/* Rubik's Cube lessons and algorithm pages: case pictures, the step-by-step player, lesson layout, the repeat calculator. */
.cube-page{--c:var(--c-cubing);--c-soft:var(--c-cubing-soft);--c-ink:var(--c-cubing-ink)}

/* top-view case pictures */
.cube-top{display:block;width:100%;height:auto}
.cube-cases{display:grid;grid-template-columns:repeat(auto-fill,minmax(172px,1fr));gap:14px}
.cube-case{display:grid;gap:6px;justify-items:center;text-align:center;padding:16px 14px 14px;border-radius:var(--r-lg,18px);background:var(--card);border:1px solid var(--line);text-decoration:none;color:inherit;transition:transform .2s var(--ease,ease),box-shadow .2s,border-color .2s}
.cube-case:hover{transform:translateY(-3px);border-color:var(--c);box-shadow:0 14px 28px -18px rgba(29,40,86,.45)}
.cube-case .cube-top{width:min(112px,70%)}
.cube-case b{font:700 16px/1.25 var(--sans);color:var(--ink)}
.cube-case code{font:600 11.5px/1.45 ui-monospace,Menlo,Consolas,monospace;color:var(--c-ink);overflow-wrap:anywhere}
.cube-case small{color:var(--mute);font-weight:600}
.cube-case.more{align-content:center;background:var(--c-soft);border-style:dashed;min-height:170px}.cube-case.more span{font-size:14px;color:var(--ink-2)}
.cube-case-row{display:flex;flex-wrap:wrap;gap:18px;margin:18px 0}
.cube-case-fig{margin:0;width:150px;display:grid;gap:8px;justify-items:center;text-align:center}
.cube-case-fig .cube-top{width:112px}
.cube-case-fig figcaption{display:grid;gap:3px;font-size:13.5px;line-height:1.4;color:var(--ink-2)}.cube-case-fig figcaption b{font-size:15px;color:var(--ink)}
.cube-case-fig code{font:600 11px/1.4 ui-monospace,Menlo,Consolas,monospace;color:var(--c-ink);overflow-wrap:anywhere}

/* an algorithm page: picture beside the moves */
.cube-algo{display:grid;grid-template-columns:minmax(180px,260px) minmax(0,1fr);gap:clamp(18px,3vw,40px);align-items:center;padding:clamp(18px,3vw,30px);border-radius:var(--r-xl,24px);background:var(--card);border:1px solid var(--line);border-top:5px solid var(--c)}
.cube-algo-pic figure{margin:0;display:grid;gap:8px;justify-items:center;text-align:center}.cube-algo-pic .cube-top{width:min(220px,100%)}.cube-algo-pic figcaption{font-size:13px;color:var(--mute)}
.cube-algo-text h2{margin-top:0}
.alg-line{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0}
code.alg,.alg-line code{display:inline-block;padding:10px 14px;border-radius:12px;background:var(--c-soft);color:var(--c-ink);font:700 clamp(14px,1.8vw,18px)/1.5 ui-monospace,Menlo,Consolas,monospace;overflow-wrap:anywhere}
.cube-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin:14px 0 0}.cube-facts div{padding:10px 12px;border-radius:12px;background:var(--c-soft)}.cube-facts dt{font:700 11px var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--c-ink)}.cube-facts dd{margin:2px 0 0;font-weight:700}

/* the step-by-step player */
.cube-player{margin:20px 0;padding:clamp(14px,2.5vw,22px);border-radius:var(--r-lg,18px);background:var(--card);border:1px solid var(--line);display:grid;gap:12px}
.cube-player figcaption{display:grid;gap:2px}.cube-player figcaption span{font-size:14px;color:var(--ink-2)}
.cp-stage{display:grid;gap:10px;border-radius:14px;background:radial-gradient(120% 90% at 50% 0%,#f7f3ea,#ebe3d2);padding:10px}
.cp-view{min-height:clamp(300px,58vw,390px);padding:26px 0}
.cp-nojs{margin:0;padding:18px;font:600 14px/1.5 ui-monospace,Menlo,Consolas,monospace;color:var(--c-ink)}
.cp-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center}
.cp-speed{display:inline-flex;gap:6px;align-items:center;font-size:13.5px;color:var(--ink-2)}.cp-speed select{padding:6px 8px;border-radius:8px;border:1px solid var(--line-2);background:#fff;font:inherit}
.cp-status{margin:0;text-align:center;font-weight:600;color:var(--c-ink);min-height:1.5em}
.cp-moves{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.cp-moves li{padding:6px 10px;border-radius:9px;background:var(--paper-2);font:700 14px ui-monospace,Menlo,Consolas,monospace;color:var(--ink-2);cursor:pointer;transition:background .15s,color .15s}
.cp-moves li.done{background:var(--c-soft);color:var(--c-ink)}.cp-moves li[aria-current]{background:var(--c);color:#fff}
.cube-player i.chg{outline:3px solid var(--indigo);outline-offset:-3px;animation:cpPulse .8s ease-out 1}
@keyframes cpPulse{from{outline-color:var(--saffron);filter:brightness(1.25)}to{outline-color:transparent;filter:none}}
@media(prefers-reduced-motion:reduce){.cube-player i.chg{animation:none}}

/* lesson layout */
.cube-lesson{display:grid;grid-template-columns:minmax(0,230px) minmax(0,1fr);gap:clamp(20px,4vw,48px);align-items:start;padding-block:clamp(20px,3vw,36px)}
.cube-side{position:sticky;top:96px;display:grid;gap:12px}
.cube-steps ol{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.cube-steps a{display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:center;padding:8px 10px;border-radius:12px;text-decoration:none;color:var(--ink-2);font-weight:600;font-size:14.5px;line-height:1.3;border:1px solid transparent}
.cube-steps a:hover{background:var(--c-soft);color:var(--c-ink)}
.cube-steps [aria-current] a{background:var(--c-soft);border-color:var(--c);color:var(--c-ink)}
.cube-steps a.is-done .cs-n{background:var(--c);color:#fff}
.cs-n{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--paper-2);font:800 13px var(--sans);color:var(--ink-2)}
.cube-main{min-width:0}
.cube-goal{margin:0 0 22px;padding:14px 18px;border-radius:14px;background:var(--c-soft);border-left:5px solid var(--c);color:var(--c-ink)}
.cube-goal b{display:block;font:700 11px var(--sans);letter-spacing:.12em;text-transform:uppercase;margin-bottom:3px}
.cube-sec{margin-bottom:30px}.cube-sec h2{font-size:clamp(22px,2.6vw,30px);margin:0 0 10px}.cube-sec h3{margin:20px 0 6px;font-size:17px}
.cube-sec code,.cube-main p code,.cube-main li code{padding:2px 7px;border-radius:7px;background:var(--c-soft);color:var(--c-ink);font:700 .92em ui-monospace,Menlo,Consolas,monospace;white-space:nowrap}
.cube-main ul,.cube-main ol{padding-left:1.2em}
.cube-table{width:100%;border-collapse:collapse;margin:10px 0 14px}.cube-table th,.cube-table td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:15px}.cube-table th{font:700 12px var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--c-ink);background:var(--c-soft)}
.cube-done-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:6px 0 18px}.cube-done-row .btn.is-on{--bg:var(--c-soft);--fg:var(--c-ink);--bd:var(--c);box-shadow:none}
.cube-prevnext{display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap;margin:18px 0}
@media(max-width:860px){.cube-lesson{grid-template-columns:1fr}.cube-side{position:static}.cube-steps ol{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.cube-algo{grid-template-columns:1fr;justify-items:center;text-align:left}.cube-algo-text{width:100%}}

/* hub and overview cards */
.cube-step-cards{list-style:none;margin:18px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.cube-step-cards .w-card{position:relative;height:100%}
.cube-step-n{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--c);color:#fff;font:800 18px var(--sans);flex:none}
.cube-done{position:absolute;top:14px;right:14px;font:700 12px var(--sans);color:var(--c-ink);background:var(--c-soft);padding:3px 9px;border-radius:999px}
.cube-overview{display:grid;gap:14px;margin-top:20px}
.cube-overview-step{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start;padding:18px 20px;border-radius:var(--r-lg,18px);background:var(--card);border:1px solid var(--line)}
.cube-overview-step h2{margin:0 0 6px;font-size:22px}.cube-overview-step h2 a{text-decoration:none;color:inherit}.cube-overview-step p{margin:0 0 6px}
.cube-split{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.cube-split.two{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.cube-bignum{display:grid;gap:2px;margin:16px 0;padding:18px 22px;border-radius:16px;background:var(--c-ink);color:#fff;text-align:center}
.cube-bignum b{font:500 clamp(26px,5.5vw,48px)/1.1 var(--serif);overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.cube-bignum span{color:#CFE6E1;font-weight:600}

/* the repeat calculator */
.cube-order{display:grid;gap:12px;padding:clamp(14px,2.5vw,22px);border-radius:var(--r-lg,18px);background:var(--card);border:1px solid var(--line)}
.cube-order-form{display:flex;gap:10px;flex-wrap:wrap;align-items:end}.cube-order-form label{flex:1 1 260px;display:grid;gap:4px;font-weight:600}
.cube-order-form input{padding:12px 14px;border-radius:12px;border:1.5px solid var(--line-2);font:600 16px ui-monospace,Menlo,Consolas,monospace;background:#fff}
.cube-order-examples{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:0;font-size:14px}.cube-order-examples .btn{font:600 12.5px ui-monospace,Menlo,Consolas,monospace}

/* glossary */
.cube-gloss h2{margin:26px 0 6px;color:var(--c-ink)}.cube-gloss dl{margin:0;display:grid;gap:12px}.cube-gloss dt{font:700 17px var(--sans)}.cube-gloss dd{margin:2px 0 0;color:var(--ink-2)}
.cube-gloss dt:target{background:var(--saffron-soft);border-radius:8px;padding:2px 8px;margin-left:-8px}