}
.incl-grid ul li:last-child{border-bottom:none;}
.incl-grid ul li svg{flex:0 0 18px;width:18px;height:18px;margin-top:3px;color:var(--secondary);}
.reg-note{
  background:var(--soft);border-left:4px solid var(--secondary);
  padding:14px 18px;border-radius:0 8px 8px 0;font-size:15px;color:var(--text);line-height:1.7;
}
.reg-note b{color:var(--primary);}

/* ---------- track list (light, no boxes) ---------- */
.track-list{list-style:none;margin:0;padding:0;counter-reset:tk;}
.track-list>li{
  display:flex;gap:16px;align-items:flex-start;
  padding:15px 0;border-bottom:1px solid var(--border);
}
.track-list>li:last-child{border-bottom:none;}
.track-list .num{
  flex:0 0 40px;width:40px;height:40px;border-radius:10px;
  background:var(--soft);color:var(--primary);
  font-weight:700;font-size:15px;
  display:flex;align-items:center;justify-content:center;
}
.track-list .t-txt{flex:1;}
.track-list .t-txt h4{margin:0 0 4px;color:var(--primary);font-size:16px;}
.track-list .t-txt p{margin:0;color:var(--muted);font-size:15px;line-height:1.7;}

/* ---------- program schedule (vertical) ---------- */
.prog-schedule{margin-top:6px;}
.prog-day{margin:0 0 34px;}
.prog-day:last-child{margin-bottom:0;}
.prog-day-h{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin:0 0 12px;padding-bottom:10px;border-bottom:2px solid var(--primary);}
.prog-day-h .d{font-size:21px;font-weight:800;color:var(--primary);}
.prog-day-h .dt{font-size:15px;color:var(--muted);}
.prog-list{list-style:none;margin:0;padding:0;}
.prog-row{display:flex;gap:18px;padding:14px 0;border-bottom:1px solid var(--border);align-items:flex-start;}
.prog-time{flex:0 0 150px;font-weight:700;color:var(--secondary);font-size:15px;font-variant-numeric:tabular-nums;}
.prog-ev{flex:1;}
.prog-ev b{display:block;font-size:16px;color:#1a2533;margin-bottom:2px;font-weight:700;}
.prog-ev span{color:var(--muted);font-size:14px;}
@media(max-width:600px){
  .prog-row{flex-direction:column;gap:4px;}
  .prog-time{flex-basis:auto;}
}

/* ---------- travel: attraction blocks ---------- */
.attraction{display:flex;gap:24px;padding:26px 0;border-bottom:1px solid var(--border);align-items:flex-start;}
.attraction:last-child{border-bottom:0;}
.attraction-img{flex:0 0 300px;height:200px;border-radius:10px;overflow:hidden;background:var(--soft);}
.attraction-img img{width:100%;height:100%;object-fit:cover;display:block;}
.attraction-body{flex:1;min-width:0;}
.attraction-body h3{margin:0 0 6px;font-size:21px;color:var(--primary);display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.attraction-body .rating{color:#f59e0b;font-size:15px;letter-spacing:1.5px;}
.attraction-loc{margin:0 0 10px;color:var(--muted);font-size:14px;}
.attraction-body p{margin:0 0 8px;color:#374151;line-height:1.7;}

/* ---------- flat content (no-card pages) ---------- */
.flat h3{color:var(--primary);margin:26px 0 10px;font-size:19px;}
.flat ul{margin:0 0 8px;padding-left:22px;list-style:disc;}
.flat ul li{margin:6px 0;line-height:1.75;}
.flat p{line-height:1.8;}

/* ---------- responsive tweaks ---------- */
@media(max-width:768px){
  .page-hero{padding:42px 0;}
  .page-hero h1{font-size:25px;}
  .section{padding:40px 0;}
  .section-title{font-size:22px;}
  .cfp ul{columns:1;}
  .grid,.committee-grid{grid-template-columns:1fr;}
  .attraction{flex-direction:column;}
  .attraction-img{flex:0 0 auto;width:100%;height:220px;}
}
@media(max-width:480px){
}