.chapter-demo{min-width:0;margin:28px 0}.chapter-screen{aspect-ratio:16/9;background:#0d1526;border:1px solid #6d7490;border-radius:14px;min-height:200px;position:relative;overflow:hidden}.chapter-screen iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.chapter-cover{cursor:pointer;background:#0d1526;border:0;width:100%;height:100%;padding:0;display:block;position:relative}.chapter-cover img{object-fit:contain;opacity:.9;width:100%;height:100%;display:block}.chapter-cover>span{color:#151d36;background:#fff;border-radius:8px;justify-content:center;align-items:center;gap:12px;width:max-content;max-width:90%;min-height:48px;padding:12px 20px;font:700 16px/1.3 Arial,sans-serif;display:flex;position:absolute;bottom:20px;left:50%;transform:translate(-50%);box-shadow:0 4px 20px #0006}.chapter-choices{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px;display:grid}.chapter-choices button{text-align:left;cursor:pointer;color:#292443;background:#faf8ff;border:1px solid #bcb9dc;border-radius:10px;flex-direction:column;align-items:flex-start;gap:8px;padding:18px;font:15px/1.55 Arial,sans-serif;display:flex}.chapter-choices button:hover{background:#ede9ff;border-color:#5545a8}.chapter-choices button[aria-pressed=true]{color:#fff;background:#34226b;border-color:#34226b}.chapter-choices button strong{font-size:18px;line-height:1.3}.chapter-time{letter-spacing:.05em;font-size:12px;font-weight:800}.chapter-demo .chapter-status{color:#5c5671;max-width:90ch;margin:14px 0;font:13px/1.65 Arial,sans-serif}.chapter-status a{color:#4c3488;font-weight:700}.chapter-demo :is(a,button):focus-visible{outline-offset:4px;outline:3px solid #974483}@media (max-width:700px){.chapter-choices{grid-template-columns:1fr;gap:8px}.chapter-choices button{grid-template-columns:48px 1fr;gap:4px 12px;padding:14px;display:grid}.chapter-choices button>span:last-child{grid-column:2}.chapter-cover>span{padding:10px 14px;font-size:14px;bottom:12px}}