:root { color-scheme: light; font-family: "Noto Sans JP", "Yu Gothic", system-ui, sans-serif; color: #262b29; background: #f4f4ed; }
* { box-sizing: border-box; }
body { margin: 0; }
main { padding: 32px 20px 60px; margin: auto; }
.brand { font-size: 12px; font-weight: 800; color: #447567; letter-spacing: .18em; }
h1 { margin: 9px 0 4px; font-size: clamp(27px, 4vw, 40px); letter-spacing: .03em; }
.sub { margin: 0 0 12px; color: #66716c; font-size: 14px; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 12px; }
label { font-size: 14px; font-weight: 700; }
input { padding: 4px 8px; border: 1px solid #becbc4; border-radius: 9px; background: white; font: inherit; width: 120px; }
button { cursor: pointer; border: 1px solid #bfcfc5; border-radius: 9px; padding: 4px 8px; background: white; color: #253c32; font: inherit; font-weight: 700; }
.hide-difficulty { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; cursor: pointer; }
.hide-difficulty input { width: auto; margin: 0; padding: 0; accent-color: #2b6655; }
button:hover { background: #e6eee7; }
button:focus-visible, input:focus-visible { outline: 3px solid #7eb39c; outline-offset: 2px; }
button.primary { border-color: #2b6655; color: white; background: #2b6655; }
button.primary:hover { background: #1f5143; }
[hidden] { display: none !important; }
.catalog { max-width: 900px; padding: 18px; margin: 18px 0; border: 1px solid #d3ded6; border-radius: 12px; background: #fff; }
.catalog h2 { margin: 0 0 12px; font-size: 21px; }
.catalog-toolbar, .play-navigation { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 12px 0; }
.catalog-toolbar select { padding: 6px; border: 1px solid #becbc4; border-radius: 8px; font: inherit; }
.catalog-pages { display: flex; flex-wrap: wrap; gap: 5px; margin: 14px 0; }
.catalog-pages button { min-width: 34px; }
.catalog-pages button.selected { background: #2b6655; color: white; }
.catalog-grid { display: grid; grid-template-columns: repeat(10, minmax(0, 1fr)); gap: 6px; }
.catalog-item { padding: 8px 2px; font-size: 13px; font-variant-numeric: tabular-nums; }
.catalog-item.solved { background: #d5ecdf; border-color: #438568; color: #15513a; }
.catalog-item.solved:hover { background: #bde0cb; }
#catalog-message { color: #66716c; font-size: 13px; }
.play-navigation { margin-bottom: 14px; }
.play-navigation span { font-weight: 700; }
.play-navigation button:disabled { opacity: .4; cursor: default; }
.layout { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 28px; }
.board-frame { flex: 0 0 auto; width: max-content; background: #e7bd7c; border: 1px solid #ba925a; padding: 0; }
.board-tools { display: flex; gap: 6px; align-items: center; padding: 1px 1px 4px; }
.board-tools button { padding: 4px 8px; min-width: 39px; }
.board-tools button:disabled { opacity: .4; cursor: default; }
.board-tools output { min-width: 48px; font-size: 14px; font-variant-numeric: tabular-nums; text-align: center; font-weight: 700; }
canvas { display: block; width: 100%; max-width: none; height: auto; cursor: crosshair; touch-action: manipulation; }
.panel { flex: 1 1 280px; min-width: 240px; max-width: 550px; padding: 8px 0; }
.message { margin: 4px 0; min-height: 24px; padding: 4px 8px; background: #fff; border-left: 4px solid #4e816f; border-radius: 5px; line-height: 1.6; }
.message.win { border-left-color: #b18b37; background: #fff8e5; }
.message.lose { border-left-color: #be5e59; background: #fff1ef; }
.controls { display: flex; flex-wrap: wrap; gap: 9px; }
.move-record { margin: 12px 0 0; font-size: 13px; color: #66716c; overflow-wrap: anywhere; }
.move-record code { font-size: inherit; color: #262b29; user-select: text; }
.move-record-solution { color: #b14231; font-weight: 700; }
.hint { margin-top: 28px; color: #788179; font-size: 13px; line-height: 1.9; }
@media (max-width: 850px) { main { padding: 20px 12px 40px; } .panel { margin-top: 0; } }
@media (max-width: 480px) { .catalog { padding: 10px; } .catalog-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); } }