/* =========================================================
   Научно-практическая конференция — НБ СФУ
   Палитра взята из фирменной графики конференции:
   тёмный зелёный → электрик-синий → циан → лайм
   ========================================================= */
:root {
  --bg: #04140e;
  --bg-2: #061d17;
  --ink: #0a1f2e;
  --ink-2: #44596a;
  --paper: #f1f7f4;
  --white: #fff;

  --green: #1fa83c;
  --lime: #b4f03a;
  --blue: #2656ff;
  --cyan: #58d6ff;
  --deep: #0b2e8a;

  --line: rgba(255, 255, 255, .16);
  --glass: rgba(255, 255, 255, .07);
  --grad: linear-gradient(100deg, var(--cyan), var(--lime));

  --f-display: 'Unbounded', 'Manrope', system-ui, sans-serif;
  --f-body: 'Manrope', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --r: 24px;
  --gutter: clamp(18px, 4vw, 48px);
  --header-h: 76px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  /* honeycomb pattern (молекулярная сетка) */
  --hex-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='49' viewBox='0 0 28 49'%3E%3Cpath fill='%2358d6ff' fill-opacity='.07' d='M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z'/%3E%3C/svg%3E");
  --hex-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='49' viewBox='0 0 28 49'%3E%3Cpath fill='%232656ff' fill-opacity='.07' d='M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z'/%3E%3C/svg%3E");
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--white);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }
section[id] { scroll-margin-top: calc(var(--header-h) - 8px); }

.container { width: min(1240px, 100% - var(--gutter) * 2); margin-inline: auto; }

.skip {
  position: fixed; left: 12px; top: -60px; z-index: 200;
  background: var(--lime); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-weight: 700;
  transition: top .2s;
}
.skip:focus { top: 12px; }

.ico {
  width: 1.25em; height: 1.25em; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
}

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: var(--d, 0s); }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- buttons ---------- */
.btn {
  --pad-y: 16px;
  display: inline-flex; align-items: center; justify-content: center; gap: .7em;
  padding: var(--pad-y) 26px; border-radius: 999px;
  font-weight: 700; font-size: 15.5px; line-height: 1.25; text-decoration: none; text-align: left;
  border: 1.5px solid transparent; cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s, background .25s, border-color .25s, color .25s;
}
.btn .ico--arrow { width: 1.3em; height: 1.3em; transition: transform .25s var(--ease); }
.btn:hover .ico--arrow { transform: translateX(4px); }
.btn:hover { transform: translateY(-2px); }
.btn--sm { --pad-y: 10px; padding-inline: 20px; font-size: 13.5px; }
.btn--block { width: 100%; }
.btn--primary {
  color: #04140e; background: linear-gradient(100deg, #8fe8ff 0%, #b4f03a 100%);
  box-shadow: 0 10px 30px -8px rgba(120, 240, 90, .55), inset 0 1px 0 rgba(255,255,255,.5);
}
.btn--primary:hover { box-shadow: 0 16px 40px -8px rgba(120, 240, 90, .75), inset 0 1px 0 rgba(255,255,255,.5); }
.btn--ghost {
  color: var(--white); background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.4);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.btn--ghost:hover { background: rgba(255,255,255,.18); border-color: #fff; }

/* ---------- header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--header-h);
  transition: background .35s, box-shadow .35s, backdrop-filter .35s;
}
.site-header.is-solid {
  background: rgba(4, 20, 14, .72);
  -webkit-backdrop-filter: blur(18px) saturate(1.4); backdrop-filter: blur(18px) saturate(1.4);
  box-shadow: 0 1px 0 var(--line);
}
.site-header__in {
  width: min(1360px, 100% - var(--gutter) * 2); height: 100%; margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand img { height: 44px; width: auto; filter: brightness(0) invert(1); }
.nav { display: flex; align-items: center; gap: clamp(14px, 2vw, 30px); }
.nav a:not(.btn) {
  position: relative; text-decoration: none; padding: 6px 0; white-space: nowrap;
  font-size: 12.5px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; color: rgba(255,255,255,.82);
  transition: color .2s;
}
.nav a:not(.btn)::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; border-radius: 2px;
  background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.nav a:not(.btn):hover, .nav a.is-active { color: #fff; }
.nav a:not(.btn):hover::after, .nav a.is-active::after { transform: scaleX(1); }
.nav__cta { margin-left: 6px; }

.burger { display: none; width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 14px; background: var(--glass); cursor: pointer; position: relative; }
.burger span { position: absolute; left: 13px; right: 13px; height: 2px; background: #fff; border-radius: 2px; transition: transform .3s var(--ease), opacity .2s; }
.burger span:nth-child(1) { top: 16px; } .burger span:nth-child(2) { top: 22px; } .burger span:nth-child(3) { top: 28px; }
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero {
  position: relative; isolation: isolate; min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding-top: calc(var(--header-h) + 40px); overflow: hidden;
}
.hero__bg {
  position: absolute; inset: -3%; z-index: -3;
  background: url("../assets/img/hero-bg.jpg") 60% center / cover no-repeat;
  animation: heroDrift 40s ease-in-out infinite alternate;
}
@keyframes heroDrift { from { transform: scale(1) translate3d(0,0,0); } to { transform: scale(1.08) translate3d(-1.5%, 1%, 0); } }
.hero__net { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2; pointer-events: none; }
.hero__shade {
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(90deg, rgba(3, 18, 11, .88) 0%, rgba(3, 18, 11, .62) 38%, rgba(3, 18, 11, .08) 78%),
    linear-gradient(180deg, rgba(3,18,11,.55) 0%, rgba(3,18,11,0) 24%, rgba(3,18,11,0) 70%, var(--bg) 100%);
}
.hero__in { padding-block: clamp(24px, 5vh, 64px) clamp(36px, 6vh, 72px); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px; margin-bottom: 26px;
  padding: 9px 18px 9px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255,255,255,.08);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  font-size: 12.5px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
}
.eyebrow__dot { width: 9px; height: 9px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 0 rgba(180,240,58,.7); animation: pulse 2.2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 12px rgba(180,240,58,0); } 100% { box-shadow: 0 0 0 0 rgba(180,240,58,0); } }

.hero__title {
  max-width: 17.5em;
  font-family: var(--f-display); font-weight: 600; text-transform: none;
  font-size: clamp(1.4rem, 3.55vw, 3.4rem); line-height: 1.18; letter-spacing: -.015em;
  text-wrap: balance;
  text-shadow: 0 4px 40px rgba(0, 30, 10, .35);
}
.hero__title em {
  font-style: normal;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}

.hero__facts { display: flex; flex-wrap: wrap; align-items: stretch; gap: 14px; margin-top: clamp(26px, 4vh, 44px); }
.fact, .countdown {
  display: flex; align-items: center; gap: 14px; padding: 14px 22px 14px 18px; border-radius: 20px;
  border: 1px solid var(--line); background: rgba(255,255,255,.08);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.fact .ico { width: 30px; height: 30px; color: var(--lime); }
.fact b { display: block; font-family: var(--f-display); font-weight: 600; font-size: 1.05rem; line-height: 1.25; }
.fact--date b { font-size: 1.35rem; }
.fact span { display: block; font-size: 13.5px; color: rgba(255,255,255,.75); line-height: 1.3; }
.countdown { gap: 18px; padding-block: 10px; }
.countdown[hidden] { display: none; }
.countdown__label { font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.7); max-width: 6em; line-height: 1.3; }
.countdown__grid { display: flex; gap: 14px; }
.countdown__grid div { text-align: center; min-width: 46px; }
.countdown__grid b { display: block; font-family: var(--f-display); font-weight: 600; font-size: 1.55rem; line-height: 1.1; font-variant-numeric: tabular-nums; }
.countdown__grid span { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.65); }
.countdown.is-live { border-color: rgba(180,240,58,.6); }
.countdown.is-live .countdown__label { max-width: none; color: var(--lime); }

.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; }

/* ticker */
.ticker {
  position: relative; border-block: 1px solid var(--line); overflow: hidden;
  background: rgba(4, 20, 14, .45); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  padding-block: 14px;
}
.ticker__track { display: flex; align-items: center; gap: 28px; width: max-content; animation: ticker 55s linear infinite; }
.ticker__track span { white-space: nowrap; font-family: var(--f-display); font-size: 13px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.85); }
.ticker__track i { width: 8px; height: 8px; background: var(--lime); transform: rotate(45deg); flex: none; }
@keyframes ticker { to { transform: translateX(-50%); } }

/* ---------- sections ---------- */
.section { position: relative; isolation: isolate; overflow: hidden; padding-block: clamp(72px, 10vw, 140px); }
.section--dark { background: var(--bg); color: #fff; }
.section--dark::before { content: ""; position: absolute; inset: 0; z-index: -2; background: var(--hex-dark); opacity: .9; mask-image: linear-gradient(180deg, transparent, #000 20%, #000 80%, transparent); -webkit-mask-image: linear-gradient(180deg, transparent, #000 20%, #000 80%, transparent); }
.section--light { background: var(--paper); color: var(--ink); }
.section--light::before { content: ""; position: absolute; inset: 0; z-index: -2; background: var(--hex-light); mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent); -webkit-mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent); }

.section__glow {
  position: absolute; z-index: -1; pointer-events: none; width: 70vw; height: 70vw; max-width: 900px; max-height: 900px; right: -22vw; top: -8%;
  background: radial-gradient(closest-side, rgba(38, 86, 255, .34), rgba(38, 86, 255, 0) 70%); filter: blur(10px);
}
.section__glow::after {
  content: ""; position: absolute; width: 80%; height: 80%; left: -90%; top: 60%;
  background: radial-gradient(closest-side, rgba(31, 168, 60, .38), rgba(31,168,60,0) 70%);
}
.section__glow--b { right: auto; left: -25vw; top: 10%; }
.section__glow--b::after { left: 110%; top: 40%; }
.section__glow--c { top: auto; bottom: -25%; }

.section__head { margin-bottom: clamp(34px, 5vw, 64px); }
.section__head--split { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 28px; }
.section__num {
  display: inline-block; margin-bottom: 14px;
  font-family: var(--f-display); font-size: 13px; font-weight: 600; letter-spacing: .16em;
  padding: 6px 12px; border-radius: 999px; border: 1px solid currentColor; color: var(--lime);
}
.section--light .section__num { color: var(--blue); }
.section__title {
  font-family: var(--f-display); font-weight: 600; text-transform: uppercase;
  font-size: clamp(1.85rem, 4.4vw, 3.5rem); line-height: 1.08; letter-spacing: -.01em;
}

/* ---------- about ---------- */
.about__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(28px, 5vw, 72px); align-items: center; }
.about__label { font-family: var(--f-display); font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--lime); margin-bottom: 18px; display: flex; align-items: center; gap: 14px; }
.about__lead { font-size: clamp(1.15rem, 1.9vw, 1.6rem); line-height: 1.6; font-weight: 500; color: rgba(255,255,255,.92); }
.about__lead mark { background: none; color: inherit; font-weight: 800; }

.chart {
  padding: 22px 22px 14px; border-radius: var(--r);
  border: 1px solid var(--line); background: linear-gradient(160deg, rgba(255,255,255,.11), rgba(255,255,255,.03));
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .6);
}
.chart__cap { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 6px; font-family: var(--f-display); font-weight: 600; font-size: .95rem; }
.chart__cap small { font-family: var(--f-body); font-weight: 600; font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.6); }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart__grid path { stroke: rgba(255,255,255,.1); stroke-width: 1; fill: none; }
.chart__split { stroke: rgba(255,255,255,.4); stroke-width: 1.2; stroke-dasharray: 3 5; }
.chart__tag { font-family: var(--f-display); font-size: 10.5px; font-weight: 600; letter-spacing: .14em; fill: var(--cyan); }
.chart__tag--f { fill: var(--lime); }
.chart__area { fill: url(#gArea); }
.chart__band { fill: url(#gBand); }
.chart__line { fill: none; stroke: url(#gLine); stroke-width: 3.5; stroke-linecap: round; }
.chart__fore { fill: none; stroke: var(--lime); stroke-width: 3.5; stroke-linecap: round; stroke-dasharray: 2 9; }
.chart__dots circle { fill: var(--bg); stroke: var(--cyan); stroke-width: 2.5; }
.chart__end { fill: var(--lime); filter: drop-shadow(0 0 10px var(--lime)); }
.chart__reveal { transform-box: fill-box; transform-origin: left center; transform: scaleX(0); }
.chart.is-in .chart__reveal { animation: chartReveal 2.6s .3s var(--ease) forwards; }
@keyframes chartReveal { to { transform: scaleX(1); } }

/* steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: clamp(48px, 7vw, 96px); position: relative; counter-reset: s; }
.steps::before {
  content: ""; position: absolute; left: 6%; right: 6%; top: 46px; height: 2px; z-index: -1;
  background: repeating-linear-gradient(90deg, rgba(255,255,255,.35) 0 8px, transparent 8px 16px);
}
.steps::after {
  content: ""; position: absolute; top: 41px; left: 6%; width: 12px; height: 12px; border-radius: 50%; z-index: -1;
  background: var(--lime); box-shadow: 0 0 18px 4px rgba(180,240,58,.7); animation: travel 7s linear infinite;
}
@keyframes travel { 0% { left: 6%; opacity: 0; } 8% { opacity: 1; } 92% { opacity: 1; } 100% { left: 94%; opacity: 0; } }
.step {
  position: relative; padding: 24px 22px 26px; border-radius: var(--r);
  border: 1px solid var(--line); background: linear-gradient(170deg, rgba(10, 40, 30, .85), rgba(6, 22, 24, .85));
  transition: transform .4s var(--ease), border-color .4s, box-shadow .4s;
}
.step:hover { transform: translateY(-6px); border-color: rgba(180,240,58,.6); box-shadow: 0 24px 50px -24px rgba(180,240,58,.35); }
.step__n { position: absolute; right: 20px; top: 20px; font-family: var(--f-display); font-size: 12px; font-weight: 600; letter-spacing: .1em; color: rgba(255,255,255,.45); }
.step__ico {
  width: 64px; height: 64px; padding: 15px; margin-bottom: 22px; border-radius: 20px;
  fill: none; stroke: #04140e; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
  background: var(--grad); box-shadow: 0 10px 30px -10px rgba(88, 214, 255, .6);
}
.step h3 { font-family: var(--f-display); font-size: 1.02rem; font-weight: 500; line-height: 1.35; }

/* ---------- program ---------- */
.program__lead { max-width: 52em; font-size: clamp(1.1rem, 1.7vw, 1.4rem); line-height: 1.6; color: var(--ink); margin-bottom: clamp(30px, 4vw, 52px); font-weight: 500; }

.orgs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.org {
  position: relative; display: flex; flex-direction: column; padding: 18px 18px 22px; border-radius: var(--r);
  background: #fff; border: 1px solid rgba(10, 40, 80, .08);
  box-shadow: 0 1px 0 rgba(255,255,255,.8) inset, 0 18px 40px -26px rgba(10, 50, 90, .35);
  transition: transform .4s var(--ease), box-shadow .4s, border-color .4s;
  overflow: hidden;
}
.org::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .5s var(--ease); }
.org:hover { transform: translateY(-6px); box-shadow: 0 30px 50px -26px rgba(20, 80, 160, .45); }
.org:hover::after { transform: scaleX(1); }
.org__n { position: absolute; right: 18px; top: 14px; font-family: var(--f-display); font-size: 11.5px; font-weight: 600; letter-spacing: .1em; color: rgba(10, 31, 46, .35); z-index: 1; }
.org__logo { height: 96px; display: grid; place-items: center; padding: 8px 4px 6px; margin-bottom: 14px; border-bottom: 1px dashed rgba(10, 40, 80, .14); }
.org__logo img { max-height: 76px; max-width: 100%; width: auto; object-fit: contain; }
.org h3 { font-family: var(--f-display); font-size: .98rem; font-weight: 600; line-height: 1.35; }
.org h3 small { font-family: var(--f-body); font-size: .82em; font-weight: 600; color: var(--ink-2); }
.org p { margin-top: auto; padding-top: 12px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.org--soon {
  grid-column: span 1; justify-content: center; align-items: flex-start; gap: 14px; color: #fff; border: none;
  background: linear-gradient(140deg, var(--deep), var(--blue) 55%, #1c9fd9);
}
.org--soon .ico { width: 38px; height: 38px; color: var(--lime); animation: tick 6s steps(12) infinite; }
@keyframes tick { to { transform: rotate(360deg); } }
.org--soon h3 { font-size: .98rem; line-height: 1.4; }
.org--soon::after { display: none; }

/* ---------- speakers ---------- */
.speakers__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.speaker {
  position: relative; display: flex; flex-direction: column; border-radius: var(--r); overflow: hidden;
  border: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
  transition: transform .45s var(--ease), border-color .45s, box-shadow .45s;
}
.speaker:hover { transform: translateY(-8px); border-color: rgba(88, 214, 255, .7); box-shadow: 0 30px 60px -26px rgba(38, 86, 255, .7), 0 0 0 1px rgba(88,214,255,.25); }
.speaker__photo { position: relative; aspect-ratio: 4 / 5; overflow: hidden; background: #0b2430; }
.speaker__photo > img { width: 100%; height: 100%; object-fit: cover; transition: transform .9s var(--ease), filter .6s; filter: saturate(.92); }
.speaker:hover .speaker__photo > img { transform: scale(1.06); filter: saturate(1.08); }
.speaker__photo::after { content: ""; position: absolute; inset: auto 0 0 0; height: 45%; background: linear-gradient(180deg, transparent, rgba(4, 20, 14, .75)); pointer-events: none; }
.speaker__body { display: flex; flex-direction: column; flex: 1; padding: 20px 20px 22px; }
.speaker h3 { font-family: var(--f-display); font-weight: 600; font-size: 1.02rem; line-height: 1.3; margin-bottom: 10px; }
.speaker p { font-size: 14.5px; line-height: 1.55; color: rgba(255,255,255,.76); }
.speaker__city {
  align-self: flex-start; margin-top: auto; padding: 6px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 700; color: var(--lime);
  border: 1px solid rgba(180, 240, 58, .4); background: rgba(180, 240, 58, .08);
}
.speaker__body p + .speaker__city { margin-top: 16px; }

/* ---------- organizers ---------- */
.organizers__main { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.organizers__main li {
  position: relative; display: grid; place-items: center; min-height: clamp(150px, 18vw, 220px); padding: clamp(22px, 4vw, 44px);
  border-radius: calc(var(--r) + 6px); background: #fff; border: 1px solid rgba(10,40,80,.08);
  box-shadow: 0 30px 70px -40px rgba(20, 70, 150, .5); overflow: hidden;
  transition: transform .4s var(--ease), box-shadow .4s;
}
.organizers__main li::before {
  content: ""; position: absolute; inset: 0; background: radial-gradient(60% 120% at 100% 0, rgba(88,214,255,.2), transparent 60%), radial-gradient(50% 100% at 0 100%, rgba(180,240,58,.18), transparent 60%);
}
.organizers__main li:hover { transform: translateY(-5px); box-shadow: 0 36px 70px -36px rgba(20, 80, 160, .55); }
.organizers__main img { position: relative; max-width: 100%; max-height: clamp(70px, 9vw, 130px); width: auto; height: auto; object-fit: contain; }
.organizers__sub--first { margin-top: 0; }
.organizers__sub { margin: clamp(34px, 5vw, 56px) 0 18px; font-family: var(--f-display); font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--blue); }
.partners { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; --cols: 4; }
.partners li {
  flex: 0 0 calc((100% - 16px * (var(--cols) - 1)) / var(--cols));
  display: grid; place-items: center; height: 120px; padding: 18px 26px; border-radius: 20px; background: #fff; border: 1px solid rgba(10,40,80,.08);
  transition: transform .4s var(--ease), box-shadow .4s;
}
.partners li:hover { transform: translateY(-5px); box-shadow: 0 24px 40px -26px rgba(20, 80, 160, .5); }
.partners img { max-height: 70px; max-width: 100%; width: auto; object-fit: contain; filter: grayscale(1) opacity(.7); transition: filter .4s; }
.partners li:hover img { filter: none; }

/* ---------- registration ---------- */
.registration { background: var(--bg); color: #fff; }
.registration__bg {
  position: absolute; inset: 0; z-index: -2;
  background: linear-gradient(180deg, var(--paper) 0, transparent 1px), url("../assets/img/hero-bg-sm.jpg") 30% 70% / cover no-repeat;
  filter: saturate(1.1);
}
.registration::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, rgba(4,20,14,.9) 0%, rgba(4,20,14,.55) 35%, rgba(4,20,14,.62) 70%, rgba(4,20,14,.95) 100%);
}
.reg__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: stretch; }
.card {
  position: relative; padding: clamp(22px, 3vw, 40px); border-radius: calc(var(--r) + 6px);
  border: 1px solid rgba(255,255,255,.22); background: linear-gradient(160deg, rgba(255,255,255,.16), rgba(255,255,255,.05));
  -webkit-backdrop-filter: blur(22px) saturate(1.3); backdrop-filter: blur(22px) saturate(1.3);
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, .7);
}
.card__tag { display: inline-block; margin-bottom: 14px; padding: 6px 14px; border-radius: 999px; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: #04140e; background: var(--lime); }
.card__tag--b { background: var(--cyan); }
.card__title { font-family: var(--f-display); font-weight: 600; font-size: clamp(1.2rem, 2vw, 1.6rem); line-height: 1.25; margin-bottom: 26px; }

.linkcard { display: flex; flex-direction: column; align-items: flex-start; }
.linkcard .card__title { margin-bottom: 20px; }
.linkcard__logo { width: 100%; height: 170px; display: grid; place-items: center; padding: 18px; border-radius: 20px; background: #fff; margin-bottom: 22px; }
.linkcard__logo img { max-height: 120px; max-width: 80%; width: auto; height: auto; object-fit: contain; }
.linkcard__text { color: rgba(255,255,255,.85); margin-bottom: 8px; font-weight: 600; }
.linkcard__link { display: block; margin-bottom: 24px; word-break: break-all; color: var(--cyan); font-weight: 700; font-size: 15px; text-decoration-thickness: 1.5px; text-underline-offset: 4px; }
.linkcard__link:hover { color: var(--lime); }
.linkcard .btn { margin-top: auto; }

/* ---------- contacts ---------- */
.contacts__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.person {
  display: flex; gap: 24px; align-items: flex-start; padding: clamp(22px, 3vw, 36px); border-radius: var(--r);
  border: 1px solid var(--line); background: linear-gradient(160deg, rgba(255,255,255,.09), rgba(255,255,255,.02));
  transition: border-color .4s, transform .4s var(--ease);
}
.person:hover { border-color: rgba(180,240,58,.55); transform: translateY(-4px); }
.person__ava {
  flex: none; width: 76px; height: 76px; display: grid; place-items: center; border-radius: 24px;
  font-family: var(--f-display); font-weight: 600; font-size: 1.4rem; color: #04140e; background: linear-gradient(135deg, var(--lime), #5fd35a);
}
.person__ava--b { background: linear-gradient(135deg, var(--cyan), #6f8bff); }
.person__topic { display: inline-block; margin-bottom: 12px; padding: 6px 14px; border-radius: 14px; font-size: 12px; line-height: 1.35; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: #04140e; background: var(--lime); }
.person:nth-child(2) .person__topic { background: var(--cyan); }
.person h3 { font-family: var(--f-display); font-weight: 600; font-size: 1.15rem; line-height: 1.3; margin-bottom: 8px; }
.person p { color: rgba(255,255,255,.72); font-size: 15px; margin-bottom: 18px; }
.person a { display: flex; align-items: center; gap: 10px; width: fit-content; max-width: 100%; margin-top: 8px; text-decoration: none; font-weight: 700; font-size: 16px; overflow-wrap: anywhere; transition: color .2s; }
.person a .ico { color: var(--cyan); }
.person a:hover { color: var(--lime); }

/* ---------- footer ---------- */
.footer { background: #020b07; border-top: 1px solid var(--line); padding-block: 36px; }
.footer__in { display: flex; align-items: center; gap: 28px; }
.footer img { height: 48px; width: auto; filter: brightness(0) invert(1); opacity: .9; }
.footer p { flex: 1; font-size: 13.5px; color: rgba(255,255,255,.55); line-height: 1.55; max-width: 60em; }
.footer__up { flex: none; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--line); transition: all .3s; }
.footer__up .ico { width: 22px; height: 22px; }
.footer__up:hover { background: var(--lime); color: #04140e; transform: translateY(-4px); }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .orgs { grid-template-columns: repeat(3, 1fr); }
  .speakers__grid { grid-template-columns: repeat(3, 1fr); }
  .partners { --cols: 3; }
}

@media (max-width: 1020px) {
  .burger { display: block; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    padding: 10px var(--gutter) 26px; background: rgba(4, 20, 14, .96);
    -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; visibility: hidden; transition: transform .3s var(--ease), opacity .3s, visibility .3s;
  }
  .nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav a:not(.btn) { padding: 16px 0; font-size: 14px; border-bottom: 1px solid var(--line); }
  .nav a:not(.btn)::after { display: none; }
  .nav__cta { margin: 18px 0 0; --pad-y: 15px; }
  .site-header.menu-open { background: rgba(4, 20, 14, .96); }

  .about__grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps::before, .steps::after { display: none; }
  .reg__grid, .contacts__grid { grid-template-columns: 1fr; }
  .hero { justify-content: flex-start; }
  .hero__in { margin-bottom: auto; }
  .hero__bg { background-position: 68% center; }
  .hero__shade { background:
    linear-gradient(90deg, rgba(3,18,11,.9) 0%, rgba(3,18,11,.7) 55%, rgba(3,18,11,.25) 100%),
    linear-gradient(180deg, rgba(3,18,11,.55) 0%, rgba(3,18,11,0) 24%, rgba(3,18,11,0) 66%, var(--bg) 100%); }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  :root { --header-h: 66px; }
  .brand img { height: 38px; }
  .orgs, .speakers__grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .partners { --cols: 2; }
  .organizers__main { grid-template-columns: 1fr; }
  .org--soon { grid-column: 1 / -1; }
  .hero__cta .btn { width: 100%; }
  .fact, .countdown { flex: 1 1 100%; }
  .countdown { justify-content: space-between; }
  .footer__in { flex-wrap: wrap; }
  .footer p { flex: 1 1 100%; order: 3; }
  .speaker__body { padding: 16px 14px 18px; }
  .speaker h3 { font-size: .9rem; }
  .speaker p { font-size: 13px; }
}

@media (max-width: 520px) {
  .steps { grid-template-columns: 1fr; }
  .speakers__grid { grid-template-columns: 1fr; }
  .speaker { flex-direction: column; }
  .speaker p { font-size: 14.5px; }
  .speaker h3 { font-size: 1rem; }
  .orgs { grid-template-columns: 1fr; }
  .person { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .chart__reveal { transform: none; }
}