:root {
  --bg: #0b0e13;
  --bg-soft: #101420;
  --panel: rgba(19, 24, 35, 0.86);
  --panel-soft: rgba(23, 29, 42, 0.78);
  --panel-inner: rgba(26, 33, 47, 0.84);
  --line: #2b3447;
  --line-soft: #333d52;
  --text: #ecf0f8;
  --muted: #9ca8bc;
  --accent: #6fc7ff;
  --accent-strong: #4daef1;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --shadow: 0 12px 36px rgba(3, 8, 17, 0.35);
  --ease: 220ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "SF Pro Display", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  background:
    radial-gradient(1200px 520px at -8% -8%, rgba(79, 159, 255, 0.16), transparent 60%),
    radial-gradient(940px 460px at 108% -6%, rgba(111, 199, 255, 0.11), transparent 62%),
    linear-gradient(180deg, #0b0e13 0%, #0e121a 100%);

  /* Safe areas для современных мобильных браузеров. */
  padding-top: max(12px, env(safe-area-inset-top));
  padding-right: max(12px, env(safe-area-inset-right));
  padding-bottom: max(18px, env(safe-area-inset-bottom));
  padding-left: max(12px, env(safe-area-inset-left));
}

a {
  color: inherit;
}

.site {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 320ms ease, transform 320ms ease;
}

body.is-ready .site {
  opacity: 1;
  transform: translateY(0);
}

.container {
  width: min(1140px, 100%);
  margin: 0 auto;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel--soft {
  background: var(--panel-soft);
  border-color: var(--line-soft);
}

.panel--inner {
  background: var(--panel-inner);
  border-color: #36435c;
}

.site-header {
  position: sticky;
  top: calc(6px + env(safe-area-inset-top));
  z-index: 30;
  margin: 0 auto 14px;
  width: min(1140px, 100%);
}

.header-inner {
  min-height: 74px;
  padding: 10px 16px;
  display: grid;
  gap: 12px;
  grid-template-columns: auto 1fr auto;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand__name {
  display: inline-block;
  font-family: "Avenir Next", "SF Pro Display", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(1.2rem, 1.3vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  background: linear-gradient(92deg, #eef2fa 0%, #b8e5ff 40%, #79cfff 75%, #eef2fa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 18px rgba(111, 199, 255, 0.2);
  background-size: 220% 220%;
  animation: brand-glow 9s ease-in-out infinite;
}

.brand__mark {
  width: 32px;
  height: 32px;
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  box-shadow:
    0 0 0 1.5px rgba(11, 15, 24, 0.9),
    0 0 18px rgba(111, 199, 255, 0.55);
  animation: brand-orbit 4.8s ease-in-out infinite;
}

.brand__logo {
  width: 100%;
  height: 100%;
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(8px, 1.5vw, 16px);
}

.nav-link {
  position: relative;
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--muted);
  padding: 10px 10px 12px;
  border-radius: 10px;
  transition: color var(--ease), background-color var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform var(--ease), opacity var(--ease), border-color var(--ease), background-color var(--ease);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button--primary {
  color: #05131f;
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
}

.button--primary:hover,
.button--primary:focus-visible {
  opacity: 0.95;
}

.button--ghost {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.button--ghost:hover,
.button--ghost:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 58%, var(--line) 42%);
}

.button--small {
  min-height: 40px;
  padding: 0 14px;
  font-size: 0.92rem;
}

main.container {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 1.9vw, 18px);
}

.section,
.cta,
.page-intro,
.hero {
  padding: clamp(22px, 4.2vw, 48px);
}

.eyebrow {
  margin: 0 0 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.79rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid color-mix(in srgb, var(--accent) 44%, var(--line) 56%);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(111, 199, 255, 0.08);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  line-height: 1.14;
  letter-spacing: -0.018em;
}

h2 {
  letter-spacing: -0.012em;
}

p {
  color: var(--muted);
}

.muted {
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 12px;
}

.cards-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.cards-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cards-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  background: rgba(23, 30, 44, 0.82);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: transform var(--ease), border-color var(--ease), background-color var(--ease);
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line) 50%);
}

.card h3 {
  margin-top: 6px;
  font-size: 1.02rem;
}

.card p {
  margin-top: 8px;
  font-size: 0.95rem;
}

.icon {
  width: 22px;
  height: 22px;
  color: var(--accent);
}

.section__head {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.cta {
  display: grid;
  gap: 14px;
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.site-footer {
  margin: 14px auto 0;
  padding: 18px 22px;
  display: grid;
  gap: 7px;
}

.footer-title {
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  width: 46px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  color: var(--text);
}

.menu-toggle span:not(.sr-only) {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--ease), opacity var(--ease);
}

body.menu-open .menu-toggle span:nth-child(2) {
  transform: translateY(3.5px) rotate(45deg);
}

body.menu-open .menu-toggle span:nth-child(3) {
  transform: translateY(-3.5px) rotate(-45deg);
}

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

.preloader {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  background: rgba(10, 13, 20, 0.96);
  opacity: 0;
  pointer-events: none;
  transition: opacity 260ms ease;
}

.preloader.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.preloader.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.preloader__box {
  width: min(280px, 88vw);
  display: grid;
  gap: 14px;
  justify-items: center;
}

.preloader__name {
  font-family: "Avenir Next", "SF Pro Display", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
}

.preloader__line {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 999px;
  overflow: hidden;
}

.preloader__line span {
  display: block;
  height: 100%;
  width: 100%;
  border-radius: 999px;
  transform-origin: left center;
  transform: scaleX(0.04);
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  animation: preloader-line 820ms ease forwards;
}

@keyframes preloader-line {
  0% {
    transform: scaleX(0.04);
  }
  100% {
    transform: scaleX(1);
  }
}

@keyframes brand-glow {
  0%,
  100% {
    background-position: 0% 50%;
    text-shadow: 0 0 18px rgba(111, 199, 255, 0.3);
  }
  50% {
    background-position: 100% 50%;
    text-shadow: 0 0 22px rgba(111, 199, 255, 0.6);
  }
}

@keyframes brand-orbit {
  0%,
  100% {
    transform: translateY(0) scale(1);
    box-shadow:
      0 0 0 1.5px rgba(11, 15, 24, 0.9),
      0 0 16px rgba(111, 199, 255, 0.4);
  }
  40% {
    transform: translateY(-2px) scale(1.04);
    box-shadow:
      0 0 0 1.5px rgba(11, 15, 24, 0.9),
      0 0 24px rgba(111, 199, 255, 0.7);
  }
  70% {
    transform: translateY(1px) scale(0.98);
  }
}

.page-transition {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(10, 13, 20, 0.88);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 240ms ease, transform 240ms ease;
}

body.is-leaving .page-transition {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 380ms ease, transform 380ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.is-hidden {
  display: none !important;
}

@media (max-width: 960px) {
  .cards-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cards-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .header-inner {
    grid-template-columns: auto auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    grid-column: 1 / -1;
    display: grid;
    gap: 6px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: max-height 240ms ease, opacity 240ms ease, transform 240ms ease;
  }

  body.menu-open .site-nav {
    max-height: 280px;
    opacity: 1;
    transform: translateY(0);
    padding-top: 4px;
  }

  .nav-link {
    padding: 10px 12px;
  }

  .header-cta {
    display: none;
  }
}

@media (max-width: 620px) {
  .panel {
    border-radius: 18px;
  }

  .button {
    min-width: 100%;
  }

  .cards-2,
  .cards-3,
  .cards-4 {
    grid-template-columns: 1fr;
  }
}

@media (orientation: landscape) and (max-height: 620px) {
  .site-header {
    position: static;
  }

  .section,
  .cta,
  .page-intro,
  .hero {
    padding-top: 18px;
    padding-bottom: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .site,
  .reveal,
  .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}