/* ============================================================
   Шапка и первый экран. Адаптация спецификации "Agentify Hero"
   под статический стек сайта: без React/Tailwind, те же размеры,
   видео-фон с mix-blend-multiply, прокрутка видео курсором.
   ============================================================ */

:root {
  --hero-bg: #e9edf3;
  --hero-hl: #3b82f6;          /* светлый акцент заголовка, контраст 3.3:1 на --hero-bg */
  --head: "Exo 2", "Golos Text", system-ui, sans-serif; /* кириллический аналог Orbitron */
  --header-h: 76px;
}
[data-theme="dark"] {
  --hero-bg: #0a1224;
  --hero-hl: #8fb0ff;
}

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- Шапка ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background .3s, border-color .3s, transform .5s var(--ease);
}
@media (min-width: 1024px) {
  .site-header:not(.is-scrolled) { background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; border-bottom-color: transparent; }
}
.site-header.is-hidden { transform: translateY(-100%); }
.header-inner { max-width: 1600px; margin: 0 auto; padding: 0 var(--gutter); height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); flex: none; }
.logo-mark { position: relative; width: 38px; height: 38px; display: grid; place-items: center; color: var(--primary); flex: none; }
.logo-mark svg { position: absolute; inset: 0; width: 100%; height: 100%; fill: var(--primary-tint); stroke: currentColor; stroke-width: 1.75; stroke-linejoin: round; }
.logo-mark b { position: relative; font-family: var(--head); font-weight: 900; font-size: 0.9375rem; line-height: 1; }
.logo-text { font-family: var(--display); font-weight: 700; font-size: 0.9375rem; letter-spacing: .18em; text-transform: uppercase; }

.nav { display: none; align-items: center; gap: 6px; }
.nav > a, .nav-drop > a { display: inline-flex; align-items: center; gap: 4px; padding: 10px 12px; font-size: 0.9375rem; font-weight: 500; color: var(--muted); border-radius: var(--r-sm); transition: color .3s; }
.nav > a:hover, .nav-drop > a:hover, .nav a.is-active { color: var(--ink); }
.nav a.is-active { box-shadow: inset 0 -2px 0 var(--primary); border-radius: 0; }
.nav svg { width: 16px; height: 16px; transition: transform .3s var(--ease); }
.nav-drop { position: relative; }
.nav-drop:hover > a svg, .nav-drop:focus-within > a svg { transform: rotate(180deg); }
.nav-menu {
  position: absolute; top: calc(100% + 6px); left: -8px; min-width: 300px; padding: 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity .25s, transform .3s var(--ease), visibility .25s;
}
.nav-drop:hover .nav-menu, .nav-drop:focus-within .nav-menu { opacity: 1; visibility: visible; transform: none; }
.nav-menu a { display: grid; gap: 2px; padding: 10px 12px; border-radius: var(--r-sm); transition: background .2s; }
.nav-menu a:hover { background: var(--primary-tint); }
.nav-menu b { font-size: 0.9375rem; font-weight: 600; color: var(--ink); }
.nav-menu span { font-size: 0.8125rem; color: var(--muted); }

.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-2); background: var(--surface); display: grid; place-items: center; color: var(--ink); transition: border-color .3s, color .3s; }
.icon-btn:hover, .icon-btn[aria-pressed="true"] { border-color: var(--primary); color: var(--primary); }
.icon-btn svg { width: 19px; height: 19px; }
.icon-btn .ic-moon { display: none; }
[data-theme="dark"] .icon-btn .ic-sun { display: none; }
[data-theme="dark"] .icon-btn .ic-moon { display: block; }

.btn-pill { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: var(--pill); background: var(--primary); color: var(--on-primary); font-size: 0.9375rem; font-weight: 600; white-space: nowrap; transition: background-color .3s, box-shadow .3s; }
.btn-pill:hover { background: var(--primary-2); }
.btn-pill svg { width: 17px; height: 17px; transition: transform .3s var(--ease); }
.btn-pill:hover svg { transform: translateX(3px); }
.header-actions .btn-pill { display: none; }

.burger { position: relative; width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-2); background: var(--surface); }
.burger span { position: absolute; left: 13px; right: 13px; height: 2px; border-radius: 2px; background: var(--ink); transition: transform .3s var(--ease), opacity .3s, top .3s var(--ease); }
.burger span:nth-child(1) { top: 15px; }
.burger span:nth-child(2) { top: 21px; }
.burger span:nth-child(3) { top: 27px; }
.burger[aria-expanded="true"] span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { top: 21px; transform: rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 40; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 8px;
  padding: calc(var(--header-h) + 24px) var(--gutter) 40px;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s;
}
.mobile-menu.is-open { opacity: 1; visibility: visible; }
.mobile-menu a { font-family: var(--display); font-size: clamp(1.5rem, 7vw, 2rem); font-weight: 600; letter-spacing: -.02em; color: var(--ink); padding: 8px 0; transition: color .3s; }
.mobile-menu a:hover { color: var(--primary); }
.mobile-menu .btn-pill { margin-top: 16px; font-size: 1rem; padding: 14px 24px; }
.mobile-menu .btn-pill:hover { color: var(--on-primary); }

@media (min-width: 1024px) {
  .nav { display: flex; }
  .header-actions .btn-pill { display: inline-flex; }
  .burger, .mobile-menu { display: none; }
}

/* ---------- Первый экран ---------- */
.hero { position: relative; background: var(--hero-bg); overflow: hidden; }
.hero-frame { position: relative; max-width: 1600px; margin: 0 auto; }

/* Видео-фон. Без z-index и масок на контейнере: иначе контейнер станет изолированной
   группой и mix-blend-multiply перестанет смешиваться с фоном секции. */
.hero-video { position: absolute; inset: 0; pointer-events: none; }
.hero-video video {
  display: block; width: 100%; height: 100%; object-fit: cover;
  transform: scale(.8); transform-origin: center;
  opacity: .8; mix-blend-mode: multiply;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, #000 20%, #000 80%, transparent 100%), linear-gradient(to bottom, transparent 0%, #000 15%, #000 82%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to right, transparent 0%, #000 20%, #000 80%, transparent 100%), linear-gradient(to bottom, transparent 0%, #000 15%, #000 82%, transparent 100%);
  mask-composite: intersect;
}
[data-theme="dark"] .hero-video video { mix-blend-mode: screen; filter: invert(1) hue-rotate(180deg) saturate(1.2); opacity: .55; }
@media (min-width: 1024px) { .hero-video video { transform-origin: right center; } }

.hero-content {
  position: relative; z-index: 10; width: 100%; min-height: 100vh; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--header-h) + 40px) var(--gutter) 64px;
  background: rgba(233, 237, 243, .9);
  background: color-mix(in srgb, var(--hero-bg) 90%, transparent);
}
@media (min-width: 1024px) { .hero-content { width: 55%; background: transparent; padding-bottom: 80px; } }
.hero-content { animation: hero-in .6s ease-out both; }
@keyframes hero-in { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }

.hero-badge { align-self: flex-start; display: inline-flex; align-items: center; gap: 10px; padding: 7px 14px; border: 1px solid var(--line-2); border-radius: var(--pill); background: var(--glass); background: color-mix(in srgb, var(--surface) 60%, transparent); font-size: 0.75rem; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); margin-bottom: 28px; }
.hero-badge i { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); flex: none; }

.hero-title { font-family: var(--head); font-weight: 900; font-size: min(2.75rem, calc((100vw - 2 * var(--gutter)) / 10.6)); /* самое длинное слово, ИНФОРМАЦИОННЫЕ, занимает около 10.2 кегля */ line-height: 1.05; letter-spacing: -.02em; color: var(--ink); text-transform: uppercase; margin-bottom: 24px; }
@media (min-width: 768px) { .hero-title { font-size: 3.75rem; } }
@media (min-width: 1280px) { .hero-title { font-size: 4.5rem; } }
.hero-title .hl { color: var(--hero-hl); }
.hero-title .dot { color: var(--primary); }

/* Смена слова в заголовке. Идея из 21st.dev "Animated Hero": слова лежат в одной ячейке
   сетки, ширина слота равна самому длинному слову, поэтому строка не прыгает. */
.rotator { display: inline-grid; vertical-align: top; overflow: hidden; padding: .06em 0 .1em; margin: -.06em 0 -.1em; }
.rotator > span { grid-area: 1 / 1; white-space: nowrap; transform: translateY(110%); opacity: 0; transition: transform .9s cubic-bezier(.3, 1.35, .45, 1), opacity .5s ease; }
.rotator > span.is-active { transform: none; opacity: 1; }
.rotator > span.is-past { transform: translateY(-110%); opacity: 0; }

.hero-sub { font-size: 1.125rem; line-height: 1.65; color: var(--muted); max-width: 560px; margin-bottom: 36px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 56px; }
.hero-cta .btn-pill { padding: 15px 26px; box-shadow: 0 12px 28px -10px var(--primary-glow); }
.btn-ghost-pill { display: inline-flex; align-items: center; gap: 10px; padding: 8px 22px 8px 8px; border-radius: var(--pill); background: var(--surface); border: 1px solid var(--line-2); color: var(--ink); font-size: 0.9375rem; font-weight: 600; transition: border-color .3s, color .3s; }
.btn-ghost-pill:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost-pill .play { width: 36px; height: 36px; border-radius: 50%; background: var(--primary); color: var(--on-primary); display: grid; place-items: center; }
.btn-ghost-pill .play svg { width: 14px; height: 14px; fill: currentColor; margin-left: 2px; }

.hero-stats { display: grid; grid-template-columns: 1fr; gap: 20px; max-width: 640px; }
.hero-stats > div { display: grid; grid-template-columns: auto 1fr; column-gap: 12px; align-items: center; }
.hero-stats svg { grid-row: span 2; width: 26px; height: 26px; color: var(--primary); }
.hero-stats dt { font-family: var(--display); font-size: 1.625rem; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -.02em; line-height: 1.1; color: var(--ink); }
.hero-stats dd { margin: 0; font-size: 0.875rem; color: var(--muted); }
@media (min-width: 640px) {
  .hero-stats { grid-template-columns: repeat(3, auto); gap: 0; }
  .hero-stats > div { grid-template-columns: 1fr; row-gap: 6px; align-content: start; align-items: start; padding: 0 24px; border-left: 1px solid var(--line-2); }
  .hero-stats > div:first-child { padding-left: 0; border-left: 0; }
  .hero-stats svg { grid-row: auto; margin-bottom: 4px; }
}

/* Отступ под фиксированную шапку на внутренних страницах */
.page-hero { padding-top: calc(var(--header-h) + clamp(32px, 6vw, 64px)); }

html.a11y .hero-video { display: none; }
html.a11y .hero-content { animation: none; }
html.a11y .hero-title { font-family: var(--display); letter-spacing: 0; }

/* Крупный шрифт в версии для слабовидящих: меню всегда сворачивается,
   заголовок занимает всю ширину и переносит длинные слова */
html[data-a11y-size="2"] .nav, html[data-a11y-size="3"] .nav,
html[data-a11y-size="2"] .header-actions .btn-pill, html[data-a11y-size="3"] .header-actions .btn-pill { display: none; }
html[data-a11y-size="2"] .burger, html[data-a11y-size="3"] .burger { display: block; }
html[data-a11y-size="2"] .mobile-menu, html[data-a11y-size="3"] .mobile-menu { display: flex; }
html[data-a11y-size="2"] .hero-content, html[data-a11y-size="3"] .hero-content { width: 100%; }
html.a11y .hero-title { overflow-wrap: anywhere; hyphens: auto; font-size: min(4.5rem, 11vw); }
html.a11y #themeBtn { display: none; }
@media (max-width: 480px) { html[data-a11y-size="3"] .logo-text { display: none; } }
@media (max-width: 360px) { html[data-a11y-size="2"] .logo-text { display: none; } }

/* Темная тема без color-mix: полупрозрачный фон контента на мобильном */
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  [data-theme="dark"] .hero-content { background: rgba(10, 18, 36, .9); }
}
@media (min-width: 1024px) { .hero-content { background: transparent !important; } }