/* =====================================================================
   САМОЛЁТ · База: сброс, типографика, сетка, фон, служебные классы
   ===================================================================== */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text-2);
  font-family:var(--font-text);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  font-feature-settings:"kern" 1,"liga" 1,"tnum" 0;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

img,video,canvas,svg{display:block;max-width:100%}
img{height:auto}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--text);
  font-weight:700;
  letter-spacing:var(--tracking-display);
  margin:0;
  text-wrap:balance;
}
h1{font-size:var(--fs-h1);line-height:var(--lh-tight)}
h2{font-size:var(--fs-h2);line-height:var(--lh-head)}
h3{font-size:var(--fs-h3);line-height:1.24;letter-spacing:-.01em}
h4{font-size:17px;line-height:1.3;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--accent);color:#fff}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}

/* ---------- Сетка ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,32px)}
section{padding:var(--sec-pad) 0;position:relative}
/* Секции полупрозрачны — сквозь них просвечивает 3D-фон с частицами.
   Карточки и панели внутри остаются плотными, чтобы текст читался. */
section.alt{background:rgba(255,255,255,.020)}

/* ---------- Типографические утилиты ---------- */
.lead{font-size:var(--fs-lead);line-height:1.6;color:var(--text-2)}
.lead.sub{max-width:62ch;margin-top:var(--s3)}
.cap{font-size:var(--fs-cap);line-height:1.5;color:var(--text-3)}
.eyebrow{
  font-size:11px;font-weight:600;letter-spacing:var(--tracking-caps);
  text-transform:uppercase;color:var(--accent);
}
.grad-text{
  background:var(--logo-grad-x);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
}

/* ---------- Шапка секции ---------- */
.sec-head{display:grid;grid-template-columns:auto 1fr;gap:var(--s4);align-items:start;margin-bottom:var(--s5)}
.snum{
  font-family:var(--font-display);font-size:clamp(30px,4vw,54px);line-height:.9;
  background:var(--logo-grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  opacity:.85;padding-top:4px;
}
@media (max-width:640px){
  .sec-head{grid-template-columns:1fr;gap:var(--s2)}
}

/* ---------- Фоновая атмосфера ---------- */
.bg-fx{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-fx b{
  position:absolute;display:block;border-radius:50%;filter:blur(90px);
  will-change:transform;
}
.bg-fx .b1{width:60vw;height:60vw;left:-18vw;top:-14vw;background:radial-gradient(circle,rgba(34,113,179,.30),transparent 68%)}
.bg-fx .b2{width:46vw;height:46vw;right:-12vw;top:32vh;background:radial-gradient(circle,rgba(163,0,125,.16),transparent 66%)}
.bg-fx .b3{width:52vw;height:52vw;left:14vw;bottom:-22vw;background:radial-gradient(circle,rgba(0,198,232,.12),transparent 68%)}
.bg-fx .grid{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:74px 74px;
  mask-image:radial-gradient(ellipse 70% 55% at 50% 30%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 70% 55% at 50% 30%,#000 20%,transparent 78%);
}
.bg-fx .noise{
  position:absolute;inset:0;opacity:.16;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}
#scene3d{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
.wrap,header,section,footer,.ticker{position:relative;z-index:1}

/* ---------- Появление при скролле ---------- */
.rv{opacity:0;transform:translateY(22px);transition:opacity var(--t-slow),transform var(--t-slow)}
.rv.in{opacity:1;transform:none}
html:not(.js) .rv{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none}}

/* ---------- Служебное ---------- */
[hidden]{display:none!important}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}