:root {
  color-scheme: light dark;
  --bg: #f6f8ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --text: #1d2433;
  --muted: #626b7c;
  --line: rgba(49, 65, 105, 0.14);
  --brand: #5c73dc;
  --brand-strong: #4962d1;
  --brand-soft: #e8edff;
  --shadow: 0 18px 50px rgba(55, 73, 135, 0.12);
  --radius: 24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10131c;
    --surface: rgba(28, 33, 47, 0.9);
    --surface-solid: #1c212f;
    --text: #f4f6ff;
    --muted: #b6bed0;
    --line: rgba(215, 222, 255, 0.13);
    --brand: #8397f3;
    --brand-strong: #9aabff;
    --brand-soft: rgba(105, 127, 224, 0.18);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(101, 126, 226, 0.20), transparent 32rem),
    radial-gradient(circle at 95% 18%, rgba(150, 171, 255, 0.15), transparent 28rem),
    var(--bg);
  line-height: 1.65;
}

a { color: var(--brand-strong); }
a:hover { text-decoration-thickness: 2px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(69, 88, 170, 0.22);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  padding: 7px 10px;
  border-radius: 10px;
  font-size: 0.93rem;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
  background: var(--brand-soft);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 58px 22px 78px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(250px, 0.75fr);
  align-items: center;
  gap: 54px;
  min-height: 540px;
}

.hero-icon {
  width: min(310px, 72vw);
  justify-self: center;
  border-radius: 28%;
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--brand-strong);
  background: var(--brand-soft);
  font-size: 0.88rem;
  font-weight: 700;
}

h1, h2, h3 {
  letter-spacing: -0.035em;
  line-height: 1.2;
}

h1 {
  margin: 20px 0 18px;
  font-size: clamp(2.5rem, 7vw, 5rem);
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
}

h3 { margin: 0 0 8px; }

.lead {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.28rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--surface-solid);
}

.button.primary {
  color: #fff;
  background: var(--brand);
  border-color: transparent;
}

.button.disabled {
  cursor: default;
  opacity: 0.72;
}

.section { margin-top: 76px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card,
.document {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card { padding: 25px; }
.card p { margin: 0; color: var(--muted); }
.card .symbol {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 17px;
  border-radius: 13px;
  background: var(--brand-soft);
  font-size: 1.25rem;
}

.document {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(26px, 6vw, 62px);
}

.document-header {
  padding-bottom: 28px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.document h1 {
  margin: 12px 0 10px;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
}

.document h2 {
  margin-top: 42px;
  font-size: 1.55rem;
}

.document p,
.document li { color: var(--muted); }
.document strong { color: var(--text); }
.document ul { padding-left: 1.25rem; }

.notice {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--brand-soft);
  color: var(--text);
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  font-weight: 720;
  color: var(--text);
}
.faq details p { margin-bottom: 0; }

.lang-divider {
  margin: 54px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 22px 42px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

footer a { color: inherit; }

@media (max-width: 780px) {
  .nav { align-items: flex-start; }
  .nav-links { gap: 2px; }
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 18px;
  }
  .hero-icon { grid-row: 1; width: 190px; }
  .grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .nav { flex-direction: column; }
  .nav-links { justify-content: flex-start; }
  main { padding-top: 36px; }
}

[hidden] { display: none !important; }

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
}

.language-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-solid);
}

.language-switch button {
  min-height: 34px;
  padding: 0 10px;
  border: 0;
  border-radius: 9px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] {
  color: var(--text);
  background: var(--brand-soft);
}

@media (max-width: 900px) {
  .nav-actions {
    align-items: flex-end;
    flex-direction: column-reverse;
    gap: 7px;
  }
}

@media (max-width: 520px) {
  .nav-actions { align-items: flex-start; }
}