.ch-course{max-width:52rem;line-height:1.8;color:#cbd5e1}
.ch-course h1{font-size:2rem;line-height:1.3;color:#f1f5f9;margin:1rem 0}
.ch-course h2{font-size:1.3rem;line-height:1.5;color:#f1f5f9;margin:.3rem 0 .8rem}
.ch-course p{margin:.75rem 0}.ch-course a{color:#67e8f9;text-underline-offset:.2em}
.ch-panel{padding:1.25rem;margin:1.25rem 0;border:1px solid #334155;border-radius:.75rem;background:var(--reading-surface,#01040e)}
.ch-button{display:inline-block;border:1px solid #475569;border-radius:.4rem;padding:.4rem .75rem;margin:.3rem .3rem .3rem 0;color:#e2e8f0;background:var(--reading-surface,#01040e);cursor:pointer;font-size:.95rem}
.ch-button:hover,.ch-button:focus-visible{border-color:#67e8f9;outline:2px solid #67e8f9;outline-offset:2px}
.ch-word{padding:1rem 0;border-top:1px solid #334155}.ch-word-prompt,.ch-reading{font-size:1.25rem}
.ch-option{display:block;padding:.4rem 0}.ch-writing{width:100%;padding:.75rem;border:1px solid #475569;border-radius:.4rem;background:var(--reading-surface,#01040e);color:inherit}
.ch-course summary{cursor:pointer;text-decoration:underline;text-underline-offset:.2em}.ch-course details{margin:.8rem 0}
.ch-unit-list{padding-left:1.4rem;list-style:decimal}.ch-course ul{padding-left:1.4rem;list-style:disc}
.ch-word-help[hidden],.ch-word-review[hidden]{display:none}
.lx-self-model[hidden]{display:none}.lx-self-model{padding:1rem;border:1px solid #475569;background:var(--reading-surface,#01040e)}
.lx-audio-status{display:block;font-size:.9rem;color:inherit}
html[data-theme="light"] .ch-course{color:#334155}
html[data-theme="light"] .ch-course h1,html[data-theme="light"] .ch-course h2{color:#0f172a}
html[data-theme="light"] .ch-course a{color:#075985}
html[data-theme="light"] .ch-button{color:#0f172a;border-color:#64748b}
html[data-theme="light"] .ch-button:hover,html[data-theme="light"] .ch-button:focus-visible{outline-color:#075985;border-color:#075985}
@media(max-width:480px){.ch-panel{padding:1rem}.ch-course h1{font-size:1.6rem}.ch-course{overflow-wrap:anywhere}}
@media print{nav,header,footer,.ch-button,textarea,.ch-word-review,form{display:none!important}.ch-course{max-width:none;color:#000}.ch-panel{border-color:#aaa;background:#fff;break-inside:avoid}.ch-course h1,.ch-course h2,.ch-course a{color:#000}.ch-word-help[hidden]{display:block}details> :not(summary){display:block!important}details summary{font-weight:bold;text-decoration:none}.ch-course p{margin:.4rem 0}}

.ch-placement-choice.is-selected{font-weight:600;border-color:currentColor}
.ch-placement-choice.is-selected::before{content:"✓ ";font-weight:700}
.ch-course h2.ch-character{font-size:2.5rem;line-height:1.3}
.ch-stroke-target{width:260px;max-width:100%;min-height:260px;border:1px solid #475569;border-radius:.4rem;background:var(--reading-surface,#01040e);touch-action:none}
.ch-stroke-target svg{display:block;max-width:100%}
.ch-stroke-player [data-stroke-controls][hidden]{display:none}
.ch-stroke-player button:disabled{opacity:.6;cursor:wait}