/* reactortech.ru v3. Структура — по мотивам product.vision, оформление — монохромная система
   (02_ooo/brand/design-system.md в базе знаний) */

@font-face { font-family: 'Plex'; src: url('../fonts/IBMPlexSans-Regular.ttf') format('truetype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Plex'; src: url('../fonts/IBMPlexSans-Medium.ttf') format('truetype'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'Plex'; src: url('../fonts/IBMPlexSans-SemiBold.ttf') format('truetype'); font-weight: 600; font-display: swap; }

:root {
  --ink: #000;
  --graphite: #666;
  --smoke: #8f8f8f;
  --paper: #fff;
  --hairline: rgba(0, 0, 0, .12);
  --whisper: rgba(0, 0, 0, .04);
  --brand: #fb631b;

  --font: 'Plex', Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --max: 1200px;
  --gutter: 24px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.65 var(--font);
  letter-spacing: -0.01em;
  font-feature-settings: 'calt' 1, 'liga' 1;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .94); backdrop-filter: blur(8px); border-bottom: 1px solid transparent; }
.nav .wrap { height: 64px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 500; white-space: nowrap; }
.brand svg { width: 26px; height: 26px; flex: none; }
.menu { display: flex; gap: 2px; margin-left: auto; }
.menu a { font-size: 14px; font-weight: 500; padding: 6px 12px; border-radius: 9999px; }
.menu a:hover { background: var(--whisper); }
.menu a[aria-current="page"] { background: var(--whisper); }
.nav .cta { margin-left: 8px; }
.burger { display: none; margin-left: auto; font: inherit; font-size: 14px; font-weight: 500; background: none; border: 1px solid var(--hairline); border-radius: 9999px; padding: 6px 16px; cursor: pointer; color: var(--ink); }

/* ---------- Pills ---------- */
.pill {
  display: inline-block; font-size: 14px; font-weight: 500; line-height: 1.4;
  padding: 9px 20px; border: 1px solid var(--hairline); border-radius: 9999px;
  transition: background .15s;
}
.pill:hover { background: var(--whisper); }
.pill.solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.pill.solid:hover { background: #222; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 13px; font-weight: 500; padding: 5px 14px; border: 1px solid var(--hairline); border-radius: 9999px; color: var(--graphite); }

/* ---------- Kicker & section head ---------- */
.kicker { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; color: var(--graphite); }
.kicker::before { content: ''; width: 20px; height: 1px; background: currentColor; }
.sec { padding-top: 128px; }
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 48px; }
.sec-head h2 { font-size: clamp(28px, 3.4vw, 40px); line-height: 1.12; font-weight: 500; letter-spacing: -0.03em; margin-top: 14px; max-width: 22ch; }
.sec-head p { color: var(--graphite); max-width: 52ch; margin-top: 14px; }
.more { font-size: 14px; font-weight: 500; white-space: nowrap; padding: 6px 12px; border-radius: 9999px; }
.more:hover { background: var(--whisper); }

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: 1.25fr .75fr; gap: 48px; align-items: center; padding-top: 88px; }
.hero h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.04; letter-spacing: -0.035em; font-weight: 500; margin-top: 20px; max-width: 15ch; }
.hero .lead { font-size: 21px; line-height: 1.45; color: var(--graphite); max-width: 42ch; margin-top: 24px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 36px; }
.hero .chips { margin-top: 28px; }
.art { width: 100%; max-width: 440px; justify-self: end; aspect-ratio: 1; }
.art svg { width: 100%; height: 100%; overflow: visible; }
.art .orbits { transform-origin: 50% 50%; animation: spin 90s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .art .orbits { animation: none; } }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 88px; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.stat { padding: 24px 24px 28px; border-left: 1px solid var(--hairline); }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat b { display: block; font-size: 44px; line-height: 1.05; font-weight: 500; letter-spacing: -0.035em; }
.stat span { display: block; font-size: 14px; color: var(--graphite); margin-top: 8px; }

/* ---------- Cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card {
  display: flex; flex-direction: column; gap: 10px;
  border: 1px solid var(--hairline); border-radius: 6px; padding: 28px;
  transition: background .15s, border-color .15s;
}
a.card:hover { background: var(--whisper); border-color: rgba(0, 0, 0, .2); }
.card .num, .card .tag { font-size: 13px; font-weight: 500; color: var(--smoke); }
.card h3 { font-size: 24px; line-height: 1.2; letter-spacing: -0.02em; font-weight: 500; }
.card p { color: var(--graphite); }
.card .go { margin-top: auto; padding-top: 14px; font-size: 14px; font-weight: 500; }
.card.dir { min-height: 300px; }
.card.dir h3 { font-size: 30px; }
.card.proj { min-height: 230px; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.step { border-top: 1px solid var(--ink); padding-top: 20px; }
.step .num { font-size: 13px; font-weight: 500; color: var(--smoke); }
.step h3 { font-size: 22px; line-height: 1.26; font-weight: 500; letter-spacing: -0.01em; margin-top: 8px; }
.step p { color: var(--graphite); margin-top: 8px; }

/* ---------- Team ---------- */
.person { display: grid; grid-template-columns: 160px 1fr; gap: 24px; align-items: start; border: 1px solid var(--hairline); border-radius: 6px; padding: 24px; }
.mono {
  aspect-ratio: 1; border-radius: 4px; border: 1px solid var(--hairline);
  background-image: radial-gradient(rgba(0, 0, 0, .16) 1px, transparent 1px); background-size: 10px 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 44px; font-weight: 500; letter-spacing: -0.04em;
}
.person h3 { font-size: 22px; font-weight: 500; letter-spacing: -0.01em; }
.person .role { font-size: 14px; font-weight: 500; color: var(--graphite); margin-top: 2px; }
.person p { color: var(--graphite); margin-top: 12px; font-size: 16px; }

/* ---------- Footer ---------- */
footer { margin-top: 128px; border-top: 1px solid var(--hairline); font-size: 14px; color: var(--graphite); }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding-top: 48px; }
.foot-grid h4 { font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 12px; }
.foot-grid a { display: block; padding: 2px 0; }
.foot-grid a:hover { color: var(--ink); }
.foot-grid .brand { color: var(--ink); }
.foot-grid .brand + p { margin-top: 12px; max-width: 30ch; }
.legal { font-size: 13px; color: var(--smoke); padding: 40px 0 56px; }

/* ---------- Главная: первый экран на всю высоту ---------- */
.hero-home { min-height: calc(100svh - 64px); padding-top: 0; }

/* ---------- Перелистывание страниц (assets/js/pager.js) ---------- */
/* Плавный переход между страницами: шапка стоит, содержимое уезжает и проявляется */
@view-transition { navigation: auto; }
.nav { view-transition-name: site-nav; }
::view-transition-old(root) { animation: vt-out .38s cubic-bezier(.4, 0, .2, 1) both; }
::view-transition-new(root) { animation: vt-in .55s cubic-bezier(.2, 0, 0, 1) both; }
@keyframes vt-out { to { opacity: 0; transform: translateY(-28px); } }
@keyframes vt-in { from { opacity: 0; transform: translateY(36px); } }
/* Браузеры без View Transitions — простое проявление */
html:not(.vt) body { animation: page-in .45s ease both; }
html:not(.vt) body.leaving { opacity: 0; transition: opacity .25s ease; }
@keyframes page-in { from { opacity: 0; } }

.pager-next { display: block; border-top: 1px solid var(--hairline); padding: 32px 0 48px; }
.pager-row { display: flex; align-items: baseline; gap: 14px; }
.pager-label { font-size: 14px; font-weight: 500; color: var(--graphite); }
.pager-title { font-size: 22px; font-weight: 500; letter-spacing: -0.01em; }
.pager-next:hover .pager-title { text-decoration: underline; text-underline-offset: 4px; }
.pager-track { display: block; height: 2px; background: var(--hairline); margin-top: 16px; border-radius: 2px; overflow: hidden; }
.pager-track > span { display: block; height: 100%; width: calc(var(--p, 0) * 100%); background: var(--ink); transition: width .1s linear; }

.pager-prev {
  position: fixed; z-index: 30; top: 76px; left: 50%;
  transform: translate(-50%, -8px); opacity: 0; pointer-events: none;
  background: var(--paper); border: 1px solid var(--hairline); border-radius: 9999px;
  padding: 8px 18px 10px; font-size: 14px; font-weight: 500; min-width: 160px; text-align: center;
  transition: opacity .15s, transform .15s;
}
.pager-prev.on { opacity: 1; transform: translate(-50%, 0); }
.pager-prev .pager-track { margin-top: 6px; }

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
  html:not(.vt) body { animation: none; }
  .pager-track > span { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
  .art { display: none; }
  .grid-3, .steps { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  :root { --gutter: 16px; }
  .menu, .nav .cta { display: none; }
  .burger { display: block; }
  .nav.open .menu {
    display: flex; flex-direction: column; position: absolute; left: 0; right: 0; top: 64px;
    background: var(--paper); padding: 8px var(--gutter) 16px; border-bottom: 1px solid var(--hairline);
  }
  .nav.open .menu a { padding: 10px 12px; font-size: 16px; }
  .hero { padding-top: 56px; }
  .hero .lead { font-size: 19px; }
  .sec { padding-top: 96px; }
  .sec-head { flex-direction: column; align-items: flex-start; margin-bottom: 32px; }
  .stats { grid-template-columns: 1fr 1fr; margin-top: 56px; }
  .stat { padding: 20px 16px 22px; }
  .stat:nth-child(odd) { border-left: 0; padding-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--hairline); }
  .stat b { font-size: 36px; }
  .grid-2 { grid-template-columns: 1fr; }
  .card.dir, .card.proj { min-height: 0; }
  .person { grid-template-columns: 96px 1fr; gap: 16px; }
  .mono { font-size: 28px; }
  footer { margin-top: 96px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-grid > :first-child { grid-column: 1 / -1; }
}
@media (max-width: 420px) {
  .foot-grid { grid-template-columns: 1fr; }
  .person { grid-template-columns: 1fr; }
  .mono { width: 96px; }
}