:root{
  --ink:#0F1116;
  --ink-2:#1A1E27;
  --paper:#F4EFE6;
  --paper-2:#EAE2D0;
  --text-light:#F4EFE6;
  --text-dark:#0F1116;
  --muted-light:#A7A398;
  --muted-dark:#6B6A5E;
  --amber:#E58B1B;
  --amber-bright:#F5A524;
  --amber-soft:#F7D08A;
  --grid-line:rgba(244,239,230,0.08);
  --grid-line-dark:rgba(15,17,22,0.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--ink);color:var(--text-light);
  font-family:'Manrope',system-ui,-apple-system,sans-serif;font-weight:400;line-height:1.55;
  -webkit-font-smoothing:antialiased;overflow-x:hidden
}
a{color:inherit;text-decoration:none}

/* ─── engineering header ─── */
.eng-header{position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 32px;
  background:linear-gradient(180deg,rgba(15,17,22,0.75) 0%,rgba(15,17,22,0) 100%);
  color:var(--text-light);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.eng-brand{display:flex;align-items:center;gap:12px}
.eng-brand-mark{width:32px;height:32px;border-radius:6px;
  background:linear-gradient(135deg,var(--amber-bright),var(--amber));
  box-shadow:0 4px 20px rgba(245,165,36,0.35),inset 0 -3px 0 rgba(0,0,0,0.15);
  position:relative}
.eng-brand-mark::after{content:"";position:absolute;inset:6px;border-radius:3px;
  background:repeating-linear-gradient(90deg,transparent 0,transparent 3px,rgba(0,0,0,0.25) 3px,rgba(0,0,0,0.25) 4px)}
.eng-brand-name{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:16px;letter-spacing:-0.01em;color:var(--paper)}
.eng-brand-name span{color:var(--amber-bright);margin:0 2px;font-weight:400}
.eng-brand-sub{font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:0.18em;color:var(--muted-light);text-transform:uppercase;margin-top:2px}

.eng-nav{display:flex;align-items:center;gap:28px}
.eng-nav a{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:0.14em;color:var(--muted-light);text-transform:uppercase;
  transition:color .2s}
.eng-nav a:hover{color:var(--amber-bright)}

/* ─── engineering кнопка: острая, с тонкой рамкой ─── */
.eng-btn{display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;border:1.5px solid var(--amber-bright);border-radius:4px;background:transparent;
  font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:14px;letter-spacing:0.02em;
  color:var(--amber-bright);cursor:pointer;
  transition:background .2s,color .2s,box-shadow .2s,transform .18s}
.eng-btn:hover{background:var(--amber-bright);color:var(--ink);
  box-shadow:0 12px 40px rgba(245,165,36,0.4);transform:translateY(-2px)}
.eng-btn--sm{padding:9px 16px;font-size:12px}
.eng-btn--lg{padding:20px 40px;font-size:16px;
  background:linear-gradient(135deg,var(--amber-bright),var(--amber));color:var(--ink);border-color:transparent;
  box-shadow:0 12px 40px rgba(245,165,36,0.35),inset 0 1px 0 rgba(255,255,255,0.25)}
.eng-btn--lg:hover{filter:brightness(1.08);box-shadow:0 18px 54px rgba(245,165,36,0.5)}

/* ─── slide ─── */
.slide{position:relative;width:100%;min-height:100svh;
  background-size:cover;background-position:center;background-repeat:no-repeat;overflow:hidden}
.slide--dark{color:var(--text-light)}
.slide--paper{color:var(--text-dark)}
.slide-shade{position:absolute;inset:0;pointer-events:none;z-index:1}
.slide-shade--dark{background:
  linear-gradient(180deg,rgba(15,17,22,0.6) 0%,rgba(15,17,22,0.15) 25%,rgba(15,17,22,0.15) 55%,rgba(15,17,22,0.85) 100%),
  radial-gradient(60% 55% at 50% 50%,rgba(0,0,0,0) 0%,rgba(0,0,0,0.35) 100%)}
.slide-shade--dark.slide-shade--strong{background:
  linear-gradient(180deg,rgba(15,17,22,0.75) 0%,rgba(15,17,22,0.35) 30%,rgba(15,17,22,0.9) 100%)}
.slide-shade--light{background:
  linear-gradient(180deg,rgba(244,239,230,0.7) 0%,rgba(244,239,230,0.25) 30%,rgba(244,239,230,0.25) 55%,rgba(244,239,230,0.9) 100%),
  radial-gradient(60% 55% at 50% 50%,rgba(244,239,230,0.1) 0%,rgba(244,239,230,0.4) 100%)}

/* engineering-сетка на фоне слайда — тонкие линии */
.slide::before{content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background-image:
    linear-gradient(to right,var(--grid-line) 1px,transparent 1px),
    linear-gradient(to bottom,var(--grid-line) 1px,transparent 1px);
  background-size:120px 120px}
.slide--paper::before{background-image:
    linear-gradient(to right,var(--grid-line-dark) 1px,transparent 1px),
    linear-gradient(to bottom,var(--grid-line-dark) 1px,transparent 1px)}

/* ─── grid слайда: meta / hero / side ─── */
.slide-grid{position:relative;z-index:3;
  display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto 1fr;
  gap:60px 80px;
  padding:120px 6vw 80px;min-height:100svh}
.slide-meta{grid-column:1 / -1;
  display:flex;justify-content:space-between;align-items:center;
  padding-bottom:20px;border-bottom:1px solid rgba(244,239,230,0.14)}
.slide-meta--dark{border-bottom-color:rgba(15,17,22,0.12)}
.slide-hero{align-self:end;max-width:640px}
.slide-hero--center{grid-column:1 / -1;text-align:center;margin:0 auto;max-width:820px;align-self:center}
.slide-side{align-self:end;display:flex;flex-direction:column;gap:24px}
.slide-grid--final{grid-template-columns:1fr;grid-template-rows:auto 1fr;justify-items:center;padding-top:130px}
.slide-grid--final .slide-meta{width:100%;max-width:820px}
.slide-grid--final .slide-hero{align-self:start}

/* ─── typography ─── */
.eng-tag{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:0.22em;color:var(--amber-bright);text-transform:uppercase}
.eng-tag--dark{color:var(--amber)}
.eng-coord{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:0.2em;color:var(--muted-light);text-transform:uppercase}
.eng-coord--dark{color:var(--muted-dark)}

.eng-h1{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(38px,4.8vw,72px);
  letter-spacing:-0.025em;line-height:1.03;color:var(--paper);
  text-shadow:0 4px 40px rgba(0,0,0,0.5)}
.eng-h{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(34px,4.4vw,64px);
  letter-spacing:-0.025em;line-height:1.05;color:var(--paper);
  text-shadow:0 4px 40px rgba(0,0,0,0.5)}
.eng-h--dark{color:var(--ink);text-shadow:0 4px 40px rgba(255,255,255,0.55)}
.eng-h--big{font-size:clamp(44px,5.6vw,88px)}
.eng-h em, .eng-h1 em{font-style:italic;font-weight:500;color:var(--amber-bright);letter-spacing:-0.01em}
.eng-h--dark em{color:var(--amber)}

.eng-lead{margin-top:24px;font-family:'Manrope',sans-serif;font-weight:400;
  font-size:clamp(15px,1.15vw,18px);line-height:1.6;color:var(--paper);opacity:0.9;
  text-shadow:0 2px 20px rgba(0,0,0,0.55);max-width:56ch}
.eng-lead--dark{color:var(--ink);opacity:0.82;text-shadow:0 2px 20px rgba(255,255,255,0.5)}

/* ─── datum-карточка (engineering readout) ─── */
.eng-datum{padding:24px 26px;border:1px solid rgba(244,239,230,0.18);border-radius:6px;
  background:rgba(15,17,22,0.55);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.eng-datum--dark{background:rgba(244,239,230,0.85);border-color:rgba(15,17,22,0.12)}
.eng-datum--big{padding:34px 30px}
.eng-datum-label{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:0.2em;color:var(--muted-light);text-transform:uppercase;margin-bottom:12px}
.eng-datum--dark .eng-datum-label{color:var(--muted-dark)}
.eng-datum-num{font-family:'Space Grotesk',sans-serif;font-weight:700;
  font-size:clamp(38px,4vw,56px);letter-spacing:-0.03em;line-height:1;color:var(--amber-bright)}
.eng-datum--dark .eng-datum-num{color:var(--amber)}
.eng-datum-num--xl{font-size:clamp(52px,5.2vw,80px)}
.eng-datum-num span{font-family:'JetBrains Mono',monospace;font-size:0.28em;font-weight:500;
  color:var(--muted-light);letter-spacing:0.1em;margin-left:10px;text-transform:uppercase;vertical-align:middle}
.eng-datum--dark .eng-datum-num span{color:var(--muted-dark)}

/* ─── steps как схема процесса ─── */
.eng-steps{list-style:none;display:flex;flex-direction:column;gap:14px;
  padding:26px 28px;border:1px solid rgba(244,239,230,0.18);border-radius:6px;
  background:rgba(15,17,22,0.55);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.eng-steps li{font-family:'Manrope',sans-serif;font-size:15px;color:var(--paper);
  display:flex;align-items:center;gap:14px;padding:6px 0}
.eng-steps li span{font-family:'JetBrains Mono',monospace;font-size:11px;font-weight:600;
  color:var(--amber-bright);border:1px solid rgba(245,165,36,0.4);padding:4px 8px;border-radius:3px;letter-spacing:0.08em;flex-shrink:0}
.eng-steps li em{font-style:normal;color:var(--amber-bright);font-family:'JetBrains Mono',monospace;font-size:12px;margin-left:auto}

/* ─── финальная нижняя лента ─── */
.eng-final-strip{margin-top:44px;display:flex;justify-content:center;gap:14px;flex-wrap:wrap;
  font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:0.18em;color:var(--muted-light);text-transform:uppercase}
.eng-final-strip span:nth-child(even){color:var(--amber-bright);opacity:0.6}

/* ─── подвал ─── */
.eng-foot{background:var(--ink-2);padding:22px 32px;
  display:flex;justify-content:space-between;align-items:center;
  border-top:1px solid rgba(244,239,230,0.06);
  font-family:'Space Grotesk',sans-serif;font-size:13px;color:var(--muted-light);letter-spacing:0.01em}
.eng-foot-meta{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:0.18em;text-transform:uppercase}

/* ─── mobile ─── */
@media(max-width:880px){
  .eng-header{padding:12px 16px}
  .eng-brand-mark{width:26px;height:26px}
  .eng-brand-name{font-size:14px}
  .eng-brand-sub{display:none}
  .eng-nav{gap:14px}
  .eng-nav a:not(.eng-btn){display:none}
  .eng-btn--sm{padding:7px 12px;font-size:11px}
  .slide-grid{grid-template-columns:1fr;gap:36px;padding:100px 22px 90px}
  .slide-meta{flex-direction:column;align-items:flex-start;gap:8px}
  .slide-hero--center{text-align:left}
  .eng-h1{font-size:clamp(32px,9vw,52px)}
  .eng-h{font-size:clamp(30px,8.5vw,44px)}
  .eng-h--big{font-size:clamp(34px,10vw,54px)}
  .eng-lead{font-size:15px}
  .eng-datum-num{font-size:clamp(34px,10vw,44px)}
  .eng-datum-num--xl{font-size:clamp(44px,13vw,60px)}
  .eng-btn--lg{padding:16px 28px;font-size:14px;width:100%}
  .eng-final-strip{justify-content:flex-start;font-size:10px;gap:8px}
  .slide::before{background-size:80px 80px}
  .eng-foot{flex-direction:column;gap:6px;text-align:center;font-size:12px}
}