/* Daily challenge (js/daily-challenge.js) + sequences trainer (js/seq-trainer.js).
   Same card language as the Zetamac game: site tokens, 14px cards, 44px targets. */
body{background:var(--bg-primary)}
.dr-main{padding:2rem 1rem 2.5rem;box-sizing:border-box}
.dr-head{max-width:36rem;margin:0 auto 1rem;text-align:center}
.dr-head h1{margin:0;font-size:1.6rem;font-weight:800;letter-spacing:-.02em;color:var(--text-bright,var(--text-primary))}
.dr-head p{margin:.4rem 0 0;font-size:.92rem;color:var(--text-secondary);line-height:1.5}
.dr-root{max-width:36rem;margin:0 auto;font-family:var(--font-sans,Inter,system-ui,sans-serif);font-variant-numeric:tabular-nums;color:var(--text-primary);scroll-margin-top:calc(var(--nav-height,64px) + 8px)}
.dr-root button:focus-visible,.dr-root a:focus-visible,.dr-root input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.dc-card,.sq-card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-xl,14px);padding:1.25rem;box-shadow:var(--shadow-sm);box-sizing:border-box}
.dc-top{display:flex;align-items:center;justify-content:space-between;gap:.6rem;flex-wrap:wrap}
.dc-kicker,.sq-kicker{font-size:.75rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text-secondary)}
.dc-streak{display:inline-flex;align-items:center;gap:.3rem;padding:.25rem .65rem;border-radius:999px;background:var(--accent-gold-light,rgba(245,183,49,.12));color:#a16207;font-size:.78rem;font-weight:700}
[data-theme="dark"] .dc-streak{color:var(--accent-gold,#f5b731)}
.dc-streak::before{content:"";width:.5rem;height:.5rem;border-radius:50%;background:var(--accent-gold,#f5b731)}
.dc-h{margin:.6rem 0 .7rem;font-size:1.2rem;font-weight:800;letter-spacing:-.01em;color:var(--text-bright,var(--text-primary))}
.dc-parts{list-style:none;margin:0 0 .8rem;padding:0;counter-reset:dc}
.dc-parts li{counter-increment:dc;position:relative;padding:.6rem 0 .6rem 2.4rem;border-top:1px solid var(--border-color);display:flex;flex-direction:column;gap:.15rem}
.dc-parts li::before{content:counter(dc);position:absolute;left:0;top:.65rem;width:1.7rem;height:1.7rem;border-radius:50%;background:var(--accent-light);color:var(--accent);font-weight:800;font-size:.85rem;display:flex;align-items:center;justify-content:center}
.dc-parts b{font-size:.95rem;color:var(--text-primary)}
.dc-parts span{font-size:.85rem;color:var(--text-secondary);line-height:1.45}
.dc-rule{font-size:.84rem;color:var(--text-muted);line-height:1.5;margin:.2rem 0 1rem}
.dc-done{margin:0;font-size:.9rem;font-weight:600;color:var(--accent-green,#16a34a)}
.dc-go,.sq-go{appearance:none;font:inherit;display:flex;align-items:center;justify-content:center;gap:.4rem;width:100%;min-height:3rem;border:0;border-radius:var(--radius-lg,10px);background:var(--accent);color:#fff;font-size:1.02rem;font-weight:700;cursor:pointer}
.dc-go:hover,.sq-go:hover{background:var(--accent-hover,#3a78e4)}
.dc-go--sm{width:auto;min-height:2.75rem;padding:0 1rem;font-size:.92rem}
.dc-ghost,.sq-ghost{appearance:none;font:inherit;min-height:2.75rem;padding:0 1rem;border-radius:var(--radius-lg,10px);border:1px solid var(--border-light);background:transparent;color:var(--text-secondary);font-size:.92rem;font-weight:600;cursor:pointer}
.dc-ghost:hover,.sq-ghost:hover{color:var(--text-primary);border-color:var(--accent-border)}
.dc-hud{display:flex;align-items:baseline;justify-content:space-between;gap:.6rem;font-size:.82rem;color:var(--text-secondary)}
.dc-hud__l{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dc-hud__t{font-size:1.3rem;font-weight:700;color:var(--text-primary)}
.dc-hud__t.dc-low{color:var(--color-hard,#f43f5e)}
.dc-hud__r{min-width:4.5rem;text-align:right}
.dc-hud__r b{font-size:1.2rem;color:var(--text-primary)}
.dc-bar{height:3px;margin:.6rem 0 0;border-radius:3px;background:var(--border-light);overflow:hidden}
.dc-bar i{display:block;height:100%;width:100%;background:var(--accent);transition:width .2s linear}
.dc-play{min-height:22rem}
.dc-q{text-align:center;font-size:3rem;font-weight:700;letter-spacing:-.02em;line-height:1.1;margin:2rem 0 1rem;color:var(--text-bright,var(--text-primary));white-space:nowrap;overflow:hidden}
.dc-q--mc{font-family:var(--font-mono,monospace);font-size:clamp(1.7rem,7vw,2.6rem);margin:.6rem 0 1.1rem;white-space:normal}
.dc-q--mc span{opacity:.45}
.dc-in{display:block;font:inherit;font-size:2rem;font-weight:600;width:7rem;max-width:100%;margin:0 auto;padding:.45rem .6rem;text-align:center;border:2px solid var(--border-light);border-radius:var(--radius-lg,10px);background:var(--bg-primary);color:var(--text-primary);outline:none;box-sizing:border-box}
.dc-in:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-glow)}
.dc-qn{margin:1.2rem 0 0;text-align:center;font-size:.8rem;font-weight:600;color:var(--text-muted)}
.dc-opts{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
.dc-opt{appearance:none;position:relative;min-height:3.6rem;border:1.5px solid var(--border-light);border-radius:12px;background:var(--bg-secondary);color:var(--text-primary);font:700 1.35rem/1 var(--font-mono,monospace);cursor:pointer}
.dc-opt span{position:absolute;top:.4rem;left:.55rem;font:600 .66rem/1 var(--font-sans,Inter,sans-serif);color:var(--text-muted)}
.dc-opt:hover{border-color:var(--accent)}
.dc-ok{background:rgba(34,197,94,.16);border-color:#22c55e;color:#15803d}
.dc-no{background:rgba(229,72,77,.14);border-color:#e5484d;color:#b91c1c}
.dc-ivq{margin:1.1rem 0 .6rem;font-size:1.15rem;font-weight:700;text-align:center;color:var(--text-bright,var(--text-primary))}
.dc-dots{display:block;width:100%;max-width:26rem;height:auto;margin:0 auto .8rem}
.dc-dots circle{fill:var(--accent)}
.dc-dots__box{fill:var(--bg-secondary);stroke:var(--border-light)}
.dc-ivf{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
.dc-ivf label{display:flex;flex-direction:column;gap:.3rem;font-size:.78rem;font-weight:600;color:var(--text-secondary)}
.dc-ivf input{font:inherit;font-size:16px;font-weight:600;min-height:2.9rem;padding:0 .7rem;border:1px solid var(--border-light);border-radius:var(--radius-md,6px);background:var(--bg-card);color:var(--text-primary);box-sizing:border-box}
.dc-ivf input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.dc-ivf .dc-go{grid-column:1/-1;margin-top:.2rem}
.dc-ivmsg{grid-column:1/-1;margin:0;min-height:1.2em;font-size:.8rem;color:var(--color-hard,#f43f5e)}
.dc-total{display:flex;align-items:baseline;gap:.6rem;margin:.6rem 0 .8rem}
.dc-total b{font-size:3.4rem;font-weight:800;line-height:1;color:var(--accent);letter-spacing:-.02em}
.dc-total span{font-size:.85rem;color:var(--text-muted)}
.dc-split{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}
.dc-split div{display:flex;flex-direction:column;gap:.15rem;padding:.6rem .65rem;border-radius:var(--radius-lg,10px);background:var(--bg-secondary);border:1px solid var(--border-color)}
.dc-split b{font-size:1.25rem;font-weight:800;color:var(--text-primary)}
.dc-split span{font-size:.72rem;color:var(--text-muted);line-height:1.3}
.dc-ivans{margin:.6rem 0 0;font-size:.82rem;color:var(--text-secondary)}
.dc-share{margin:1rem 0 0;padding:.8rem;border-radius:var(--radius-lg,10px);border:1px dashed var(--border-light)}
.dc-share__txt{margin:0 0 .6rem;font:500 .82rem/1.5 var(--font-mono,monospace);white-space:pre-wrap;word-break:break-word;color:var(--text-secondary);background:none;border:0;padding:0}
.dc-share__btns{display:flex;gap:.5rem;flex-wrap:wrap}
.dc-next{margin:1rem 0 0;font-size:.84rem;color:var(--text-muted)}
.dc-linkbtn{appearance:none;font:inherit;padding:.6rem .1rem;min-height:2.75rem;border:0;background:none;color:var(--text-secondary);text-decoration:underline;text-underline-offset:2px;cursor:pointer}
.dc-more{display:flex;flex-wrap:wrap;gap:.4rem;margin:.6rem 0 0}
.dc-more a{display:inline-flex;align-items:center;min-height:2.75rem;padding:0 .8rem;border-radius:var(--radius-lg,10px);border:1px solid var(--border-light);color:var(--text-secondary);font-size:.86rem;font-weight:600;text-decoration:none}
.dc-more a:hover{color:var(--text-primary);border-color:var(--accent-border)}
/* ---- sequences trainer ---- */
.sq-lbl{font-size:.75rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--text-secondary);margin:0 0 .45rem}
.sq-seg{display:grid;grid-template-columns:repeat(3,1fr);gap:.4rem;margin:0 0 1rem}
.sq-seg--2{grid-template-columns:repeat(2,1fr)}
.sq-opt{appearance:none;font:inherit;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.1rem;min-height:2.9rem;padding:.4rem;border-radius:var(--radius-lg,10px);border:1px solid var(--border-light);background:transparent;color:var(--text-secondary);font-size:.9rem;font-weight:600;cursor:pointer}
.sq-opt span{font-size:.72rem;font-weight:500;color:var(--text-muted)}
.sq-opt[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-light);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.sq-opt[aria-pressed="true"] span{color:inherit;opacity:.8}
.sq-note{font-size:.82rem;color:var(--text-muted);line-height:1.5;margin:-.4rem 0 1rem}
.sq-best{margin:.6rem 0 0;font-size:.82rem;color:var(--text-muted);text-align:center}
.sq-best b{color:var(--text-primary)}
.sq-seq{font:700 clamp(1.25rem,5.4vw,1.9rem)/1.5 var(--font-mono,monospace);text-align:center;margin:1.2rem 0 1.1rem;word-break:break-word;color:var(--text-bright,var(--text-primary))}
.sq-seq .imq-mark{color:var(--accent)}
.sq-seq sup,.sq-o sup,.sq-ex sup{font-size:.62em}
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;line-height:1.05;font-size:.82em;margin:0 .1em}
.frac span:first-child{border-bottom:2px solid currentColor;padding:0 .15em}
.sq-opts{display:grid;grid-template-columns:repeat(5,1fr);gap:.45rem}
.sq-o{appearance:none;position:relative;min-height:3.4rem;padding:.4rem .2rem;border:1.5px solid var(--border-light);border-radius:12px;background:var(--bg-secondary);color:var(--text-primary);font:700 1.05rem/1.2 var(--font-mono,monospace);cursor:pointer}
.sq-o i{position:absolute;top:.3rem;left:.45rem;font:600 .62rem/1 var(--font-sans,Inter,sans-serif);font-style:normal;color:var(--text-muted)}
.sq-o:hover{border-color:var(--accent)}
.sq-o.is-ok{background:rgba(34,197,94,.16);border-color:#22c55e;color:#15803d}
.sq-o.is-no{background:rgba(229,72,77,.14);border-color:#e5484d;color:#b91c1c}
.sq-row{display:flex;justify-content:space-between;align-items:center;gap:.5rem;margin:.9rem 0 0;flex-wrap:wrap}
.sq-ex{margin:1rem 0 0;padding:.8rem .9rem;border-radius:var(--radius-lg,10px);background:var(--accent-light);font-size:.9rem;line-height:1.6;color:var(--text-primary)}
.sq-ex__h{display:block;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--accent);margin-bottom:.2rem}
.sq-ex--no .sq-ex__h{color:var(--color-hard,#e5484d)}
.sq-ex--ok .sq-ex__h{color:var(--accent-green,#16a34a)}
.sq-sum{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;margin:.6rem 0 0}
.sq-sum div{display:flex;flex-direction:column;gap:.1rem;padding:.6rem .7rem;border-radius:var(--radius-lg,10px);background:var(--bg-secondary);border:1px solid var(--border-color)}
.sq-sum b{font-size:1.4rem;font-weight:800}
.sq-sum span{font-size:.72rem;color:var(--text-muted)}
.sq-fam{width:100%;border-collapse:collapse;font-size:.86rem;margin:1rem 0 0}
.sq-fam caption{caption-side:top;text-align:left;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text-secondary);padding:0 0 .4rem}
.sq-fam th,.sq-fam td{padding:.35rem 0;border-bottom:1px solid var(--border-color);text-align:right}
.sq-fam th:first-child{text-align:left;font-weight:500;color:var(--text-secondary)}
.sq-rev{list-style:none;margin:1rem 0 0;padding:0}
.sq-rev li{padding:.7rem 0;border-top:1px solid var(--border-color);margin:0}
.sq-rev__h{display:flex;justify-content:space-between;gap:.5rem;font-size:.75rem;color:var(--text-muted);margin-bottom:.2rem}
.sq-rev__h b.ok{color:var(--accent-green,#16a34a)}
.sq-rev__h b.no{color:var(--color-hard,#e5484d)}
.sq-rev__s{font:700 1rem/1.5 var(--font-mono,monospace)}
.sq-rev__e{font-size:.84rem;line-height:1.55;color:var(--text-secondary);margin-top:.2rem}
/* article content under the tools */
.dr-doc{max-width:42rem;margin:2.2rem auto 0}
@media (max-width:560px){
.dr-main{padding:1.1rem 1rem 2rem}
.dr-head h1{font-size:1.35rem}
.dc-card,.sq-card{padding:1rem .9rem}
.dc-q{font-size:2.6rem;margin:1.5rem 0 .9rem}
.dc-split{grid-template-columns:1fr 1fr 1fr}
.dc-split b{font-size:1.1rem}
.sq-opts{grid-template-columns:repeat(3,1fr)}
.sq-sum b{font-size:1.2rem}
}
@media (max-width:360px){.sq-opts{grid-template-columns:repeat(2,1fr)}.dc-ivf{grid-template-columns:1fr}}