.body-study{max-width:1240px;margin:auto}
.body-study .an-intro h2{font-size:clamp(28px,3vw,40px)}
.body-study .bs-positions span{font-size:13px}
.bs-stage-heading{display:flex;align-items:center;gap:16px;padding:22px 0}.bs-stage-heading>div{flex:1}.bs-stage-heading h3{margin:0 0 5px;font-size:22px}.bs-stage-heading p{margin:0;font-size:14px;line-height:1.5;color:#56685e}
.bs-workspace{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,1fr);gap:28px;align-items:start}.bs-image-area{min-width:0}
.bs-figure{position:relative;margin:0 auto;background:#e6e9e4;border-radius:14px;overflow:hidden;max-width:520px;box-shadow:0 8px 26px #27483b12}
.bs-figure figcaption{position:absolute;z-index:2;top:0;left:0;right:0;display:flex;justify-content:space-between;gap:12px;padding:15px 18px;background:#183d32ed;color:white;pointer-events:none;font-size:14px;line-height:1.4}.bs-figure figcaption span{color:#d7e8dc}
.bs-photo{display:block;width:100%;height:auto;max-height:650px;touch-action:pan-y}
.bs-figure figcaption{position:relative}.bs-figure .bs-photo-footer{position:relative;background:#183d32;padding:10px 18px}
.bs-zone{cursor:pointer;outline:none}.bs-zone path{fill:#d2e9df;fill-opacity:0;stroke:#fff;stroke-opacity:0;stroke-width:1.1;stroke-linejoin:round;vector-effect:non-scaling-stroke;transition:fill-opacity .15s,stroke .15s;pointer-events:all}
.bs-zone.is-highlighted path,.bs-zone:focus-visible path{fill:#e5b866;fill-opacity:.3;stroke:#fff8dc;stroke-opacity:1;stroke-width:3}.bs-zone[aria-pressed=true] path{fill:#65dab3;fill-opacity:.3;stroke:#fff;stroke-opacity:1;stroke-width:3}
.bs-photo-footer{position:absolute;bottom:0;left:0;right:0;padding:16px 18px;background:linear-gradient(transparent,#13352ce6);display:flex;align-items:center;gap:12px;color:white;font-size:26px;font-weight:700;pointer-events:none}.bs-photo-footer span{font-size:14px;font-weight:400}
.bs-zone-label{font-size:14px;font-weight:700;margin:20px 0 10px}.bs-picker{display:grid;grid-template-columns:1fr 1fr;gap:7px}.bs-picker button{display:flex;gap:10px;align-items:center;min-height:46px;text-align:left;font:inherit;font-size:14px;padding:10px 12px;border:1px solid #ced9ce;background:#fffefb;border-radius:8px;color:#27483b;cursor:pointer}.bs-picker button span{font-size:12px;color:#8a7049}.bs-picker button[aria-pressed=true]{background:#284b3e;color:white;border-color:#284b3e}.bs-picker button[aria-pressed=true] span{color:#e5c68d}
.bs-frame-note{color:#657263;font-size:13px;line-height:1.5;margin:10px 0 0}
.bs-card{position:sticky;top:20px;padding:26px;border:1px solid #d6dfd7;border-radius:14px;background:#fffefb;min-height:310px;max-height:calc(100svh - 40px);overflow:auto;scrollbar-width:thin;scrollbar-color:#becbc1 transparent}
.bs-card h3{font:400 30px/1.15 Georgia,serif;margin:9px 0 0}.bs-card p{font-size:16px;line-height:1.65;color:#53665a}.bs-card .eyebrow{font-size:12px;color:#85612f;line-height:1.6;letter-spacing:.06em}
.bs-card-head{display:flex;align-items:flex-start;gap:10px}.bs-card-head>div{flex:1}.bs-card-head .an-icon{width:38px;height:38px}.bs-card .bs-phase{display:flex;gap:12px;align-items:center;padding:13px 0;border-bottom:1px solid #d6dfd7;font-weight:700;font-size:18px;color:#27483b;margin:14px 0}.bs-phase span{font-size:14px;font-weight:400}.bs-card .bs-purpose{font-size:17px;color:#27483b;margin:16px 0}
.bs-sides{display:flex;background:#eef2ec;padding:4px;gap:4px;border-radius:9px;margin:20px 0}.bs-sides button{flex:1;min-height:54px;font:inherit;font-size:14px;background:transparent;color:#56685e;border:0;border-radius:6px;cursor:pointer}.bs-sides small{display:block;font-size:12px;margin-top:3px}.bs-sides [aria-pressed=true]{background:white;color:#27483b;box-shadow:0 2px 5px #27483b12;font-weight:700}
.bs-muscles section{padding:16px 0;border-bottom:1px solid #e0e6dc}.bs-muscles h4{font-size:18px;margin:0 0 8px;color:#284b3e}.bs-muscles p{margin:0 0 12px}.bs-muscles details p{font-size:14px;margin:12px 0}.bs-muscles summary,.bs-sources summary{font-size:14px;cursor:pointer;line-height:1.6;color:#53705b}
.bs-card .bs-small{font-size:13px;line-height:1.6;color:#647566}.bs-count{border-top:1px solid #d6dfd7;padding-top:18px}.bs-empty{padding-top:12px}.bs-empty h3{margin:14px 0 24px}.bs-sources{margin-top:22px}.bs-sources p,.bs-sources li{font-size:14px;line-height:1.65}.bs-sources ul{padding-left:20px}.bs-sources li{margin:12px 0}.bs-sources a,.bs-credits a{color:#326149;text-underline-offset:3px}
.bs-credits{padding-top:20px;border-top:1px solid #d6dfd7;margin-top:26px}.bs-credits summary{font-size:14px;cursor:pointer;font-weight:700}.bs-credits p{font-size:14px;line-height:1.7;color:#56685e}.bs-collapse{display:none}
.body-study button:focus-visible,.body-study summary:focus-visible{outline:3px solid #b47d37;outline-offset:3px}
@media(max-width:760px){.body-study .an-intro{margin-top:22px}.body-study .an-intro h2{font-size:29px}.body-study .an-handed{font-size:14px}.body-study .an-handed small{font-size:12px}.body-study .bs-positions button{min-height:44px;padding:12px 3px}.body-study .bs-positions span{display:none}.bs-stage-heading{gap:10px;padding:18px 0}.bs-stage-heading h3{font-size:20px}.bs-stage-heading p{font-size:13px}.bs-workspace{display:block}.bs-figure figcaption{padding:11px 12px;font-size:12px}.bs-figure figcaption strong{font-size:13px}.bs-photo{max-height:590px}.bs-card{position:static;max-height:none;min-height:0;margin-top:20px;padding:20px}.bs-card.is-selected{position:fixed;left:0;right:0;bottom:0;top:auto;border-radius:20px 20px 0 0;z-index:45;max-height:42svh;padding:18px 20px calc(18px + env(safe-area-inset-bottom));margin:0;box-shadow:0 -8px 34px #142f2a30;overscroll-behavior:contain}.bs-card.is-selected.is-collapsed .bs-card-body{display:none}.bs-card h3{font-size:26px}.bs-collapse{display:grid}.bs-card-head .an-icon{width:42px;height:42px}.bs-picker button{font-size:14px;padding:10px;gap:8px}.bs-credits{margin-bottom:20px}.body-study:has(.bs-card.is-selected){padding-bottom:90px}}
@media(prefers-reduced-motion:reduce){.bs-zone path{transition:none}}

.bs-zone path{stroke-linecap:round}
/* lab306: finer rounded regions; a single active contour keeps the photo legible. */
.bs-zone path{pointer-events:fill;stroke-width:1.6;stroke-linejoin:round;stroke-linecap:round}
.bs-zone.is-highlighted path,.bs-zone:focus-visible path{fill:#e5b866;fill-opacity:.16;stroke:#ffe3a7;stroke-opacity:1;stroke-width:1.8;filter:drop-shadow(0 1px 1px #102d2480)}
.bs-zone[aria-pressed=true] path{fill:#65dab3;fill-opacity:.17;stroke:#c2ffe6;stroke-opacity:1;stroke-width:1.8}
.bs-photo:has(.is-highlighted) .bs-zone[aria-pressed=true]:not(.is-highlighted) path{fill-opacity:0;stroke-opacity:0;filter:none}
.bs-phase-note{margin:18px 0 24px;padding:18px;background:#edf3ee;border-radius:10px}.bs-phase-note h4{margin:0 0 8px;font-size:15px;color:#2c5742}.bs-phase-note p{margin:0;color:#27483b;font-size:17px}
.bs-muscle-detail{border-top:1px solid #d6dfd7;border-bottom:1px solid #d6dfd7}.bs-muscle-detail>summary{cursor:pointer;padding:18px 0;font-size:16px;font-weight:600;line-height:1.6}.bs-muscle-detail>summary span{font-weight:400;color:#687566;margin-left:8px}.bs-muscle-detail .bs-muscles section:last-child{border-bottom:0}