/* =========================================================
   International Conference on Open Source Wireless Networks
   Visual language aligned with the OAI Foundation workshop page
   (Blocksy/Kubio): blue primary, navy headings, light-grey
   alternating sections, rounded white cards, soft shadows.
   ========================================================= */

:root {
  /* Brand palette */
  --blue:        #1559ed;
  --blue-600:    #0f47c4;
  --blue-bright: #2872fa;
  --blue-50:     #e7f0fe;
  --navy:        #192a3d;
  --ink:         #3a4f66;
  --muted:       #64748b;
  --line:        #e1e8ed;
  --bg:          #ffffff;
  --bg-soft:     #fafbfc;
  --bg-grey:     #f2f5f7;
  --white:       #ffffff;
  --accent:      #0693e3;

  --radius:      16px;
  --radius-sm:   10px;
  --shadow-sm:   0 2px 10px rgba(25, 42, 61, .06);
  --shadow:      0 10px 30px rgba(25, 42, 61, .09);
  --shadow-lg:   0 20px 50px rgba(25, 42, 61, .14);

  --font-head: "Urbanist", "DM Sans", "Helvetica Neue", Arial, sans-serif;
  --font-body: "DM Sans", "Open Sans", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;

  --nav-h: 70px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--navy);
  line-height: 1.22;
  margin: 0 0 .5em;
  font-weight: 700;
  letter-spacing: -.01em;
}
p { margin: 0 0 1em; }
ul { margin: 0; padding-left: 1.15rem; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section[id], footer[id] { scroll-margin-top: calc(var(--nav-h) + 14px); }
.section { padding: 88px 0; }
.section.alt { background: var(--bg-grey); }
.section.soft { background: var(--bg-soft); }

/* Section headings */
.sec-head { max-width: 760px; margin: 0 auto 52px; text-align: center; }
.sec-kicker {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--blue);
  background: var(--blue-50);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.sec-head h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); margin-bottom: .35em; }
.sec-head p { color: var(--muted); font-size: 1.05rem; margin: 0; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-head); font-weight: 700;
  font-size: .95rem; letter-spacing: .03em;
  padding: 14px 28px; border-radius: 999px;
  border: 2px solid transparent; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  text-align: center;
}
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 8px 20px rgba(21,89,237,.28); }
.btn-primary:hover { background: var(--blue-600); transform: translateY(-2px); color:#fff; }
.btn-outline { background: rgba(255,255,255,.9); color: var(--navy); border-color: var(--navy); }
.btn-outline:hover { background: var(--navy); color: #fff; transform: translateY(-2px); }
.btn-ghost { background: var(--blue-50); color: var(--blue); }
.btn-ghost:hover { background: var(--blue); color:#fff; }
.btn svg { width: 17px; height: 17px; }

/* ============ Top navigation ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .25s ease, border-color .25s ease;
}
.nav.scrolled { box-shadow: var(--shadow-sm); border-bottom-color: var(--line); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-head); font-weight: 800; color: var(--navy); font-size: 1.12rem; letter-spacing: -.01em; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--blue-bright), var(--blue-600));
  display: grid; place-items: center; color: #fff;
}
.brand-mark svg { width: 22px; height: 22px; }
.brand small { display:block; font-family: var(--font-body); font-weight: 500; font-size: .72rem; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 9px 13px; border-radius: 8px;
  color: var(--ink); font-weight: 500; font-size: .94rem; transition: color .15s, background .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--blue); background: var(--blue-50); }
.nav-cta { margin-left: 8px; padding: 10px 20px !important; font-size: .9rem !important; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; color: var(--navy); }
.nav-toggle svg { width: 26px; height: 26px; }

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: clamp(480px, 78vh, 680px);
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + 40px) 24px 70px;
  background-image:
    linear-gradient(180deg, rgba(255,255,255,.9) 0%, rgba(255,255,255,.62) 34%, rgba(255,255,255,.28) 62%, rgba(25,42,61,.55) 100%),
    url("../assets/hero/chengdu-pano.jpg");
  background-size: cover; background-position: center 38%;
}
.hero-inner { max-width: 900px; }
.hero .badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.9); border: 1px solid var(--line);
  color: var(--blue); font-family: var(--font-head); font-weight: 700;
  font-size: .82rem; letter-spacing: .14em; text-transform: uppercase;
  padding: 8px 18px; border-radius: 999px; box-shadow: var(--shadow-sm); margin-bottom: 22px;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; color: var(--navy); margin-bottom: 18px; text-wrap: balance; }
.hero .theme {
  font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--navy); font-weight: 600;
  font-family: var(--font-head); margin-bottom: 20px;
}
.hero .meta-line { display: flex; flex-wrap: wrap; gap: 10px 26px; justify-content: center; margin-bottom: 30px; font-size: 1.05rem; font-weight: 600; color: var(--navy); }
.hero .meta-line span { display: inline-flex; align-items: center; gap: 8px; }
.hero .meta-line svg { width: 19px; height: 19px; color: var(--blue); }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero .hero-actions .btn-outline { border-color: var(--navy); }

/* Key info strip */
.infostrip { margin-top: -52px; position: relative; z-index: 5; }
.infostrip-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; border: 1px solid var(--line); }
.info-item { text-align: center; padding: 6px 8px; border-right: 1px solid var(--line); }
.info-item:last-child { border-right: 0; }
.info-item .ic { width: 42px; height: 42px; margin: 0 auto 10px; border-radius: 12px; background: var(--blue-50); color: var(--blue); display: grid; place-items: center; }
.info-item .ic svg { width: 22px; height: 22px; }
.info-item .lbl { font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-family: var(--font-head); font-weight: 700; margin-bottom: 3px; }
.info-item .val { font-weight: 700; color: var(--navy); font-size: .98rem; line-height: 1.35; }

/* ============ About ============ */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.about-text p { font-size: 1.04rem; }
.about-points { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 14px; }
.about-points li { display: flex; gap: 13px; align-items: flex-start; }
.about-points .tick { flex: none; width: 26px; height: 26px; border-radius: 50%; background: var(--blue-50); color: var(--blue); display: grid; place-items: center; margin-top: 2px; }
.about-points .tick svg { width: 15px; height: 15px; }
.about-points b { color: var(--navy); }
.about-card { background: linear-gradient(160deg, var(--navy), #22394f); color: #dbe6f2; border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); }
.about-card h3 { color: #fff; font-size: 1.3rem; margin-bottom: 18px; }
.about-card .q { font-size: 1.02rem; border-left: 3px solid var(--blue-bright); padding-left: 16px; margin-bottom: 18px; }
.about-card .stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 22px; }
.about-card .stat b { display:block; font-family: var(--font-head); font-size: 1.9rem; color: #fff; line-height: 1; }
.about-card .stat span { font-size: .85rem; color: #aebfd2; }

/* ============ Organizations ============ */
.org-lead { text-align:center; color: var(--muted); max-width: 720px; margin: -20px auto 44px; }
.org-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.org-card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding: 30px 26px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s; }
.org-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.org-card .role { font-family: var(--font-head); font-weight: 700; font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; color: var(--blue); margin-bottom: 12px; }
.org-card h3 { font-size: 1.13rem; margin-bottom: 8px; }
.org-card p { font-size: .95rem; color: var(--muted); margin: 0; }
.org-card.cohost { grid-column: span 1; }
.org-cohost-list { margin-top: 26px; display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.cohost-pill { background:#fff; border:1px dashed var(--line); border-radius: var(--radius-sm); padding: 18px 20px; text-align:center; font-weight: 600; color: var(--navy); }
.cohost-pill small { display:block; font-weight: 500; color: var(--muted); font-size: .82rem; margin-top: 3px; }

/* ============ CFP ============ */
.cfp-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: start; }
.track-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 14px; }
.track-list li { background:#fff; border:1px solid var(--line); border-radius: var(--radius-sm); padding: 16px 18px; display:flex; gap:14px; align-items:flex-start; box-shadow: var(--shadow-sm); }
.track-list .n { flex:none; width:30px;height:30px;border-radius:8px;background:var(--navy);color:#fff;display:grid;place-items:center;font-family:var(--font-head);font-weight:700;font-size:.9rem;}
.track-list b { color: var(--navy); display:block; font-family: var(--font-head); }
.track-list span { color: var(--muted); font-size:.93rem; }
.dates-card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); position: sticky; top: 92px; }
.dates-card h3 { font-size: 1.2rem; }
.date-row { display:flex; justify-content:space-between; gap:16px; padding: 13px 0; border-bottom:1px solid var(--line); font-size:.96rem; }
.date-row:last-of-type { border-bottom:0; }
.date-row .d { font-weight:700; color:var(--navy); font-family:var(--font-head); white-space:nowrap; }
.date-row .e { color: var(--muted); text-align:right; }
.date-row.hl .d { color: var(--blue); }
.tbd { font-size:.78rem; font-weight:700; color:#b4790a; background:#fdf3e0; padding:2px 8px; border-radius:6px; margin-left:6px; letter-spacing:.04em;}

/* CFP special-issue scope */
.scope-block { background:#fff; border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px 22px; margin-bottom:14px; box-shadow:var(--shadow-sm); }
.scope-title { display:flex; gap:12px; align-items:center; font-family:var(--font-head); font-weight:700; color:var(--navy); font-size:1.04rem; margin-bottom:10px; }
.scope-title .n { flex:none; width:30px;height:30px;border-radius:8px;background:var(--navy);color:#fff;display:grid;place-items:center;font-size:.85rem; }
.scope-items { list-style:none; margin:0; padding:0; columns:2; column-gap:26px; }
.scope-items li { position:relative; padding-left:15px; margin-bottom:6px; font-size:.89rem; line-height:1.5; break-inside:avoid; color:var(--ink); }
.scope-items li::before { content:""; position:absolute; left:1px; top:.6em; width:6px; height:6px; border-radius:50%; background:var(--blue-bright); }
.howto { margin-top:18px; padding-top:16px; border-top:1px solid var(--line); font-size:.92rem; }
.howto h4 { font-size:1rem; margin-bottom:8px; }
.howto ol { margin:6px 0 14px; padding-left:1.15rem; display:grid; gap:7px; }
.howto b { color:var(--navy); }
.journal-meta { font-size:.82rem; color:var(--muted); border-top:1px solid var(--line); margin-top:14px; padding-top:12px; line-height:1.55; }
.ext-link svg { width:15px;height:15px; }
.scope-mini { display:grid; grid-template-columns:1fr; gap:14px; margin-bottom:16px; }
.scope-mini-card { background:#fff; border:1px solid var(--line); border-radius:var(--radius-sm); padding:18px; box-shadow:var(--shadow-sm); display:flex; gap:12px; align-items:flex-start; transition:transform .18s, box-shadow .18s; }
.scope-mini-card:hover { transform:translateY(-3px); box-shadow:var(--shadow); }
.scope-mini-card .n { flex:none; width:30px;height:30px;border-radius:8px;background:var(--navy);color:#fff;display:grid;place-items:center;font-family:var(--font-head);font-size:.85rem;font-weight:700; }
.scope-mini-card h4 { margin:3px 0 0; font-size:.98rem; line-height:1.35; }
.cfp-detail-link { display:flex; gap:14px; align-items:center; background:var(--blue-50); border:1px solid #cdd9f5; border-radius:var(--radius-sm); padding:15px 18px; color:var(--navy); transition:background .15s; }
.cfp-detail-link:hover { background:#dbe8fd; color:var(--navy); }
.cfp-detail-link .ic { flex:none; width:40px;height:40px;border-radius:10px;background:#fff;color:#07c160;display:grid;place-items:center; }
.cfp-detail-link .ic svg { width:22px;height:22px; }
.cfp-detail-link b { font-family:var(--font-head); display:block; font-size:.95rem; }
.cfp-detail-link small { color:var(--muted); font-size:.82rem; }
.cfp-detail-link > svg { margin-left:auto; flex:none; width:18px;height:18px;color:var(--blue); }
.detail-link-note { margin-top:10px; font-size:.84rem; color:var(--muted); text-align:center; }
.detail-link-note a { font-weight:600; }
@media (max-width:600px){ .scope-items { columns:1; } }

/* ============ Topics ============ */
.topic-grid { display:grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.topic-card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding: 30px 24px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s, border-color .2s; position:relative; overflow:hidden; }
.topic-card::before { content:""; position:absolute; inset:0 0 auto 0; height:4px; background:linear-gradient(90deg,var(--blue-bright),var(--blue)); transform:scaleX(0); transform-origin:left; transition:transform .25s; }
.topic-card:hover { transform:translateY(-6px); box-shadow:var(--shadow); border-color:#cdd9f5; }
.topic-card:hover::before { transform:scaleX(1); }
.topic-num { font-family:var(--font-head); font-weight:800; font-size:.85rem; color:var(--blue); letter-spacing:.1em; }
.topic-ic { width:52px;height:52px;border-radius:14px;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;margin:14px 0 18px;}
.topic-ic svg { width:27px;height:27px; }
.topic-card h3 { font-size:1.12rem; min-height: 2.7em; }
.topic-card p { color:var(--muted); font-size:.93rem; margin:0; }

/* ============ Programme ============ */
.day-tabs { display:flex; gap:10px; justify-content:center; margin-bottom:34px; flex-wrap:wrap; }
.day-tab { font-family:var(--font-head); font-weight:700; font-size:.98rem; padding:12px 26px; border-radius:999px; border:2px solid var(--line); background:#fff; color:var(--ink); cursor:pointer; transition: all .18s; }
.day-tab.active { background:var(--blue); border-color:var(--blue); color:#fff; box-shadow:0 8px 20px rgba(21,89,237,.25); }
.schedule { display:none; }
.schedule.active { display:block; animation: fade .3s ease; }
@keyframes fade { from {opacity:0; transform:translateY(6px);} to {opacity:1; transform:none;} }
.schedule-day-label { text-align:center; color:var(--muted); font-family:var(--font-head); font-weight:600; margin:-14px 0 22px; }
.sched-table { width:100%; border-collapse: separate; border-spacing:0; background:#fff; border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow-sm); }
.sched-table thead th { background:var(--navy); color:#fff; text-align:left; font-family:var(--font-head); font-size:.82rem; letter-spacing:.08em; text-transform:uppercase; padding:15px 22px; }
.sched-table td { padding:17px 22px; border-top:1px solid var(--line); vertical-align:top; }
.sched-table tbody tr:nth-child(even) td { background:var(--bg-soft); }
.sched-table .time { width:180px; font-family:var(--font-head); font-weight:700; color:var(--blue); white-space:nowrap; }
.sched-table .session b { color:var(--navy); font-family:var(--font-head); font-size:1.02rem; }
.sched-table .session span.tag { display:inline-block; margin-bottom:7px; }
.sched-table .session span:not(.tag) { display:block; color:var(--muted); font-size:.92rem; margin-top:2px; }
.sched-table tr.break td { background:var(--blue-50) !important; text-align:center; }
.sched-table tr.break .time { color:var(--navy); }
.sched-table tr.break .session b { color:var(--navy); text-transform:uppercase; letter-spacing:.04em; font-size:.9rem; }
.tag { display:inline-block; font-family:var(--font-head); font-weight:700; font-size:.7rem; letter-spacing:.08em; text-transform:uppercase; padding:3px 10px; border-radius:999px; margin-right:8px; vertical-align:middle;}
.tag.keynote { background:#fdeef0; color:#c0394f; }
.tag.workshop { background:#e7f6ee; color:#15824b; }
.tag.paper { background:#eef0fd; color:#4354d6; }

/* ============ Previous editions timeline ============ */
.timeline { position:relative; max-width: 860px; margin: 0 auto; padding-left: 8px; }
.timeline::before { content:""; position:absolute; left: 19px; top:6px; bottom:6px; width:3px; background:linear-gradient(180deg,var(--blue-bright),#c4d6f7); border-radius:3px; }
.tl-item { position:relative; padding:0 0 30px 64px; }
.tl-item:last-child { padding-bottom:0; }
.tl-dot { position:absolute; left:8px; top:4px; width:24px; height:24px; border-radius:50%; background:#fff; border:4px solid var(--blue); box-shadow:0 0 0 4px var(--blue-50); }
.tl-card { background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:22px 26px; box-shadow:var(--shadow-sm); }
.tl-year { display:inline-block; font-family:var(--font-head); font-weight:800; color:var(--blue); font-size:1.05rem; margin-bottom:4px; }
.tl-place { float:right; font-size:.85rem; color:var(--muted); font-weight:600; }
.tl-card h3 { font-size:1.08rem; margin-bottom:6px; }
.tl-card p { font-size:.93rem; color:var(--muted); margin:0 0 8px; }
.tl-speakers { font-size:.88rem; color:var(--ink); }
.tl-speakers b { color:var(--navy); font-family:var(--font-head); }

/* ============ Speakers ============ */
.chair-grid { display:grid; grid-template-columns: repeat(2, 320px); justify-content:center; gap:30px; }
.chair-card { background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:34px 28px; text-align:center; box-shadow:var(--shadow-sm); transition:transform .2s, box-shadow .2s; }
.chair-card:hover { transform:translateY(-5px); box-shadow:var(--shadow); }
.chair-photo { width:150px;height:150px;border-radius:50%;object-fit:cover;object-position:top center; margin:0 auto 18px; border:5px solid var(--blue-50); box-shadow:var(--shadow-sm); background:var(--bg-grey); }
.chair-role { display:inline-block; font-family:var(--font-head); font-weight:700; font-size:.74rem; letter-spacing:.12em; text-transform:uppercase; color:var(--blue); background:var(--blue-50); padding:5px 14px; border-radius:999px; margin-bottom:10px;}
.chair-card h3 { font-size:1.25rem; margin-bottom:4px; }
.chair-title { font-weight:600; color:var(--navy); font-size:.95rem; margin-bottom:2px; }
.chair-aff { color:var(--muted); font-size:.9rem; }
.more-speakers-note { text-align:center; color:var(--muted); margin-top:34px; font-size:.95rem; }

/* ============ Venue ============ */
.venue-grid { display:grid; grid-template-columns: 1fr 1fr; gap:40px; align-items:stretch; }
.venue-card h3 { font-size:1.3rem; }
.venue-placeholder { border:2px dashed #d8b45a; background:#fdf9ec; border-radius:var(--radius-sm); padding:18px 20px; color:#8a6410; font-size:.94rem; margin:18px 0; display:flex; gap:12px; align-items:flex-start;}
.venue-placeholder svg { width:22px;height:22px;flex:none;margin-top:2px;}
.venue-list { list-style:none; padding:0; margin:16px 0 0; display:grid; gap:14px;}
.venue-list li { display:flex; gap:13px; }
.venue-list .ic {flex:none;width:38px;height:38px;border-radius:10px;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;}
.venue-list .ic svg{width:20px;height:20px;}
.venue-list b{color:var(--navy);font-family:var(--font-head);display:block;}
.venue-list span{color:var(--muted);font-size:.93rem;}
.map-box { border-radius:var(--radius); overflow:hidden; border:1px solid var(--line); box-shadow:var(--shadow-sm); min-height:340px; display:grid; place-items:center; background:
   linear-gradient(135deg, #eaf1fc 0%, #f4f8ff 100%); position:relative; text-align:center; padding:30px;}
.map-box .map-inner { color:var(--muted); }
.map-box .map-inner svg { width:56px;height:56px;color:var(--blue); margin:0 auto 12px;}
.map-box h4 { font-size:1.1rem; }

/* ============ Registration ============ */
.register-wrap { display:grid; grid-template-columns: .85fr 1.15fr; gap:44px; align-items:start; }
.register-info h3 { font-size:1.4rem; }
.register-info .perk { display:flex;gap:13px;margin-bottom:16px;align-items:flex-start;}
.register-info .perk .tick{flex:none;width:26px;height:26px;border-radius:50%;background:var(--blue-50);color:var(--blue);display:grid;place-items:center;margin-top:2px;}
.register-info .perk svg{width:15px;height:15px;}
.register-info .perk b{color:var(--navy);font-family:var(--font-head);}
.form-card { background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);}
.form-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.field { display:flex; flex-direction:column; gap:7px; }
.field.full { grid-column:1 / -1; }
.field label { font-family:var(--font-head); font-weight:700; font-size:.88rem; color:var(--navy); }
.field label .req{color:#d23b53;}
.field input, .field select, .field textarea {
  font-family:var(--font-body); font-size:.97rem; color:var(--navy);
  padding:12px 14px; border:1.5px solid var(--line); border-radius:var(--radius-sm); background:var(--bg-soft);
  transition:border-color .15s, box-shadow .15s; width:100%;
}
.field textarea { resize:vertical; min-height:90px; }
.field input:focus, .field select:focus, .field textarea:focus { outline:none; border-color:var(--blue); background:#fff; box-shadow:0 0 0 3px var(--blue-50); }
.radio-row { display:flex; gap:10px; }
.radio-pill { flex:1; position:relative; }
.radio-pill input { position:absolute; opacity:0; inset:0; cursor:pointer; }
.radio-pill span { display:block; text-align:center; padding:12px; border:1.5px solid var(--line); border-radius:var(--radius-sm); background:var(--bg-soft); font-weight:600; font-size:.92rem; color:var(--ink); cursor:pointer; transition:all .15s; }
.radio-pill input:checked + span { background:var(--blue-50); border-color:var(--blue); color:var(--blue); }
.form-actions { margin-top:24px; }
.form-actions .btn { width:100%; justify-content:center; }
.form-status { margin-top:16px; padding:14px 16px; border-radius:var(--radius-sm); font-size:.94rem; display:none; }
.form-status.ok { display:block; background:#e7f6ee; color:#15824b; border:1px solid #bfe6d0; }
.form-status.err { display:block; background:#fdeef0; color:#c0394f; border:1px solid #f3ccd3; }

/* ============ Footer ============ */
.footer { background:var(--navy); color:#b9c9da; padding:64px 0 28px; margin-top:0; }
.footer-grid { display:grid; grid-template-columns:1.3fr 1fr 1fr; gap:40px; margin-bottom:40px; }
.footer h4 { color:#fff; font-size:1.05rem; margin-bottom:16px; }
.footer .brand { color:#fff; margin-bottom:14px; }
.footer .brand small { color:#8fa6bd; }
.footer a { color:#b9c9da; }
.footer a:hover { color:#fff; }
.footer ul { list-style:none; padding:0; display:grid; gap:9px; font-size:.93rem; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.12); padding-top:24px; display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; font-size:.86rem; color:#8fa6bd; }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .infostrip-grid { grid-template-columns: repeat(3,1fr); }
  .info-item:nth-child(3) { border-right:0; }
  .topic-grid { grid-template-columns: repeat(2,1fr); }
  .about-grid, .cfp-grid, .venue-grid, .register-wrap { grid-template-columns:1fr; gap:32px; }
  .dates-card { position:static; }
}
@media (max-width: 860px) {
  .nav-links {
    position:absolute; top:var(--nav-h); left:0; right:0; background:#fff; flex-direction:column; align-items:stretch;
    gap:0; padding:10px 16px 18px; box-shadow:var(--shadow); border-top:1px solid var(--line); display:none;
  }
  .nav-links.open { display:flex; }
  .nav-links a { padding:13px 14px; font-size:1rem; }
  .nav-cta { margin:6px 0 0; text-align:center; justify-content:center; }
  .nav-toggle { display:block; }
  .section { padding:64px 0; }
  .footer-grid { grid-template-columns:1fr; gap:28px; }
  .chair-grid { grid-template-columns:1fr; max-width:340px; margin:0 auto; }
  .org-grid { grid-template-columns:1fr; }
  .org-cohost-list { grid-template-columns:1fr; }
}
@media (max-width: 600px) {
  body { font-size:15.5px; }
  .infostrip-grid { grid-template-columns:repeat(3,1fr); gap:8px; padding:16px 10px; }
  .info-item { padding:6px 4px; }
  .topic-grid { grid-template-columns:1fr; }
  .form-grid { grid-template-columns:1fr; }
  .sched-table .time { width:auto; }
  .sched-table td { padding:13px 15px; }
  .tl-place { float:none; display:block; margin-bottom:4px; }
  .hero { background-position: center 30%; }
}