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rgba(17,19,37,.12);background:var(--paper);color:var(--ink);font:inherit;cursor:pointer}.group[aria-pressed=true]{border-color:var(--ground);box-shadow:inset 0 0 0 1px var(--ground)}.group-name{font-size:14px;font-weight:700;line-height:1.2}.group-signs{font-size:19px;line-height:1.1;letter-spacing:.04em}.group[aria-pressed=true] .group-name:before{content:"✓ ";color:var(--ground)}.meter{display:block;height:8px;border-radius:var(--radius-pill);background:#e7e8ef;overflow:hidden}.meter>span{display:block;height:100%;width:var(--fill, 0%);border-radius:inherit;background:var(--ground)}.meter-text{font-size:13px;font-weight:600;color:#111325b3}.study{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(52px,1fr));gap:8px}.study .tile-sign{font-size:24px}.study .tile-pinyin{font-size:10px}.prompt{min-height:176px;display:grid;place-items:center;gap:8px;text-align:center;padding:8px 0;border-radius:22px;background:#f3f1ec}.prompt-text{font-size:15px;font-weight:700;color:#111325b8}.prompt-sign{width:132px;height:132px;filter:var(--shadow-cut)}.prompt-big{font-size:clamp(44px,14vw,64px);font-weight:700;line-height:1.1}.prompt-sub{font-size:17px;color:#111325bf}.big-play{width:88px;height:88px;border-radius:50%;border:0;cursor:pointer;background:var(--ground);display:grid;place-items:center;box-shadow:inset 0 3px #ffffff4d,0 8px 18px #080e5a52;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.big-play:before{content:"";margin-left:6px;border-style:solid;border-width:15px 0 15px 25px;border-color:transparent transparent transparent var(--paper)}.big-play.saying:before{width:22px;height:22px;margin:0;border:0;border-radius:4px;background:var(--paper)}.big-play.popped{animation:pop-tile .42s cubic-bezier(.25,1.7,.45,1)}.mini-play{width:44px;height:44px;flex:none;border-radius:50%;border:0;cursor:pointer;background:var(--ground);display:inline-grid;place-items:center;vertical-align:middle}.mini-play:before{content:"";margin-left:3px;border-style:solid;border-width:8px 0 8px 13px;border-color:transparent transparent transparent var(--paper)}.mini-play.saying:before{width:12px;height:12px;margin:0;border:0;border-radius:2px;background:var(--paper)}.choices{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.choices.five{grid-template-columns:repeat(2,minmax(0,1fr))}.choice{position:relative;width:100%;min-height:72px;padding:10px 10px 12px;display:grid;place-items:center;gap:2px;text-align:center;border:2px solid 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-1}.deck-count{font-size:13px;font-weight:700;color:#111325b3}.flash{perspective:1200px}.flash-card{position:relative;display:block;width:100%;min-height:280px;padding:0;border:0;background:none;cursor:pointer;font:inherit;color:var(--ink);transform-style:preserve-3d;transition:transform .46s cubic-bezier(.3,1.25,.5,1);-webkit-tap-highlight-color:transparent}.flash-card.flipped{transform:rotateY(180deg)}.face{position:absolute;inset:0;display:grid;place-items:center;align-content:center;gap:8px;padding:22px 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ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:6px}.print-sheet li{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:8px;align-items:center;padding:8px 10px;border:1.5px solid rgba(17,19,37,.16);border-radius:12px}.ps-sign{grid-row:span 2;font-family:PingFang TC,Noto Sans TC,Heiti TC,sans-serif;font-size:34px;line-height:1}.ps-pinyin{font-weight:800;font-size:16px}.ps-word{font-size:13px;color:#111325cc}.ps-title{font-family:var(--display);font-weight:800;font-variation-settings:"wdth" 75,"opsz" 48;font-size:34px;margin:0}.ps-foot{margin:14px 0 0;font-size:13px;color:#111325b3}.print-actions{display:flex;flex-wrap:wrap;gap:10px;max-width:900px;margin:0 auto 16px}.print-actions .action{height:56px;padding:0 26px;font-size:22px}@media print{@page{size:A4;margin:10mm}body{background:#fff!important;color:#000}.bar,.skip,.foot,.cta,.tool-head,.print-actions,.article,.consent{display:none!important}.tool-stage{padding:0!important;background:none!important}.print-sheet{box-shadow:none;border-radius:0;padding:0;max-width:none}.print-sheet ul{grid-template-columns:repeat(5,1fr)}.print-sheet li{break-inside:avoid}}@media(min-width:860px){.tool-head{max-width:1080px;margin:0 auto;padding-top:34px}.panel{padding:22px 22px 24px}.groups{grid-template-columns:repeat(4,minmax(0,1fr))}.panel.wide{max-width:760px}.share-row-tools{grid-template-columns:1fr 1fr}}@media(prefers-reduced-motion:reduce){.flash-card{transition:none}.choice,.big-play{transition:none;animation:none!important}}