:root {
  --bg: #384150;
  --surface: #1a202a;
  --surface-soft: #1f2633;
  --bghero1: rgb(34, 34, 34);
  --bghero2: rgb(6, 6, 6);


  --ev-regular-stroke: #356eec;
  --text: #eef4ff;
  --muted: #bcc7db;
  --line: rgba(255, 255, 255, 0.14);
  --ui-soft-bg: rgba(255, 255, 255, 0.03);
  --ui-soft-bg-strong: rgba(255, 255, 255, 0.04);
  --accent: #356eec;
  --accent-strong: #5a86ee;
  --shadow: 0 14px 30px rgba(0, 0, 0, 0.34);
  --radius-lg: 16px;
  --radius-md: 12px;
  --maxw: 1040px;
  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --surface: #f7f9fc;
    --surface-soft: #eef2f7;
    --bghero1: rgb(243, 243, 243);
    --bghero2: rgb(232, 232, 232);
    --text: #1b2432;
    --muted: #55657d;
    --line: rgba(24, 36, 54, 0.16);
    --ui-soft-bg: rgba(15, 23, 42, 0.03);
    --ui-soft-bg-strong: rgba(15, 23, 42, 0.045);
    --shadow: 0 10px 24px rgba(24, 36, 54, 0.12);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  color: var(--text);
  font-family: "Manrope", "Avenir Next", "Segoe UI", sans-serif;
  background:
    radial-gradient(1100px 580px at 100% -20%, rgba(53, 110, 236, 0.18), transparent 56%),
    radial-gradient(980px 560px at 0% 0%, rgba(90, 134, 238, 0.12), transparent 54%),
    var(--bg);
  line-height: 1.68;
}

@media (prefers-color-scheme: light) {
  body {
    background:
      radial-gradient(1050px 540px at 100% -18%, rgba(53, 110, 236, 0.13), transparent 56%),
      radial-gradient(920px 500px at 0% 0%, rgba(90, 134, 238, 0.09), transparent 54%),
      var(--bg);
  }
}

a {
  color: inherit;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 16px 58px;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  background:
    linear-gradient(145deg, var(--bghero1), var(--bghero2)) padding-box,
    linear-gradient(3520deg, var(--ev-regular-stroke) 30%, rgba(0, 0, 0, 0) 100%) border-box;
  box-shadow: var(--shadow);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
}

.nav,
.topnav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ui-soft-bg);
}

.nav a,
.topnav a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-size: 13px;
}

.lang-link {
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  text-decoration: none;
  font-size: 13px;
  background: var(--ui-soft-bg);
}

/* On EN pages, show RU switch only for RU-localized browsers (set via JS). */
html[lang="en"] .lang-link[hreflang="ru"] {
  display: none;
}

html[lang="en"] .lang-link[hreflang="ru"].lang-link-visible {
  display: inline-flex;
}

.hero,
.section,
.card {
  background: linear-gradient(145deg, var(--bghero1), var(--bghero2));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero {
  border: 1px solid transparent;
  background:
    linear-gradient(145deg, var(--bghero1), var(--bghero2)) padding-box,
    linear-gradient(3520deg, var(--ev-regular-stroke) 30%, rgba(0, 0, 0, 0) 100%) border-box;
}

.hero {
  padding: 24px;
  margin-top: 14px;
}

.section,
.card {
  padding: 18px;
  margin-top: 14px;
}

#discovery::after {
  content: "";
  display: block;
  clear: both;
}

#discovery .discovery-float-image {
  float: left;
  display: block;
  width: auto;
  height: auto;
  max-height: 280px;
  margin: 4px 16px 10px 0;
  border-radius: 8px;
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr 1fr;
  margin-top: 14px;
}

.grid .section,
.grid .card {
  margin-top: 0;
}

h1 {
  margin: 0 0 10px;
  font-size: 38px;
  line-height: 1.12;
  letter-spacing: -0.3px;
}

h2 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.3;
}

p {
  margin: 0 0 10px;
  color: var(--muted);
}

ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

li {
  margin: 6px 0;
}

.sub,
.lead {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.68;
  max-width: 900px;
}

.cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  text-decoration: none;
  font-weight: 600;
  color: var(--text);
  background: var(--ui-soft-bg-strong);
}

.btn.primary {
  border: 1px solid transparent;
  background:
    linear-gradient(145deg, var(--bghero1), var(--bghero2)) padding-box,
    linear-gradient(3520deg, var(--ev-regular-stroke) 30%, rgba(0, 0, 0, 0) 100%) border-box;
}

.faq details {
  margin: 10px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px;
  background: var(--ui-soft-bg);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.footer,
footer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.footer a,
footer a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

header {
  margin-bottom: 14px;
}

.topline {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 12px;
}

header nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

header nav a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.updated {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.callout {
  margin: 18px 0;
  padding: 12px 14px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 14px;
  border-radius: var(--radius-md);
  background:
    linear-gradient(145deg, var(--bghero1), var(--bghero2)) padding-box,
    linear-gradient(3520deg, var(--ev-regular-stroke) 30%, rgba(0, 0, 0, 0) 100%) border-box;
}

.mono,
code {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

main > .section:first-child,
main > .hero:first-child,
main > .grid:first-child {
  margin-top: 0;
}

@media (max-width: 920px) {
  .grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 32px;
  }

  #discovery .discovery-float-image {
    float: none;
    margin: 8px 0 12px;
    max-height: 240px;
  }
}