:root {
  color-scheme: light dark;
  --bg: #f7faff;
  --card: rgba(255, 255, 255, .9);
  --text: #17233d;
  --muted: #66738f;
  --line: #d8e2f2;
  --accent: #367af6;
  --accent-2: #675be7;
  --notice: #eef5ff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 85% 0%, rgba(54, 122, 246, .16), transparent 32rem),
    radial-gradient(circle at 0% 80%, rgba(103, 91, 231, .10), transparent 28rem),
    var(--bg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--accent); }
.shell { width: min(1040px, calc(100% - 32px)); margin: 0 auto; }
nav {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 22px 0;
}
nav .logo {
  margin-right: auto;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
}
nav a:not(.logo) { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--accent); }
main { padding: 34px 0 72px; }
.card {
  padding: clamp(28px, 6vw, 64px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 24px 70px rgba(50, 75, 120, .13);
  backdrop-filter: blur(20px);
}
.brand {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 750;
  letter-spacing: .04em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  background-clip: text;
  color: transparent;
}
h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(38px, 7vw, 64px);
  line-height: 1.05;
  letter-spacing: -.04em;
}
h2 { margin: 42px 0 10px; font-size: 23px; letter-spacing: -.015em; }
h3 { margin: 0 0 8px; }
p, li { color: var(--muted); }
strong { color: var(--text); }
ul { padding-left: 22px; }
.lede { max-width: 760px; margin: 22px 0; font-size: 20px; }
.meta { margin: 14px 0 28px; }
.notice {
  padding: 18px 20px;
  border: 1px solid rgba(54, 122, 246, .22);
  border-radius: 14px;
  background: var(--notice);
  color: var(--text);
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 34px;
}
.feature {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.4);
}
.button {
  display: inline-block;
  margin-top: 10px;
  padding: 11px 18px;
  border-radius: 11px;
  color: white;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  font-weight: 700;
  text-decoration: none;
}
footer {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
footer span { margin-right: auto; }
@media (max-width: 720px) {
  nav { gap: 12px; font-size: 14px; }
  .grid { grid-template-columns: 1fr; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101525; --card: rgba(25, 33, 54, .9); --text: #f2f6ff;
    --muted: #aab5cc; --line: #34415b; --notice: #222c43;
  }
  .feature { background: rgba(255,255,255,.025); }
}