/* ═══════════════════════════════════════════════════════════
   НЭНТ · NLB — design tokens, base, components
   Tone system: light-grey bands alternating with white ones,
   deep-graphite footer. Header re-tints itself from the section
   under it.
   ═══════════════════════════════════════════════════════════ */

:root{
  /* NLB palette per «Наполнение сайта»: technological white / light grey / neon green.
     Tone names are kept from the shared markup: data-tone="dark" = light-grey band,
     data-tone="light" = white band. Only the footer stays deep graphite. */

  /* ---- "dark" tone → light grey ---- */
  --navy:#EDF1EF;
  --navy-2:#E5EBE8;
  --navy-3:#DBE3DF;
  --ink:#0C1310;          /* footer */
  --navy-rgb:237,241,239;

  /* ---- "light" tone → white ---- */
  --cream:#FFFFFF;
  --cream-2:#F6F8F7;
  --cream-3:#EDF1EF;
  --surface:#FFFFFF;

  /* ---- brand ---- */
  --electric:#087A44;     /* deep green: CTA fill + accent text (5.4:1 on white) */
  --electric-600:#06663A;
  --electric-rgb:8,122,68;
  --cyan:#087A44;         /* accent text on grey bands */
  --cyan-2:#5BE8A0;
  --cyan-rgb:16,185,100;  /* borders, washes */
  --ice:#065F36;          /* emphasised figures */
  --ice-rgb:15,23,21;     /* line-art strokes */
  --neon:#2BF58A;         /* glows, fills, bars — never body text */
  --neon-rgb:43,245,138;
  --ember:#FF6B3D;        /* problem side / heat */
  --ember-soft:#FFE3D8;

  /* ---- text on white ---- */
  --text:#0F1715;
  --muted:rgba(15,23,21,.72);
  --faint:rgba(15,23,21,.52);
  --line:rgba(15,23,21,.10);
  --line-2:rgba(15,23,21,.18);

  /* ---- text on light-grey bands (the former dark tone) ---- */
  --d-text:#0F1715;
  --d-text-rgb:15,23,21;
  --d-muted:rgba(15,23,21,.72);
  --d-faint:rgba(15,23,21,.52);
  --d-line:rgba(15,23,21,.10);
  --d-line-2:rgba(15,23,21,.18);
  --d-card:rgba(255,255,255,.72);
  --grid-rgb:15,23,21;

  /* ---- type ---- */
  --f-display:'Tektur','Arial Narrow',system-ui,sans-serif;  /* used at font-stretch 87.5% */
  --f-body:'Manrope',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,monospace;

  --fs-display:clamp(38px,3.1vw + 18px,78px);
  --fs-h2:clamp(28px,2.3vw + 10px,50px);
  --fs-h3:clamp(18px,.55vw + 13px,23px);
  --fs-lead:clamp(17px,.55vw + 12px,21px);
  --fs-body:clamp(15.5px,.35vw + 13px,17.5px);
  --fs-eyebrow:clamp(11px,.16vw + 10px,13px);

  /* ---- layout ---- */
  --wrap:min(92vw,1240px);
  --gut:clamp(18px,3vw,44px);
  --sec-y:clamp(64px,7vw,132px);
  --r:16px;
  --r-lg:24px;
  --pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.19,1,.22,1);
  --hdr-h:74px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html:not(.lenis) {scroll-behavior:smooth}
body{
  margin:0;background:var(--cream);color:var(--text);
  font-family:var(--f-body);font-size:var(--fs-body);line-height:1.62;
  font-weight:450;letter-spacing:-.005em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
  font-stretch:87.5%; /* only Tektur has a width axis; Manrope and JetBrains Mono ignore it */
}
img,svg,canvas{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure,fieldset{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
table{border-collapse:collapse;width:100%}

/* Lenis smooth scroll */
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto !important}
.lenis.lenis-stopped{overflow:hidden}

.ico{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px;top:0;z-index:200;background:var(--electric);color:#fff;padding:12px 18px;border-radius:0 0 10px 0}
.skip:focus{left:0}

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

.wrap{width:var(--wrap);margin-inline:auto}

/* ─────────────── typography ─────────────── */
.h2{
  font-family:var(--f-display);font-weight:600;
  font-size:var(--fs-h2);line-height:1.03;letter-spacing:-.012em;
  text-transform:uppercase;max-width:28ch;
}
.h2--sm{font-size:clamp(24px,1.5vw + 13px,36px);max-width:32ch}
.h3{
  font-family:var(--f-display);font-weight:600;text-transform:uppercase;
  font-size:clamp(20px,1vw + 14px,30px);line-height:1.1;letter-spacing:-.008em;
}
.lead{font-size:var(--fs-lead);line-height:1.55;max-width:62ch;color:var(--muted);font-weight:450}
[data-tone="dark"] .lead{color:var(--d-muted)}

.eyebrow{
  font-family:var(--f-mono);font-size:var(--fs-eyebrow);font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--electric);
  display:flex;align-items:center;gap:12px;line-height:1.4;
}
[data-tone="dark"] .eyebrow{color:var(--cyan)}
.eyebrow .rule{width:clamp(20px,3vw,44px);height:1px;background:currentColor;opacity:.6;flex:none}

.shead{margin-bottom:clamp(34px,4vw,60px);display:grid;gap:16px}
.shead .h2{margin-top:2px}

/* ─────────────── buttons ─────────────── */
.btn{
  --bg:var(--electric);--fg:#fff;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 26px;border-radius:var(--pill);border:1px solid transparent;
  background:var(--bg);color:var(--fg);cursor:pointer;
  font-weight:700;font-size:15.5px;letter-spacing:-.01em;line-height:1;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),background .22s,border-color .22s,color .22s;
  will-change:transform;text-align:center;
}
.btn .ar{transition:transform .3s var(--ease-out);display:inline-block}
.btn:hover{transform:translateY(-2px)}
.btn:hover .ar{transform:translateX(4px)}
.btn:active{transform:translateY(0)}
.btn--primary{box-shadow:0 10px 30px -14px rgba(var(--electric-rgb),.8),0 0 0 0 rgba(var(--neon-rgb),.4)}
.btn--primary:hover{background:var(--electric-600);box-shadow:0 16px 40px -14px rgba(var(--electric-rgb),.9),0 0 0 6px rgba(var(--neon-rgb),.28)}
.btn--ghost{background:transparent;border-color:var(--d-line-2);color:var(--d-text)}
.btn--ghost:hover{border-color:var(--electric);background:rgba(var(--neon-rgb),.12)}
[data-tone="light"] .btn--ghost{border-color:var(--line-2);color:var(--text)}
[data-tone="light"] .btn--ghost:hover{border-color:var(--electric);background:rgba(var(--neon-rgb),.12)}
.btn--sm{padding:11px 20px;font-size:14.5px}
.btn--full{width:100%}

/* ─────────────── header ─────────────── */
.hdr{
  position:fixed;inset:0 0 auto 0;z-index:90;
  transition:background .35s var(--ease),border-color .35s,backdrop-filter .35s;
  border-bottom:1px solid transparent;
}
.hdr__in{
  width:var(--wrap);margin-inline:auto;min-height:var(--hdr-h);
  display:flex;align-items:center;gap:clamp(14px,3vw,40px);
}
.hdr.is-scrolled{backdrop-filter:saturate(140%) blur(14px);-webkit-backdrop-filter:saturate(140%) blur(14px)}
.hdr[data-tone="dark"].is-scrolled{background:rgba(var(--navy-rgb),.88);border-bottom-color:var(--d-line)}
.hdr[data-tone="light"].is-scrolled{background:rgba(255,255,255,.88);border-bottom-color:var(--line)}

.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand__mark{display:block;width:40px;height:40px;flex:none}
.brand__mark svg{width:100%;height:100%;display:block}
.brand__txt{display:grid;line-height:1.1}
.brand__txt b{font-family:var(--f-display);font-weight:700;font-size:19px;letter-spacing:.08em;white-space:nowrap}
.brand__txt i{font-family:var(--f-mono);font-style:normal;font-size:10px;letter-spacing:.14em;opacity:.6;text-transform:uppercase}
.hdr[data-tone="dark"] .brand{color:var(--d-text)}
.hdr[data-tone="light"] .brand{color:var(--text)}

.nav{display:flex;gap:clamp(12px,1.6vw,26px);margin-left:auto;font-size:15px;font-weight:550}
.nav a{position:relative;padding:6px 0;transition:color .22s;white-space:nowrap}
.hdr[data-tone="dark"] .nav a{color:var(--d-muted)}
.hdr[data-tone="light"] .nav a{color:var(--muted)}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1.5px;background:currentColor;transition:right .3s var(--ease-out);opacity:.7}
.nav a:hover::after{right:0}
.hdr[data-tone="dark"] .nav a:hover{color:var(--electric)}
.hdr[data-tone="light"] .nav a:hover{color:var(--electric)}
.nav a[aria-current="page"]::after{right:0}
.hdr[data-tone="dark"] .nav a[aria-current="page"]{color:var(--d-text)}
.hdr[data-tone="light"] .nav a[aria-current="page"]{color:var(--text)}

.hdr__cta{margin-left:auto;display:flex;align-items:center;gap:10px}
.nav + .hdr__cta{margin-left:clamp(12px,2vw,28px)}

.burger{display:none;width:42px;height:42px;border:1px solid var(--d-line-2);background:none;border-radius:12px;position:relative;cursor:pointer}
.hdr[data-tone="light"] .burger{border-color:var(--line-2)}
.burger span,.burger::before,.burger::after{content:"";position:absolute;left:11px;right:11px;height:1.8px;background:currentColor;border-radius:2px;transition:transform .3s var(--ease),opacity .2s}
.hdr[data-tone="dark"] .burger{color:var(--d-text)} .hdr[data-tone="light"] .burger{color:var(--text)}
.burger span{top:calc(50% - .9px)} .burger::before{top:13px} .burger::after{bottom:13px}
.burger.is-open span{opacity:0}
.burger.is-open::before{transform:translateY(7px) rotate(45deg)}
.burger.is-open::after{transform:translateY(-7px) rotate(-45deg)}

.drawer{
  position:fixed;inset:var(--hdr-h) 0 0 0;z-index:85;
  background:rgba(var(--navy-rgb),.97);backdrop-filter:blur(18px);
  display:none;flex-direction:column;gap:4px;padding:26px var(--gut) 40px;
  overflow-y:auto;
}
.drawer.is-open{display:flex}
.drawer a{color:var(--d-text);font-family:var(--f-display);font-size:24px;text-transform:uppercase;padding:11px 0;border-bottom:1px solid var(--d-line)}
.drawer .btn{margin-top:20px;font-family:var(--f-body);text-transform:none;font-size:16px;border-bottom:0}

/* ─────────────── section tones ─────────────── */
.section{position:relative;padding-block:var(--sec-y);isolation:isolate;overflow-x:clip}
.section[data-tone="dark"]{background:var(--navy);color:var(--d-text)}
.section[data-tone="light"]{background:var(--cream);color:var(--text)}
.section[data-tone="dark"] + .section[data-tone="light"],
.section[data-tone="light"] + .section[data-tone="dark"]{border-top:0}

/* ambient glows on dark sections */
.glow{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none;z-index:-1;opacity:.5}
.glow--a{width:min(56vw,700px);aspect-ratio:1;top:-8%;right:-14%;background:radial-gradient(circle,rgba(var(--neon-rgb),.30),transparent 68%)}
.glow--b{width:min(44vw,540px);aspect-ratio:1;bottom:-14%;left:-12%;background:radial-gradient(circle,rgba(var(--cyan-rgb),.18),transparent 70%)}
.glow--c{width:min(50vw,640px);aspect-ratio:1;top:10%;left:-16%;background:radial-gradient(circle,rgba(var(--neon-rgb),.26),transparent 70%)}
.glow--d{width:min(52vw,660px);aspect-ratio:1;bottom:-10%;right:-16%;background:radial-gradient(circle,rgba(var(--cyan-rgb),.2),transparent 70%)}

/* ─────────────── reveal system ─────────────── */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .78s var(--ease-out),transform .78s var(--ease-out)}
.reveal.is-in{opacity:1;transform:none}
.reveal:nth-child(2){transition-delay:.06s}
.reveal:nth-child(3){transition-delay:.12s}
.reveal:nth-child(4){transition-delay:.18s}
.reveal:nth-child(5){transition-delay:.24s}
.reveal:nth-child(6){transition-delay:.3s}

[data-reveal-lines]{overflow:hidden}
.rl-line{display:block;overflow:hidden}
.rl-inner{
  display:block;transform:translateY(112%);opacity:0;
  transition:transform .92s var(--ease-out),opacity .6s ease;
  transition-delay:var(--rl-delay,0s);
}
[data-reveal-lines].is-in .rl-inner{transform:none;opacity:1}

/* cursor spotlight on cards */
.spot{position:relative;overflow:hidden}
.spot::before{
  content:"";position:absolute;inset:-1px;pointer-events:none;opacity:0;
  transition:opacity .35s ease;z-index:0;
  background:radial-gradient(340px circle at var(--mx,50%) var(--my,50%),rgba(var(--neon-rgb),.22),transparent 62%);
}
[data-tone="light"] .spot::before{background:radial-gradient(340px circle at var(--mx,50%) var(--my,50%),rgba(var(--neon-rgb),.16),transparent 62%)}
.spot:hover::before{opacity:1}
.spot > *{position:relative;z-index:1}

/* ─────────────── footer ─────────────── */
.foot{
  /* the one dark band: local tokens flip back to light-on-graphite */
  --d-text:#E8F3EE;--d-muted:rgba(232,243,238,.72);--d-faint:rgba(232,243,238,.46);
  --d-line:rgba(var(--neon-rgb),.14);--cyan:#2BF58A;--ice:#B9FFD8;--cyan-rgb:43,245,138;
  background:var(--ink);color:var(--d-text);padding-block:clamp(48px,5vw,76px) 34px;border-top:1px solid var(--d-line);
}
.foot__in{display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(28px,4vw,64px)}
.foot__brand b{font-family:var(--f-display);font-size:20px;letter-spacing:.07em;display:block;margin-bottom:12px}
.foot__brand p{color:var(--d-muted);max-width:46ch;font-size:15px}
.foot__mail{margin-top:12px;font-family:var(--f-mono);font-size:14px}
.foot__nav{display:grid;grid-template-columns:1fr 1fr;gap:9px 24px;align-content:start;font-size:15px}
.foot__nav a{color:var(--d-muted);transition:color .2s}
.foot__nav a:hover{color:var(--neon)}
.foot__meta{grid-column:1/-1;border-top:1px solid var(--d-line);padding-top:24px;display:grid;gap:10px}
.foot__meta p{font-size:13px;color:var(--d-faint)}
.foot__disc{max-width:88ch;line-height:1.6}

/* ── кросс-ссылка на второй проект в футере ── */
.foot__cross{margin-top:14px;display:grid;gap:3px}
.foot__cross span{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--d-faint)}
.foot__cross a{font-size:15px;font-weight:650;display:inline-flex;align-items:center;gap:8px;width:fit-content;border-bottom-color:transparent}
.foot__cross a .ar{transition:transform .3s var(--ease-out)}
.foot__cross a:hover{border-bottom-color:currentColor}
.foot__cross a:hover .ar{transform:translateX(4px)}

/* ─────────────── responsive ─────────────── */
@media (max-width:980px){
  .nav{display:none}
  .burger{display:block}
  .foot__in{grid-template-columns:1fr}
  .foot__nav{grid-template-columns:1fr 1fr;max-width:420px}
}
@media (max-width:560px){
  .brand__txt i{display:none}
  .hdr__cta .btn--sm{display:none}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
  .rl-inner{transform:none;opacity:1}
}