:root {
  color-scheme: light;
  --ink: #131a3d;
  --blue: #5872ff;
  --cyan: #00b8df;
  --paper: #ffffff;
  --panel: #f3f5fb;
  --line: #dfe4f3;
  --muted: #616b87;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
}
a { color: #3f5ce8; }
.wrap { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
header { border-bottom: 1px solid var(--line); }
nav { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 72px; }
.brand { color: var(--ink); font-size: 23px; font-weight: 800; text-decoration: none; }
.brand::before { content: ""; display: inline-block; width: 28px; height: 8px; margin-right: 9px; background: var(--cyan); vertical-align: middle; }
.links { display: flex; flex-wrap: wrap; gap: 16px; }
.links a { color: var(--muted); font-size: 14px; text-decoration: none; }
.hero { padding: 88px 0 64px; text-align: center; }
.hero h1 { margin: 0; font-size: clamp(48px, 10vw, 88px); letter-spacing: 0; }
.hero p { max-width: 620px; margin: 16px auto 28px; color: var(--muted); font-size: 20px; }
.beam { width: min(560px, 82vw); height: 5px; margin: 0 auto 22px; background: var(--ink); position: relative; }
.beam::after { content: ""; position: absolute; right: -2px; top: -6px; width: 17px; height: 17px; background: var(--cyan); }
.button { display: inline-block; padding: 13px 25px; border-radius: 7px; background: var(--blue); color: white; font-weight: 700; text-decoration: none; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding: 20px 0 70px; }
.card, article { border: 1px solid var(--line); border-radius: 8px; background: var(--panel); padding: 24px; }
.card h2 { margin-top: 0; font-size: 20px; }
.card p { margin-bottom: 0; color: var(--muted); }
article { margin: 36px auto 60px; background: white; }
article h1 { margin-top: 0; font-size: 38px; }
article h2 { margin-top: 34px; font-size: 23px; }
article li { margin-bottom: 8px; }
.muted { color: var(--muted); }
.notice { padding: 14px 16px; border-left: 4px solid var(--cyan); background: var(--panel); }
footer { padding: 28px 0 42px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; text-align: center; }
footer a { margin: 0 8px; }
@media (max-width: 680px) {
  nav { align-items: flex-start; flex-direction: column; padding: 18px 0; }
  .grid { grid-template-columns: 1fr; }
  .hero { padding-top: 64px; }
  article { padding: 20px; }
}