:root {
  color-scheme: dark;
  --bg: #0b1220;
  --panel: #141f32;
  --line: #2b3a51;
  --text: #f4f7ff;
  --muted: #b9c5d7;
  --blue: #4288f7;
  --blue2: #75b7ff;
  --secondary-text: #f4f7ff;
  --secondary-border: #5d7496;
  --header-bg: #0d1728;
  --hero-glow: #1d3b65;
  --eyebrow: #8fc5ff;
  --step-bg: #254c83;
  --soft-bg: #101c2e;
  --notice-bg: #17263b;
  --partner-bg: #152237;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f8fc;
  --panel: #fff;
  --line: #d7e1ee;
  --text: #182338;
  --muted: #52627a;
  --blue: #236bd1;
  --blue2: #2165ad;
  --secondary-text: #1b5ba8;
  --secondary-border: #6c91bd;
  --header-bg: #fff;
  --hero-glow: #e0efff;
  --eyebrow: #245a9d;
  --step-bg: #d8e9ff;
  --soft-bg: #edf3fa;
  --notice-bg: #eaf3ff;
  --partner-bg: #f8fbff;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.65 system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    sans-serif;
}
a {
  color: inherit;
}
a:focus-visible {
  outline: 3px solid #a8d6ff;
  outline-offset: 4px;
}
.container {
  width: min(1100px, calc(100% - 36px));
  margin: auto;
}
header {
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 0;
  flex-wrap: wrap;
}
.brand {
  font-weight: 850;
  letter-spacing: 0.05em;
  text-decoration: none;
  font-size: 1.18rem;
}
.brand span {
  color: var(--blue2);
}
.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 14px;
}
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.94rem;
}
.links a {
  text-decoration: none;
  color: var(--muted);
}
.links a:hover {
  color: var(--text);
}
.theme-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 13px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
}
.theme-toggle:hover {
  border-color: var(--blue);
}
.hero {
  padding: 92px 0 76px;
  background: radial-gradient(ellipse at 75% 10%, var(--hero-glow) 0, transparent 53%);
}
.eyebrow {
  color: var(--eyebrow);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1 {
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  line-height: 1.12;
  letter-spacing: -0.045em;
  margin: 16px 0 22px;
  max-width: 1100px;
}
h2 {
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
}
h3 {
  font-size: 1.15rem;
  margin: 0 0 10px;
}
.lead {
  font-size: 1.2rem;
  max-width: 730px;
  color: var(--muted);
}
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.button {
  display: inline-block;
  background: var(--blue);
  border: 1px solid var(--blue);
  padding: 12px 19px;
  border-radius: 11px;
  text-decoration: none;
  font-weight: 750;
  color: white;
}
.button.secondary {
  background: transparent;
  border-color: var(--secondary-border);
  color: var(--secondary-text);
}
.button:hover {
  filter: brightness(1.13);
}
section {
  padding: 68px 0;
}
.section-note {
  max-width: 760px;
  color: var(--muted);
  margin-top: -6px;
  margin-bottom: 28px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 25px;
}
.card p {
  color: var(--muted);
  margin: 0;
}
.symbol {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 15px;
}
.steps {
  counter-reset: steps;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}
.step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 17px;
  padding: 24px;
}
.step::before {
  counter-increment: steps;
  content: counter(steps);
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--step-bg);
  color: #fff;
  font-weight: 800;
  margin-bottom: 17px;
}
.step p {
  color: var(--muted);
  margin: 0;
}
.soft {
  background: var(--soft-bg);
  border-block: 1px solid var(--line);
}
.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: start;
}
.two p,
.copy p {
  color: var(--muted);
}
.notice {
  border-left: 3px solid var(--blue2);
  padding: 14px 18px;
  background: var(--notice-bg);
  color: var(--muted);
  border-radius: 0 10px 10px 0;
  margin-top: 22px;
}
.partner {
  padding: 30px;
  border: 1px dashed #6681a5;
  border-radius: 15px;
  background: var(--partner-bg);
}
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
.footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
small {
  color: var(--muted);
}
@media (max-width: 850px) {
  .nav-actions {
    justify-content: flex-start;
  }
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .two {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 65px 0;
  }
}
@media (max-width: 520px) {
  .grid {
    grid-template-columns: 1fr;
  }
  section {
    padding: 50px 0;
  }
  .links {
    gap: 11px;
  }
  .card {
    padding: 22px;
  }
}