.pinyin-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:18px 0}.pinyin-controls select{font:inherit;padding:8px;border:1px solid var(--line);border-radius:8px;background:white}.pinyin-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:24px}.pinyin-lesson{display:flex;flex-direction:column;gap:8px;text-align:left;padding:20px;background:#fffdf7;color:var(--ink);border:1px solid var(--line);border-radius:12px}.pinyin-lesson[aria-pressed=true]{border-color:var(--red);box-shadow:inset 0 0 0 1px var(--red)}.pinyin-lesson span,.pinyin-lesson small{font-size:12px;color:var(--muted)}.pinyin-lesson strong{font-size:17px}.pinyin-panel{margin-top:24px;padding:28px;border:1px solid var(--line);border-radius:14px;background:#fffdf7;scroll-margin-top:120px}.pinyin-heading{display:flex;justify-content:space-between;gap:16px;align-items:start}.pinyin-heading h3{margin:6px 0;font-size:24px}.pinyin-tips{background:var(--green);padding:16px 20px;border-radius:10px;margin:20px 0}.pinyin-tips p{padding-left:14px;border-left:2px solid #9aa881;font-size:14px}.pinyin-examples{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.pinyin-example{border:1px solid var(--line);padding:18px;border-radius:10px}.pinyin-example strong{display:block;font-size:25px;color:var(--red);overflow-wrap:anywhere}.pinyin-example span{font:26px/1.5 serif;display:block}.pinyin-example p{font-size:13px}.pinyin-example button{font-size:13px;padding:8px 12px}.pinyin-question{min-width:0;border:1px solid var(--line);border-radius:10px;padding:16px;margin:18px 0}.pinyin-question legend{font-weight:600;padding:0 6px}.pinyin-options{display:flex;flex-wrap:wrap;gap:8px}.pinyin-options button{border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);padding:10px 16px}.pinyin-options button.correct{background:#e0ecd7;border-color:#64935a}.pinyin-options button.wrong{background:#f7deda;border-color:var(--red)}.pinyin-options button:disabled{opacity:1;cursor:default}.pinyin-question p{font-size:14px}@media(max-width:760px){.pinyin-examples{grid-template-columns:repeat(2,minmax(0,1fr))}.pinyin-panel{padding:18px}.pinyin-heading{flex-direction:column}}@media(max-width:460px){.pinyin-grid,.pinyin-examples{grid-template-columns:1fr}}