:root{--ink:#151610;--paper:#f4f1e8;--cream:#e8e3d7;--acid:#d7ff43;--orange:#ff6b3d;--muted:#77786f;--line:rgba(21,22,16,.14);--sans:'Noto Sans TC','Microsoft JhengHei',system-ui,sans-serif;--display:'Arial Narrow','Roboto Condensed',Impact,sans-serif}
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@media(max-width:520px){.hero-kicker{font-size:10px}.hero h1{font-size:72px}.hero>p{font-size:13px}.section-heading h2{font-size:33px}.section-heading small{display:none}.category-section{padding-top:52px}.exercise-card{grid-template-columns:36px 1fr 34px;gap:10px;padding:19px 2px}.exercise-tags{display:none}.exercise-info h3{font-size:15px}.exercise-open{width:32px;height:32px}.offline-note{padding:26px 22px;align-items:flex-start}.offline-note .offline-icon{width:44px;height:44px}.offline-note h2{font-size:25px}.detail-content>h2{font-size:36px}.mistakes ul{grid-template-columns:1fr}.motion-stage{height:340px}.motion-figure svg{width:105%}.safety-note{flex-direction:column;gap:6px}}
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button,a,input{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--orange);outline-offset:3px}

/* Clear offline start/end coaching frames */
.motion-stage{height:auto;min-height:470px;padding:76px 24px 24px;background:#191a15}.motion-stage:before{opacity:.45}.motion-frames{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1fr) 52px minmax(0,1fr);align-items:center;gap:10px}.motion-frame{margin:0;aspect-ratio:3/2;background:#2a2b24;border:1px solid #46473e;position:relative;overflow:hidden}.motion-frame img{width:100%;height:100%;display:block;object-fit:cover}.frame-badge{position:absolute;z-index:2;left:10px;top:10px;background:rgba(21,22,16,.9);color:white;padding:7px 9px;display:flex;align-items:center;gap:7px;backdrop-filter:blur(6px)}.frame-badge b{font:800 18px var(--display);color:var(--acid)}.frame-badge span{font-size:10px;font-weight:700;letter-spacing:.05em}.motion-arrow{text-align:center;color:var(--acid);display:grid;place-items:center}.motion-arrow span{font:800 32px var(--display);line-height:1}.motion-arrow small{font-size:9px;color:#a8a99f;letter-spacing:.12em;margin-top:3px}.visual-cue{position:relative;z-index:2;margin-top:18px;border-left:3px solid var(--acid);padding:10px 14px;background:#24251f;display:flex;gap:13px;align-items:baseline}.visual-cue span{font:700 9px var(--display);letter-spacing:.14em;color:var(--acid);white-space:nowrap}.visual-cue strong{font-size:13px;line-height:1.55;color:#f0f0e8}.detail-content:after{content:'真人示範圖：free-exercise-db · Public Domain';display:block;margin-top:24px;font-size:9px;color:#999a91;letter-spacing:.04em}
@media(max-width:520px){.motion-stage{min-height:0;padding:68px 14px 18px}.motion-frames{grid-template-columns:1fr;gap:8px}.motion-frame{aspect-ratio:3/2}.motion-arrow{height:28px;display:flex;justify-content:center;gap:7px}.motion-arrow span{transform:rotate(90deg);font-size:26px}.motion-arrow small{margin:0}.frame-badge{left:8px;top:8px}.visual-cue{margin-top:12px;align-items:flex-start}}