/* ==========================================================================
   EliteBoard Player — тёмная ультрасовременная страница (i-p.pro/eliteboard)
   Айдентика приложения: navy→чёрный + синее свечение. Лёгкий, self-contained.
   Только GPU-свойства для анимаций. Без внешних зависимостей.
   ========================================================================== */
:root {
  --bg: #070b12;
  --bg-2: #0a1018;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-2: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --ink: #eaf1f8;
  --muted: #93a1b4;
  --muted-2: #64718526;
  --blue: #37b6f0;
  --blue-deep: #1f8fd6;
  --blue-soft: rgba(55, 182, 240, 0.14);
  --glow: rgba(55, 182, 240, 0.45);
  --r-xl: 30px;
  --r-lg: 22px;
  --r-md: 15px;
  --maxw: 1200px;
  --ease: cubic-bezier(0.16, 0.84, 0.24, 1);
}
* , *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; color: var(--ink);
  font-family: "SF Pro Display", "SF Pro Text", "Inter", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(1000px 600px at 78% -6%, rgba(55,182,240,0.16), transparent 60%),
    radial-gradient(760px 520px at 6% 8%, rgba(31,143,214,0.12), transparent 58%),
    linear-gradient(180deg, #070b12 0%, #080d15 45%, #060a10 100%);
  background-attachment: fixed;
  overflow-x: hidden; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.wrap { width: min(var(--maxw), calc(100% - 40px)); margin: 0 auto; }
h1,h2,h3 { margin: 0; letter-spacing: -0.03em; line-height: 1.04; }
.eyebrow { margin: 0 0 16px; color: var(--blue); font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase; }

/* ---- Прогресс + топбар ---- */
.progress { position: fixed; top: 0; left: 0; height: 2px; width: 100%; z-index: 60;
  transform: scaleX(var(--p,0)); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue-deep), var(--blue)); }
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  width: min(var(--maxw), calc(100% - 40px)); margin: 0 auto; padding: 16px 4px;
}
.topbar::before { content:""; position: absolute; inset: 0 -100vw; z-index: -1;
  background: rgba(7,11,18,0.6); backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  opacity: 0; transition: opacity .4s var(--ease); border-bottom: 1px solid transparent; }
.topbar.stuck::before { opacity: 1; border-bottom-color: var(--line); }
.tb-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.02em; }
.tb-brand .home { color: var(--muted); font-size: 0.92rem; transition: color .2s var(--ease); }
.tb-brand .home:hover { color: var(--ink); }
.tb-brand .sep { color: var(--muted-2); }
.tb-brand .cur { color: var(--ink); font-size: 0.95rem; }
.tb-nav { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 0.9rem; }
.tb-nav a { transition: color .2s var(--ease); }
.tb-nav a:hover { color: var(--ink); }
.tb-dl { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 999px;
  background: var(--blue); color: #05121c; font-weight: 600; font-size: 0.88rem;
  box-shadow: 0 6px 20px rgba(55,182,240,0.28); transition: transform .2s var(--ease), box-shadow .2s var(--ease); }
.tb-dl:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(55,182,240,0.4); }

/* ---- Кнопки ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 56px; padding: 0 28px; border-radius: 999px; cursor: pointer; border: 0;
  font-size: 1rem; font-weight: 600; transition: transform .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease); }
.btn-primary { background: linear-gradient(180deg, #45c0f6, var(--blue)); color: #04121b;
  box-shadow: 0 14px 40px rgba(55,182,240,0.34), inset 0 1px 0 rgba(255,255,255,0.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 54px rgba(55,182,240,0.5); }
.btn-primary .sz { font-weight: 400; opacity: .7; font-size: 0.86rem; }
.btn-ghost { background: var(--panel-2); color: var(--ink); border: 1px solid var(--line-strong); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--blue); }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero { position: relative; padding: clamp(40px, 8vh, 90px) 0 clamp(40px, 7vh, 80px); perspective: 1400px; }
.hero-grid { position: absolute; inset: 0 0 auto; height: 640px; z-index: 0; pointer-events: none;
  background-image: linear-gradient(rgba(120,170,210,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,170,210,0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(70% 60% at 60% 20%, #000 20%, transparent 76%);
  -webkit-mask-image: radial-gradient(70% 60% at 60% 20%, #000 20%, transparent 76%);
  transform: translateZ(-1px); }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.04fr 0.96fr;
  gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(3rem, 7vw, 5.6rem); font-weight: 700; }
.hero h1 .brand { color: #fff; }
.hero h1 .player { display: block; margin-top: 6px; font-size: 0.34em; font-weight: 600;
  letter-spacing: 0.42em; color: var(--blue); text-shadow: 0 0 24px var(--glow); }
.hero-lead { margin: 22px 0 0; color: var(--muted); font-size: clamp(1.04rem, 1.6vw, 1.2rem); line-height: 1.6; max-width: 46ch; }
.hero-lead b { color: var(--ink); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--panel); color: var(--muted); font-size: 0.84rem; }
.hero-meta .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 8px var(--glow); }

/* витрина иконки/устройства с 3D */
.hero-visual { position: relative; transform-style: preserve-3d; }
.icon-stage { position: relative; display: grid; place-items: center; padding: 30px; }
.icon-halo { position: absolute; width: 340px; height: 340px; border-radius: 50%; filter: blur(50px);
  background: radial-gradient(circle, rgba(55,182,240,0.45), transparent 68%); z-index: 0; will-change: transform; }
.app-icon { position: relative; z-index: 2; width: clamp(150px, 22vw, 210px); height: auto;
  border-radius: 30%; box-shadow: 0 40px 90px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.06); will-change: transform; }
.float-card { position: absolute; z-index: 3; display: flex; align-items: center; gap: 12px;
  padding: 13px 16px; border-radius: var(--r-md); background: rgba(12,20,30,0.82);
  border: 1px solid var(--line-strong); box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  backdrop-filter: blur(8px); will-change: transform; }
.float-card .ico { flex: 0 0 auto; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px;
  background: var(--blue-soft); color: var(--blue); }
.float-card > span:last-child { display: flex; flex-direction: column; gap: 3px; }
.float-card .k { font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); line-height: 1; }
.float-card .v { font-size: 0.94rem; font-weight: 600; line-height: 1; white-space: nowrap; }
.float-card.fc1 { left: -6px; top: 14%; }
.float-card.fc2 { right: -10px; bottom: 16%; }

/* ==========================================================================
   Секции / reveal
   ========================================================================== */
.section { padding: clamp(56px, 10vh, 110px) 0; position: relative; }
.section-head { max-width: 680px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(2rem, 4.4vw, 3.4rem); }
.section-head p { margin: 16px 0 0; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.12rem); line-height: 1.6; }
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1{transition-delay:.06s}.reveal.d2{transition-delay:.12s}.reveal.d3{transition-delay:.18s}
.reveal.d4{transition-delay:.24s}.reveal.d5{transition-delay:.3s}.reveal.d6{transition-delay:.36s}

/* ---- Возможности ---- */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feat { padding: 26px; border-radius: var(--r-lg); background: var(--panel);
  border: 1px solid var(--line); position: relative; overflow: hidden;
  transition: transform .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease); }
.feat:hover { transform: translateY(-4px); border-color: var(--line-strong); background: var(--panel-2); }
.feat::after { content:""; position: absolute; inset: 0; opacity: 0; transition: opacity .4s var(--ease);
  background: radial-gradient(300px 120px at 50% 0%, rgba(55,182,240,0.12), transparent 70%); }
.feat:hover::after { opacity: 1; }
.feat .fi { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 13px;
  margin-bottom: 18px; background: var(--blue-soft); color: var(--blue); border: 1px solid rgba(55,182,240,0.2); }
.feat h3 { font-size: 1.14rem; margin-bottom: 9px; letter-spacing: -0.02em; }
.feat p { margin: 0; color: var(--muted); font-size: 0.94rem; line-height: 1.55; }

/* ---- Как работает ---- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step { position: relative; padding: 30px; border-radius: var(--r-lg);
  background: linear-gradient(180deg, var(--panel-2), var(--panel)); border: 1px solid var(--line); }
.step .n { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 12px;
  margin-bottom: 20px; font-weight: 700; color: var(--blue);
  background: var(--blue-soft); border: 1px solid rgba(55,182,240,0.25); }
.step h3 { font-size: 1.2rem; margin-bottom: 10px; }
.step p { margin: 0; color: var(--muted); font-size: 0.96rem; line-height: 1.55; }
.step code { color: #bfe6fb; background: rgba(55,182,240,0.1); padding: 1px 7px; border-radius: 6px; font-size: 0.86em; }

/* ---- Скриншоты ---- */
.shots { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.shot { position: relative; border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--line-strong);
  background: #05090f; box-shadow: 0 30px 70px rgba(0,0,0,0.45); aspect-ratio: 40/18; will-change: transform; }
.shot img { width: 100%; height: 100%; object-fit: cover; }
.shot .cap { position: absolute; left: 14px; bottom: 12px; z-index: 2; padding: 7px 12px; border-radius: 999px;
  font-size: 0.8rem; color: var(--ink); background: rgba(6,12,20,0.7); border: 1px solid var(--line);
  backdrop-filter: blur(6px); }

/* ---- Требования (спека) ---- */
.spec-panel { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; overflow: hidden;
  border-radius: var(--r-lg); border: 1px solid var(--line); background: var(--line); }
.spec { background: var(--bg-2); padding: 26px 22px; }
.spec .k { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px; }
.spec .v { font-size: 1.16rem; font-weight: 600; letter-spacing: -0.02em; }
.spec .v small { display: block; color: var(--muted); font-size: 0.82rem; font-weight: 400; margin-top: 3px; letter-spacing: 0; }

/* ---- Финальный CTA ---- */
.cta { position: relative; overflow: hidden; text-align: center;
  padding: clamp(48px, 8vw, 84px) clamp(24px, 5vw, 70px);
  border-radius: var(--r-xl); border: 1px solid var(--line-strong);
  background: radial-gradient(700px 300px at 50% -20%, rgba(55,182,240,0.2), transparent 65%),
    linear-gradient(180deg, #0b1523, #080d15); }
.cta h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); max-width: 16ch; margin: 0 auto 16px; }
.cta p { color: var(--muted); max-width: 52ch; margin: 0 auto 30px; font-size: 1.06rem; line-height: 1.6; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---- Приватность ---- */
.privacy { max-width: 760px; }
.privacy p { color: var(--muted); font-size: 0.98rem; line-height: 1.7; margin: 0 0 14px; }
.privacy .box { padding: 26px; border-radius: var(--r-lg); background: var(--panel); border: 1px solid var(--line); }

/* ---- Footer ---- */
.footer { border-top: 1px solid var(--line); margin-top: 40px; }
.footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px;
  padding: 30px 4px 44px; color: var(--muted); font-size: 0.9rem; }
.footer a { color: var(--muted); transition: color .2s var(--ease); }
.footer a:hover { color: var(--blue); }

/* ---- Адаптив ---- */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; gap: 20px; }
  .hero-visual { order: -1; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .spec-panel { grid-template-columns: repeat(2, 1fr); }
  .float-card.fc1 { left: 4%; } .float-card.fc2 { right: 4%; }
}
@media (max-width: 620px) {
  .tb-nav { display: none; }
  .shots { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
  .spec-panel { grid-template-columns: 1fr; }
  .hero h1 { font-size: clamp(2.6rem, 13vw, 4rem); }
  .float-card { display: none; }
  .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .icon-halo, .app-icon, .float-card, .shot { transform: none !important; }
}