:root {
  color-scheme: light dark;
  --bg: #f3f9ff;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-solid: #ffffff;
  --text: #10233f;
  --muted: #5d6e83;
  --line: rgba(24, 94, 157, 0.15);
  --brand: #078cf0;
  --brand-strong: #066fc6;
  --brand-soft: #e0f4ff;
  --accent: #18cfb3;
  --good: #3dcf45;
  --shadow: 0 20px 56px rgba(25, 103, 171, 0.14);
  --radius: 24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #081522;
    --surface: rgba(15, 34, 53, 0.92);
    --surface-solid: #10243a;
    --text: #f3f9ff;
    --muted: #b4c5d7;
    --line: rgba(188, 225, 255, 0.14);
    --brand: #36a8ff;
    --brand-strong: #75c4ff;
    --brand-soft: rgba(35, 155, 235, 0.18);
    --accent: #3ce0c5;
    --good: #66de68;
    --shadow: 0 20px 56px rgba(0, 0, 0, 0.3);
  }
}

* { 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 8% 0%, rgba(16, 153, 246, 0.22), transparent 31rem),
    radial-gradient(circle at 94% 16%, rgba(38, 222, 184, 0.18), transparent 29rem),
    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: 760;
  letter-spacing: -0.02em;
}
.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(9, 128, 218, 0.24);
}
.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
}
.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);
}
.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 9px;
  border: 0;
  border-radius: 9px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}
.language-switch button[aria-pressed="true"] {
  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: 720px;
  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: linear-gradient(135deg, var(--brand), var(--accent));
  border-color: transparent;
}
.button.disabled {
  cursor: default;
  opacity: 0.75;
}
.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;
}
.plan-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.plan-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.plan-card ul { margin-bottom: 0; padding-left: 1.25rem; color: var(--muted); }
.plan-card.pro { box-shadow: inset 0 3px 0 var(--accent), var(--shadow); }
.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; }
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; }
[hidden] { display: none !important; }

@media (max-width: 900px) {
  .nav-actions {
    align-items: flex-end;
    flex-direction: column-reverse;
    gap: 7px;
  }
}
@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,
  .plan-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav { flex-direction: column; }
  .nav-actions { align-items: flex-start; width: 100%; }
  .nav-links { justify-content: flex-start; }
  .language-switch { max-width: 100%; }
  main { padding-top: 36px; }
}