:root {
  color-scheme: light dark;
  --ink: #0b1f3a;
  --accent: #2764e7;
  --accent-dark: #6f9cff;
  --paper: #f7f9fc;
  --surface: rgba(255, 255, 255, 0.82);
  --line: rgba(11, 31, 58, 0.14);
  --muted: #506079;
  --shadow: 0 20px 60px rgba(11, 31, 58, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(39, 100, 231, 0.12), transparent 36rem),
    linear-gradient(180deg, #ffffff 0%, var(--paper) 100%);
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

nav {
  display: flex;
  gap: 18px;
  font-size: 0.94rem;
}

nav a {
  color: var(--muted);
  font-weight: 650;
  text-decoration: none;
}

main {
  padding: 52px 0 72px;
}

.hero {
  padding: 56px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.compatibility {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.section {
  margin-top: 28px;
  padding: 44px 48px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
}

.section h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.steps article {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.38);
}

.steps span {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

.steps h3 { margin: 18px 0 8px; }
.steps p, .feature-list, .faq p { color: var(--muted); line-height: 1.65; }
.steps p { margin: 0; }
.split { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 40px; align-items: start; }
.compact { font-size: 1rem; }
.feature-list { margin: 0; padding-left: 22px; }
.feature-list li + li { margin-top: 12px; }
.faq details { padding: 18px 0; border-bottom: 1px solid var(--line); }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { margin-bottom: 0; }

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(2.3rem, 8vw, 4.3rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.lede {
  max-width: 610px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1.65;
}

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

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

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

.document {
  padding: 44px 48px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.document h1 {
  font-size: clamp(2.2rem, 7vw, 3.5rem);
  line-height: 1.05;
}

.document h2 {
  margin: 40px 0 12px;
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}

.document p,
.document li {
  color: var(--muted);
  line-height: 1.7;
}

.document li + li {
  margin-top: 8px;
}

.updated {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

footer {
  padding: 0 0 36px;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

@media (max-width: 620px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .section,
  .document {
    padding: 32px 24px;
    border-radius: 20px;
  }

  main {
    padding-top: 24px;
  }

  .grid, .split { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f8faff;
    --accent: var(--accent-dark);
    --paper: #07111f;
    --surface: rgba(15, 29, 49, 0.84);
    --line: rgba(236, 243, 255, 0.16);
    --muted: #b6c2d4;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
  }

  body {
    background:
      radial-gradient(circle at 10% 0%, rgba(111, 156, 255, 0.16), transparent 36rem),
      linear-gradient(180deg, #081426 0%, var(--paper) 100%);
  }

  .button {
    background: rgba(255, 255, 255, 0.06);
  }

  .button.primary {
    background: #457cf0;
    color: #fff;
  }

  .steps article { background: rgba(255, 255, 255, 0.035); }
}