/* Updated 2026-10-21 11:25 PM EDT - How to play box styles */
:root {
  color-scheme: light;
  --page: #fbf7f2; --card: #ffffff; --ink: #2a2622; --ink2: #6b645b; --line: #ece4d8;
  --mint: #dff3e8; --mintInk: #1e6b46; --peach: #fde6da; --peachInk: #9a4722;
  --sky: #e1edfb; --skyInk: #1f4f86; --lav: #ece7fb; --lavInk: #4b3b91; --butter: #fdf3cf; --butterInk: #7a5b00;
  --code: #fffdf8;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--page); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 1040px; margin: 0 auto; padding: 22px 16px 60px; }
h1 { font-size: 26px; margin: 0; }
h2 { font-size: 19px; margin: 0 0 8px; }
.top { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.stats { display: flex; gap: 8px; flex-wrap: wrap; }
.pill { border-radius: 99px; padding: 5px 12px; font-weight: 650; font-size: 14px; }
.mint { background: var(--mint); color: var(--mintInk); } .peach { background: var(--peach); color: var(--peachInk); }
.sky { background: var(--sky); color: var(--skyInk); } .lav { background: var(--lav); color: var(--lavInk); }
.butter { background: var(--butter); color: var(--butterInk); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin-bottom: 14px; }
.grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 14px; }
@media (max-width: 820px) { .grid { grid-template-columns: 1fr; } }
textarea.code { width: 100%; min-height: 340px; font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--code); color: var(--ink);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px; resize: vertical; tab-size: 4; }
textarea.plan { width: 100%; min-height: 120px; font: 15px/1.5 system-ui, sans-serif; border: 1px solid var(--line); border-radius: 12px; padding: 10px; background: var(--code); }
button { font: inherit; font-weight: 650; border: 0; border-radius: 12px; padding: 10px 16px; cursor: pointer; background: var(--sky); color: var(--skyInk); }
button.go { background: #5b8def; color: #fff; }
button:disabled { opacity: .45; cursor: default; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 10px; }
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding: 7px 10px; border-radius: 10px; margin-bottom: 5px; font-size: 14.5px; display: flex; gap: 8px; align-items: flex-start; }
.checks li.ok { background: var(--mint); color: var(--mintInk); }
.checks li.no { background: #faf6f0; color: var(--ink2); }
.checks li .mark { font-weight: 800; width: 18px; flex: none; }
.hint { background: var(--butter); color: var(--butterInk); border-radius: 12px; padding: 10px 12px; margin-top: 8px; font-size: 14.5px; }
.advice { background: var(--peach); color: var(--peachInk); border-radius: 12px; padding: 10px 12px; margin-top: 8px; font-size: 14.5px; }
.cheer { background: var(--mint); color: var(--mintInk); border-radius: 12px; padding: 10px 12px; margin-top: 8px; font-weight: 600; }
.muted { color: var(--ink2); font-size: 14px; }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 12px; display: none; z-index: 9; }
select { font: inherit; padding: 6px 8px; border-radius: 10px; border: 1px solid var(--line); background: var(--code); }
code { font-family: ui-monospace, Menlo, monospace; background: var(--lav); color: var(--lavInk); padding: 1px 5px; border-radius: 6px; font-size: .92em; }
nav { font-size: 14px; margin-bottom: 10px; color: var(--ink2); } nav a { color: var(--skyInk); }
[hidden] { display: none !important; }
.playbtn { background: var(--mint); color: var(--mintInk); padding: 3px 12px; border-radius: 99px; font-weight: 700; text-decoration: none; }
.playbtn:hover { filter: brightness(.95); }
.problem { background: var(--mint); color: var(--mintInk); border-radius: 14px; padding: 10px 14px; margin-bottom: 14px; }
.problem summary { cursor: pointer; font-size: 14px; margin-top: 4px; }
.problem ul, .problem ol { margin: 4px 0 8px; padding-left: 22px; } .problem p { margin: 8px 0 4px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.cards a.card { display: block; text-decoration: none; color: var(--ink); margin: 0; } .cards a.card:hover { border-color: #5b8def; }
.cards a.card b { display: block; margin-bottom: 4px; }
.problem pre.starter { background: var(--code); color: var(--ink); border-radius: 10px; padding: 10px; overflow-x: auto; font: 13px/1.35 ui-monospace, Menlo, monospace; margin: 4px 0 6px; }
.howto { background: var(--butter); color: var(--ink); border-radius: 14px; padding: 10px 16px; margin-bottom: 14px; }
.howto summary { cursor: pointer; font-weight: 700; color: var(--butterInk); font-size: 16px; }
.howto ol { margin: 8px 0 4px; padding-left: 22px; } .howto ol li { margin-bottom: 3px; }
.howto .words { margin: 8px 0 2px; font-weight: 700; color: var(--butterInk); font-size: 14px; }
.howto ul { margin: 0 0 4px; padding-left: 20px; font-size: 14px; }
.wrongbox { outline: 3px solid #ec835a !important; }