:root {
  --bg: #fff;
  --text: #101215;
  --muted: #5d636b;
  --line: #e3e6ea;
  --teal: #3fc1d9;
  --link: #0a7489;
  --mark: rgba(63, 193, 217, 0.28);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0e;
    --text: #eceef1;
    --muted: #9aa1aa;
    --line: #24272c;
    --link: #3fc1d9;
    --mark: rgba(63, 193, 217, 0.22);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  border-top: 6px solid var(--teal);
}
main { max-width: 640px; margin: 0 auto; padding: 44px 20px 56px; }
a { color: var(--link); text-underline-offset: 3px; }
h1 { font-size: 2.5rem; line-height: 1.05; margin: 0 0 10px; letter-spacing: -0.03em; }
h2 { font-size: 1.1rem; margin: 34px 0 6px; }
p { margin: 0 0 14px; }
.sub { font-size: 1.15rem; color: var(--muted); margin: 0 0 26px; }
mark { background: linear-gradient(transparent 55%, var(--mark) 55%); color: inherit; padding: 0 2px; }
ul { padding-left: 20px; margin: 0 0 16px; }
li { margin-bottom: 8px; }
.soon { display: inline-block; margin: 6px 0 4px; font-size: 0.95rem; color: var(--muted); }
.soon b { color: var(--text); }
.careful { margin-top: 34px; padding: 14px 16px; border-left: 3px solid var(--teal); background: var(--mark); font-size: 0.95rem; }
.q { font-weight: 600; margin-bottom: 2px; }
.note { color: var(--muted); font-size: 0.92rem; }
footer { max-width: 640px; margin: 0 auto; padding: 16px 20px 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.92rem; }
footer a { color: inherit; margin-right: 14px; }