:root { --bg: #000; --fg: #aaa; --hi: #fff; --cyan: #5ff; --dim: #888; --yellow: #ff5; --line: #333; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 ui-monospace, "DejaVu Sans Mono", Menlo, Consolas, monospace; }
header { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; align-items: baseline; max-width: 44rem; margin: 0 auto; padding: 1rem 16px 0; }
header .home { color: var(--hi); font-weight: bold; letter-spacing: .08em; text-decoration: none; }
header nav a { margin-right: 1rem; }
main { max-width: 44rem; margin: 0 auto; padding: 1rem 16px 4rem; }
h1 { color: var(--hi); font-size: 1.5rem; line-height: 1.3; margin: 1rem 0 1rem; }
h2 { color: var(--yellow); font-size: 1.1rem; margin: 2.2rem 0 .6rem; }
h3 { color: var(--hi); font-size: 1rem; margin: 1.6rem 0 .4rem; }
a { color: var(--cyan); }
code, kbd { color: var(--hi); font-family: inherit; }
kbd { border: 1px solid var(--line); border-radius: 3px; padding: 0 .25em; }
pre { overflow-x: auto; border-left: 2px solid var(--line); padding: .25rem 0 .25rem 1rem; color: var(--hi); }
pre.help { color: var(--fg); font-size: .85rem; }
ol, ul { padding-left: 2rem; }
li { margin: .2rem 0; }
.soon { color: var(--dim); }
.soon span { font-size: .85rem; }
table { display: block; overflow-x: auto; border-collapse: collapse; margin: 1rem 0; }
th, td { border-bottom: 1px solid var(--line); padding: .3rem .8rem .3rem 0; text-align: left; vertical-align: top; }
th { color: var(--hi); }
img { max-width: 100%; height: auto; image-rendering: pixelated; vertical-align: top; }
/* A picture of a piece keeps its pixel size; a wide one scrolls rather than blurs. */
a.ans { display: block; width: fit-content; max-width: 100%; overflow-x: auto; margin: .25rem 0; }
a.ans img { max-width: none; outline: 1px solid var(--line); outline-offset: 0; }
details { margin: 1rem 0; }
summary { color: var(--hi); cursor: pointer; }
.checked { color: var(--dim); font-size: .85rem; margin-top: 3rem; border-top: 1px solid var(--line); padding-top: .5rem; }
.pager { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: 1rem; }
.bar { color: var(--cyan); white-space: pre; overflow: hidden; margin: 0 0 1.5rem; }
footer { max-width: 44rem; margin: 0 auto; padding: 0 16px 2rem; color: var(--dim); font-size: .85rem; }