.material-player{background:#eef3ff;border:1px solid #d3ddf5;border-radius:12px;padding:16px}.material-player-label{display:block;font-size:14px;color:#334d80;margin-bottom:12px}.material-player audio{display:none}.material-player-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.material-player .audio-speed{display:flex;align-items:center;gap:8px;font-size:14px;margin:0}.audio-speed select{width:auto;padding:7px}.audio-timeline{display:flex;align-items:center;gap:12px;margin-top:12px}.audio-timeline input{flex:1;min-width:70px;padding:0;border:0;accent-color:#2449d8;height:24px;background:transparent}.audio-timeline span{white-space:nowrap;font-size:14px;font-variant-numeric:tabular-nums;color:#334d80}.material-player [role=alert]{font-size:14px;margin:12px 0 0}.material-player [data-slot=button]{min-height:42px;white-space:normal}@media(max-width:500px){.material-player{padding:12px}.audio-timeline{flex-wrap:wrap}.material-player-actions{gap:8px}}.official-practice{margin:22px 0;background:#f7f9ff}.official-practice summary,.original-lessons summary{cursor:pointer;font-weight:650}.official-practice summary svg{display:inline;vertical-align:middle;margin-left:8px}.official-practice h3{margin-top:20px}.official-links{display:flex;flex-wrap:wrap;gap:10px}.official-links a,.official-platform{display:inline-flex;align-items:center;gap:8px;border:1px solid #c7d2f0;border-radius:9px;padding:10px 13px;background:white;color:#2345b5;text-decoration:none}.official-links a:hover,.official-platform:hover{background:#eaf0ff}.official-practice .inline-note{margin:18px 0 0}.official-practice .inline-note a{text-decoration:underline;text-underline-offset:3px}.original-lessons{margin-top:28px}.original-lessons .lesson-grid{margin-top:18px}@media(max-width:600px){.official-links{flex-direction:column}.official-links a{justify-content:space-between}}