:root {
  --bg: #000;
  --surface: #0d0d0d;
  --surface-2: #151515;
  --line: rgba(244, 120, 54, .45);
  --line-soft: #232323;
  --text: #fff;
  --muted: #b3b3b3;
  --dim: #7a7a7a;
  --accent: #f47836;
  --accent-hi: #ff8c4d;
  --ok: #6fd6a0;
  --err: #ff6b6b;
  --radius: 14px;
  --gutter: clamp(16px, 4vw, 52px);
  --maxw: 1240px;
  --logo-h: 40px; /* chiều cao chung của logo BTC — icon CG Record và Cast Grow Record bằng nhau */
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Montserrat", system-ui, sans-serif;
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 400; line-height: 1.15; }
h2 { font-size: clamp(26px, 3.2vw, 40px); text-transform: uppercase; letter-spacing: .01em; text-wrap: balance; }
p { margin: 0 0 1em; }
strong, b { font-weight: 600; }
.muted { color: var(--muted); }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .16em; font-size: 12px; font-weight: 600; margin-bottom: 14px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #000; text-decoration: none;
  font: 600 14px/1 "Montserrat", sans-serif; letter-spacing: .08em; text-transform: uppercase;
  padding: 18px 32px; border: 0; border-radius: 999px; cursor: pointer;
  box-shadow: 0 8px 30px -10px rgba(244,120,54,.7);
  transition: background .2s, transform .2s, box-shadow .2s;
}
.btn:hover { background: var(--accent-hi); transform: translateY(-1px); box-shadow: 0 12px 34px -10px rgba(244,120,54,.85); }
.btn:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-sm { padding: 10px 18px; font-size: 12px; box-shadow: none; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: wait; transform: none; }

/* Organizer logos — dùng chung ở hero & footer */
.org-logos { display: flex; align-items: center; flex-wrap: wrap; gap: 14px 22px; }
.org-logos img { height: var(--logo-h); width: auto; }
.org-logos .logo-sidefx { height: calc(var(--logo-h) * .85); }
.x { color: var(--dim); font-size: 22px; font-weight: 200; line-height: 1; }

/* Nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px var(--gutter);
  border-bottom: 1px solid transparent; transition: background .3s, border-color .3s;
}
.nav.scrolled { background: rgba(0,0,0,.72); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom-color: var(--line-soft); }
.nav-brand img { height: 30px; width: auto; opacity: 0; transition: opacity .3s; }
.nav.scrolled .nav-brand img { opacity: 1; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 12px; text-transform: uppercase; letter-spacing: .12em; font-weight: 500; }
.nav-links a:not(.btn) { text-decoration: none; color: var(--muted); transition: color .2s; position: relative; }
.nav-links a:not(.btn):hover, .nav-links a.active { color: var(--text); }
.nav-links a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--accent); }

/* Hero */
.hero { position: relative; min-height: calc(100vh - 84px); min-height: calc(100svh - 84px); display: flex; align-items: center; padding: 96px 0 72px; overflow: hidden; }
.hero-media { position: absolute; inset: 0; overflow: hidden; background: #000; }
.hero-bg { position: absolute; inset: 0; background: url("assets/swirl.jpg") right center / cover no-repeat; animation: drift 24s ease-in-out infinite alternate; }
@keyframes drift { from { transform: scale(1.04); } to { transform: scale(1.12) rotate(-2deg); } }
/* Video reel phủ kín hero (cover) — dùng container units để luôn lấp đầy dù hero cao hay thấp */
.hero-video { position: absolute; inset: 0; container-type: size; opacity: 0; transition: opacity 1.2s ease; pointer-events: none; }
.hero-video.playing { opacity: 1; }
.hero-video iframe { position: absolute; top: 50%; left: 50%; border: 0;
  width: max(100cqw, 177.78cqh); height: max(100cqh, 56.25cqw);
  transform: translate(-50%, -50%) scale(1.12); }
.hero-shade { position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(0,0,0,.94) 0%, rgba(0,0,0,.82) 32%, rgba(0,0,0,.35) 62%, rgba(0,0,0,.12) 100%),
    linear-gradient(0deg, #000 0%, rgba(0,0,0,0) 26%),
    linear-gradient(180deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,0) 18%); }
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 640px); }

/* Thanh điều khiển reel */
.reel-bar { position: absolute; right: var(--gutter); bottom: 28px; z-index: 2; display: flex; align-items: center; gap: 10px;
  max-width: min(520px, calc(100% - 2 * var(--gutter))); padding: 8px 8px 8px 16px;
  background: rgba(0,0,0,.55); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,.12); border-radius: 999px; font-size: 12px; }
.reel-bar[hidden] { display: none; }
.reel-live { display: inline-flex; align-items: center; gap: 7px; color: var(--accent); font-weight: 600; letter-spacing: .1em; text-transform: uppercase; font-size: 10px; white-space: nowrap; }
.reel-live i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: pulse 1.6s ease-in-out infinite; }
.reel-title { color: #ddd; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.reel-btn { flex: none; width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.06); color: #fff; cursor: pointer; display: grid; place-items: center; transition: background .2s, border-color .2s; }
.reel-btn:hover { background: var(--accent); border-color: var(--accent); color: #000; }
.reel-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.reel-btn .i-play, .reel-btn.on .i-pause, .reel-btn .i-on, .reel-btn.on .i-off { display: none; }
.reel-btn.on .i-play, .reel-btn.on .i-on { display: inline; }
#reel-pause.on .i-play { fill: currentColor; }

.hero-org { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 20px; margin-bottom: clamp(28px, 5vh, 52px); }
.hero-org-lbl { text-transform: uppercase; letter-spacing: .14em; font-size: 11px; color: var(--dim); padding-right: 20px; border-right: 1px solid var(--line-soft); }
.hero-logo img { width: min(580px, 100%); height: auto; }
.hero-tagline { margin: 22px 0 28px; max-width: 560px; color: var(--muted); font-size: clamp(15px, 1.4vw, 18px); }

.hero-news {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px;
  max-width: 600px; margin-bottom: 28px; padding: 12px 18px;
  background: rgba(20,20,20,.75); border: 1px solid var(--line-soft); border-left: 3px solid var(--accent); border-radius: 10px;
  text-decoration: none; transition: background .2s, border-color .2s;
}
.hero-news[hidden] { display: none; }
.hero-news:hover { background: rgba(32,32,32,.85); border-color: var(--line); }
.hn-tag { color: var(--accent); font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; white-space: nowrap; }
.new { display: inline-block; margin-right: 8px; background: var(--accent); color: #000; font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 4px; letter-spacing: .08em; vertical-align: 1px; }
.hn-tag .new { animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .5; } }
.hn-title { font-weight: 500; flex: 1 1 240px; min-width: 0; }
.hn-more { color: var(--muted); font-size: 12px; white-space: nowrap; }

.countdown { display: grid; grid-template-columns: repeat(4, minmax(0, 104px)); gap: 10px; margin-bottom: 32px; }
.cd-cell { border: 1px solid var(--line-soft); background: rgba(13,13,13,.8); border-radius: 12px; padding: 14px 6px 11px; text-align: center; }
.cd-num { display: block; font-size: clamp(28px, 3.6vw, 44px); font-weight: 300; line-height: 1; font-variant-numeric: tabular-nums; color: var(--accent); }
.cd-lbl { display: block; margin-top: 8px; font-size: 10px; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
.countdown.done { display: block; font-size: 20px; color: var(--accent); }

.hero-cta { display: flex; align-items: center; flex-wrap: wrap; gap: 16px 24px; }
.hero-fee { color: var(--muted); font-size: 14px; }
.hero-fee strong { color: var(--text); }

/* Dải thông tin sự kiện ngay dưới hero */
.facts-bar { position: relative; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line-soft); background: var(--surface); }
.facts-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.facts-list li { display: flex; gap: 12px; align-items: flex-start; padding: 22px 18px; border-left: 1px solid var(--line-soft); }
.facts-list li:first-child { border-left: 0; padding-left: 0; }
.facts-list svg { width: 20px; height: 20px; flex: none; margin-top: 2px; fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.facts-list small { display: block; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--dim); margin-bottom: 2px; }
.facts-list span { font-weight: 400; font-size: 14px; line-height: 1.45; }
.facts-list b { color: var(--accent); font-weight: 600; }

.scroll-hint { position: absolute; left: 50%; bottom: 22px; width: 22px; height: 36px; margin-left: -11px; border: 1.5px solid var(--dim); border-radius: 12px; }
.scroll-hint span { position: absolute; left: 50%; top: 7px; width: 3px; height: 7px; margin-left: -1.5px; border-radius: 2px; background: var(--accent); animation: scroll 1.8s ease-in-out infinite; }
@keyframes scroll { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(12px); } }

/* Sections */
.section { padding: clamp(68px, 9vw, 120px) 0; position: relative; }
.section-line::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, var(--line), var(--line-soft) 60%); }
.section-line::after { content: ""; position: absolute; top: -4px; left: var(--gutter); width: 9px; height: 9px; background: var(--accent); }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 88px); }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px 60px; flex-wrap: wrap; margin-bottom: 40px; }
.section-note { max-width: 420px; margin: 0; font-size: 15px; }

/* Updates */
#updates { padding-top: clamp(56px, 7vw, 88px); }
.updates { display: grid; gap: 12px; }
.upd { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 24px 28px; transition: border-color .2s; }
.upd:first-child { border-color: var(--line); background: linear-gradient(90deg, rgba(244,120,54,.08), var(--surface) 40%); }
.upd-date { color: var(--accent); font-weight: 600; font-size: 14px; font-variant-numeric: tabular-nums; }
.upd-date .new { display: table; margin: 8px 0 0; }
.upd h3 { font-size: 18px; font-weight: 500; margin-bottom: 6px; }
.upd p { color: var(--muted); margin: 0; }

/* About */
.about-text { font-size: 17px; }
.audience { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 56px; }
.aud { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 26px; }
.aud h3 { color: var(--accent); font-size: 17px; font-weight: 500; text-transform: uppercase; margin-bottom: 10px; letter-spacing: .03em; }
.aud p { color: var(--muted); font-size: 14px; margin: 0; }

/* Speakers */
.speakers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.spk { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .25s, border-color .25s; }
.spk:hover { transform: translateY(-3px); }
.spk-photo { aspect-ratio: 1; position: relative; overflow: hidden; background: var(--surface-2); }
.spk-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.spk:hover .spk-photo img { transform: scale(1.04); }
.spk-body { padding: 20px 20px 24px; flex: 1; display: flex; flex-direction: column; }
.spk-tag { font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--dim); margin-bottom: 10px; }
.spk-name { font-size: 21px; text-transform: uppercase; color: var(--accent); line-height: 1.2; margin-bottom: 6px; }
.spk-role { font-weight: 500; font-size: 14px; margin-bottom: 12px; }
.spk-topic { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; margin: auto 0 0; }
.spk.revealed { border-color: var(--line); }
.spk.revealed.new { animation: reveal 1.2s cubic-bezier(.2,.7,.2,1) both; }
@keyframes reveal { from { opacity: 0; transform: translateY(18px) scale(.97); filter: blur(8px); } to { opacity: 1; transform: none; filter: none; } }
.spk.locked .spk-photo { display: grid; place-items: center; background: radial-gradient(circle at 50% 45%, #1c1c1c, #090909 70%); }
.spk.locked .spk-photo svg { width: 42%; opacity: .85; animation: spin 18s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.spk.locked .spk-name { color: var(--text); letter-spacing: .2em; }
.spk-teaser { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.spk-timer { margin-top: auto; font-variant-numeric: tabular-nums; font-size: 14px; color: var(--accent); border-top: 1px solid var(--line-soft); padding-top: 12px; }
.spk-timer small { display: block; color: var(--dim); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; }

/* Timeline */
.timeline { list-style: none; padding: 0; margin: 8px 0 52px; display: grid; grid-template-columns: repeat(6, 1fr); position: relative; }
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 41px; height: 2px; background: var(--line-soft); }
.tl-item { position: relative; padding-right: 16px; }
.tl-time { color: var(--accent); font-weight: 600; font-size: 15px; }
.tl-dot { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); margin: 11px 0 20px; position: relative; box-shadow: 0 0 0 5px #000; }
.tl-item.accent .tl-dot { background: var(--ok); }
.tl-title { font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.tl-desc { color: var(--muted); font-size: 13px; }
.topics-lbl { font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--dim); margin-bottom: 12px; }
.topics { display: flex; flex-wrap: wrap; gap: 8px; }
.topics span { border: 1px solid var(--line-soft); border-radius: 999px; padding: 8px 16px; font-size: 13px; color: var(--muted); }

/* Register */
.register-section { background: radial-gradient(ellipse 60% 50% at 0% 50%, rgba(244,120,54,.07), transparent 70%); }
.register-info { position: sticky; top: 100px; align-self: start; }
.register-info > p { color: var(--muted); font-size: 17px; margin-top: 18px; }
.fee-box { margin-top: 32px; border-left: 2px solid var(--accent); padding: 4px 0 4px 24px; }
.fee-lbl { display: block; font-size: 15px; font-weight: 400; color: var(--muted); }
.fee-num { display: block; color: var(--accent); font-size: clamp(32px, 4vw, 46px); line-height: 1.2; margin: 4px 0 16px; }
.fee-num small { font-size: .45em; color: var(--muted); }
.fee-notes { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.fee-notes li { margin-bottom: 6px; }

.form { background: var(--surface); border: 1px solid var(--line-soft); border-radius: 18px; padding: clamp(22px, 3vw, 36px); display: grid; gap: 18px; }
.field { display: grid; gap: 7px; min-width: 0; border: 0; padding: 0; margin: 0; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label, legend { font-size: 13px; font-weight: 500; color: #ddd; padding: 0; }
input, select, textarea {
  width: 100%; background: #050505; color: var(--text); border: 1px solid #2c2c2c; border-radius: 10px;
  padding: 13px 14px; font: 400 15px "Montserrat", sans-serif; transition: border-color .2s;
}
select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--accent) 50%), linear-gradient(135deg, var(--accent) 50%, transparent 50%); background-position: calc(100% - 20px) 55%, calc(100% - 15px) 55%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 36px; }
input:hover, select:hover, textarea:hover { border-color: #444; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); outline: none; }
.invalid input, .invalid select { border-color: var(--err); }
textarea { resize: vertical; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.chips label { cursor: pointer; }
.chips input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chips span { display: inline-block; border: 1px solid #2c2c2c; border-radius: 999px; padding: 7px 14px; font-size: 13px; font-weight: 400; color: var(--muted); transition: all .15s; }
.chips input:checked + span { border-color: var(--accent); color: #000; background: var(--accent); font-weight: 500; }
.chips input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.check { display: flex; gap: 12px; align-items: flex-start; font-weight: 400; color: var(--muted); cursor: pointer; }
.check input { width: 18px; height: 18px; margin: 2px 0 0; flex: none; accent-color: var(--accent); }
.check.invalid span { color: var(--err); }
.hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; }
.form-msg { margin: 0; min-height: 1.4em; font-size: 14px; text-align: center; }
.form-msg.ok { color: var(--ok); }
.form-msg.err { color: var(--err); }
.form.sent { text-align: center; padding: 64px 32px; align-content: center; }
.form.sent h3 { color: var(--accent); font-size: 26px; text-transform: uppercase; margin-bottom: 10px; }
.form.sent p { color: var(--muted); }

/* FAQ */
.faq { display: grid; gap: 10px; }
.faq details { background: var(--surface); border: 1px solid var(--line-soft); border-radius: 12px; padding: 0 22px; transition: border-color .2s; }
.faq details[open] { border-color: var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 28px 18px 0; font-weight: 500; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); color: var(--accent); font-size: 22px; font-weight: 300; transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { color: var(--muted); margin: 0 0 18px; font-size: 15px; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 40px 0 28px; }
.footer-inner { display: flex; align-items: center; gap: 20px 32px; flex-wrap: wrap; }
.footer-lbl { text-transform: uppercase; letter-spacing: .14em; font-size: 11px; color: var(--dim); }
.footer-contact { margin-left: auto; color: var(--muted); font-size: 14px; display: flex; gap: 20px; flex-wrap: wrap; }
.footer-contact a { color: var(--muted); text-decoration: none; }
.footer-contact a:hover { color: var(--accent); }
.footer-bottom { margin-top: 30px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 24px; color: var(--dim); font-size: 12px; }

/* Sticky CTA (mobile) */
.sticky-cta { display: none; }

/* Scroll-in */
.fade { opacity: 0; transform: translateY(16px); transition: opacity .8s, transform .8s; }
.fade.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1080px) {
  .facts-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .facts-list li { border-left: 0; padding: 16px 16px 16px 0; }
  .facts-list li:nth-child(n+4) { border-top: 1px solid var(--line-soft); }
  .speakers { grid-template-columns: repeat(2, 1fr); }
  .timeline { grid-template-columns: repeat(3, 1fr); row-gap: 28px; }
  .timeline::before { display: none; }
  .scroll-hint { display: none; }
}
@media (max-width: 760px) {
  :root { --logo-h: 25px; }
  .nav-links a:not(.btn) { display: none; }
  .nav { background: rgba(0,0,0,.72); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
  .nav-brand img { opacity: 1; height: 26px; }
  .hero { padding: 84px 0 48px; align-items: flex-start; }
  .hero-bg { background-position: 72% center; opacity: .5; }
  /* Mobile: reel thành dải video 16:9 ngay dưới menu, nội dung nằm bên dưới */
  .hero { display: block; min-height: 0; padding: 58px 0 40px; }
  .hero-media { position: relative; inset: auto; aspect-ratio: 16 / 9; margin-bottom: 26px; }
  .hero-bg { opacity: .6; }
  .hero-video iframe { transform: translate(-50%, -50%) scale(1.04); }
  .hero-shade { background: linear-gradient(0deg, #000 0%, rgba(0,0,0,0) 30%); }
  .reel-bar { left: 10px; right: 10px; bottom: 10px; max-width: none; padding: 4px 4px 4px 12px; gap: 8px; }
  .reel-btn { width: 30px; height: 30px; }
  .hero-org { gap: 10px; margin-bottom: 28px; }
  .hero-org-lbl { border: 0; padding: 0; width: 100%; }
  .org-logos { gap: 8px 9px; }
  .x { font-size: 16px; }
  .hero-tagline { margin: 16px 0 20px; }
  .hero-news { margin-bottom: 20px; }
  .countdown { grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 24px; }
  .hero-cta .btn { width: 100%; }
  .hero-fee { width: 100%; text-align: center; }
  .facts-list { grid-template-columns: 1fr 1fr; column-gap: 16px; }
  .facts-list li { padding: 14px 0; }
  .facts-list li:nth-child(n+3) { border-top: 1px solid var(--line-soft); }
  .grid-2 { grid-template-columns: 1fr; }
  .audience { grid-template-columns: 1fr; margin-top: 36px; }
  .timeline { grid-template-columns: 1fr; margin-left: 6px; border-left: 2px solid var(--line-soft); padding-left: 22px; }
  .tl-dot { position: absolute; left: -31px; top: 3px; margin: 0; }
  .upd { grid-template-columns: 1fr; gap: 6px; padding: 20px; }
  .upd-date .new { display: inline-block; margin: 0 0 0 8px; }
  .field-row { grid-template-columns: 1fr; }
  .register-info { position: static; }
  .footer-contact { margin-left: 0; }
  .footer { padding-bottom: 96px; }
  .sticky-cta {
    position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 60;
    display: flex; justify-content: space-between; align-items: center; gap: 12px;
    padding: 14px 20px; border-radius: 999px; background: var(--accent); color: #000; text-decoration: none;
    font-size: 13px; box-shadow: 0 10px 30px rgba(0,0,0,.6);
    transform: translateY(140%); transition: transform .3s;
  }
  .sticky-cta.show { transform: none; }
  .sticky-cta span { font-weight: 500; }
  .sticky-cta strong { text-transform: uppercase; letter-spacing: .06em; font-size: 12px; }
}
@media (max-width: 480px) {
  .speakers { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}