:root { color-scheme: light dark; --fg: #111; --bg: #fff; --line: #111; --soft: #eee; --link: #0033aa; --err: #a00; }
@media (prefers-color-scheme: dark) { :root { --fg: #eee; --bg: #151515; --line: #ddd; --soft: #262626; --link: #8fb3ff; --err: #ff8a8a; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 Geneva, Verdana, "DejaVu Sans", sans-serif; }
header { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline; padding: .75rem 1rem;
         border-bottom: 2px solid var(--line); background: var(--soft); }
.logo { font-weight: bold; font-size: 1.2rem; text-decoration: none; color: var(--fg); }
nav a { margin-right: 1rem; }
a { color: var(--link); }
main { max-width: 42rem; margin: 0 auto; padding: 1rem 1rem 3rem; }
footer { max-width: 42rem; margin: 0 auto; padding: 1rem; font-size: .85rem; opacity: .7; }
h1 { margin-top: 1.2rem; } h2 { margin-top: 2rem; font-size: 1.15rem; }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-variant-numeric: tabular-nums; }
th, td { border-bottom: 1px solid var(--line); padding: .35rem .5rem; text-align: right; }
th.l, td.l { text-align: left; }
th { border-bottom-width: 2px; }
input { font: inherit; padding: .3rem .5rem; border: 2px solid var(--line); background: var(--bg); color: var(--fg); }
button { font: inherit; padding: .35rem 1rem; border: 2px solid var(--line); border-radius: 6px; background: var(--soft); color: var(--fg); cursor: pointer; }
.key { font: bold 1.6rem/1.3 Monaco, Menlo, "Courier New", monospace; letter-spacing: .05em; padding: .8rem 1rem;
       border: 3px double var(--line); text-align: center; background: var(--soft); user-select: all; }
.error { color: var(--err); font-weight: bold; }
.note { font-size: .9rem; opacity: .85; }
.big { font-size: 1.3rem; }
.hp { position: absolute; left: -9999px; }