:root {
  --ground: #0B0B10;
  --surface: #14141C;
  --ink: #ECECF3;
  --ink-soft: #A2A2B4;
  --line: #26262F;
  --pink: #FF4A99;
  --blue: #4A8CFF;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 56px 22px 90px; }
header { border-bottom: 1px solid var(--line); padding-bottom: 26px; margin-bottom: 34px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; letter-spacing: -.01em; }
.mark { width: 26px; height: 26px; border-radius: 7px; background: linear-gradient(135deg, var(--pink), var(--blue)); flex: none; }
h1 { font-size: clamp(29px, 5vw, 38px); line-height: 1.12; letter-spacing: -.025em; margin: 20px 0 8px; }
.date { color: var(--ink-soft); font-size: 14px; margin: 0; }
h2 { font-size: 21px; letter-spacing: -.015em; margin: 40px 0 12px; }
h3 { font-size: 17px; margin: 26px 0 8px; }
p, li { color: var(--ink-soft); }
p { margin: 0 0 14px; }
ul { padding-left: 20px; margin: 0 0 16px; }
li { margin-bottom: 8px; }
strong { color: var(--ink); font-weight: 600; }
a { color: var(--blue); }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 3px; }
.box { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; margin: 26px 0; }
.box p:last-child { margin-bottom: 0; }
footer { border-top: 1px solid var(--line); margin-top: 54px; padding-top: 22px; color: var(--ink-soft); font-size: 14px; }
footer a { margin-right: 16px; }
.en { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 34px; }
.en h2:first-child { margin-top: 0; }