:root{color-scheme:light;--ink:#3f392d;--teal:#176a5b;--gold:#c99348;--paper:#fffaf0;--line:#e5d9c5;font-family:'Microsoft YaHei','PingFang SC',Arial,sans-serif}*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden;background:#402c1e;color:var(--ink)}button,label{ -webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:focus-visible,label:focus-visible{outline:3px solid #d5a24f;outline-offset:5px}button:disabled{cursor:default;opacity:.45}button,button img{user-select:none}button{border:0}button:active{transform:scale(.96)}[hidden]{display:none!important}#museum{position:relative;isolation:isolate;width:100%;height:100%;overflow:hidden;touch-action:none;outline:none}#scene{position:absolute;inset:0;background-image:url('assets/panorama.png');background-repeat:repeat-x;will-change:background-position,background-size;cursor:grab}#scene.dragging{cursor:grabbing}.shade{position:absolute;inset:0;pointer-events:none;background:linear-gradient(#23170f66,transparent 20%,transparent 75%,#23170f77)}.museum-title{position:absolute;left:34px;top:27px;color:#fff5df;font-size:22px;font-weight:600;letter-spacing:5px;text-shadow:0 2px 9px #342212}.museum-title span{display:block;margin-top:8px;font:10px Arial;letter-spacing:3px;opacity:.75}.top-tools{position:absolute;right:28px;top:26px;display:flex;gap:8px}.glass,.pan-controls{background:#38281c80;backdrop-filter:blur(12px);border:1px solid #ffefc637;color:#fff7e3;box-shadow:0 3px 20px #1f100b26}.glass{width:42px;height:42px;border-radius:50%;font-size:23px}.glass[aria-pressed=true]{background:#176a5bbb}.hotspot{position:absolute;top:50%;left:40%;width:108px;height:137px;padding:0;background:transparent;transform:translate(-50%,-50%);filter:drop-shadow(0 6px 9px #24110688);z-index:2}.hotspot:active{transform:translate(-50%,-50%) scale(.94)}.hotspot img{width:108px;height:108px;object-fit:contain;animation:bob 4s ease-in-out infinite}.hotspot:hover img{filter:brightness(1.14)}.hotspot span{display:table;margin:-5px auto 0;padding:7px 14px;border:1px solid #e1c49690;border-radius:20px;color:#fff8e8;background:#432d1ee6;letter-spacing:2px;font-size:13px;white-space:nowrap;box-shadow:0 3px 9px #28191044}.hotspot .done{position:absolute;right:5px;top:8px;width:26px;height:26px;line-height:26px;border-radius:50%;background:var(--teal);color:white;font-style:normal}#reading img{animation-delay:-1.8s}.pan-controls{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);display:flex;gap:1px;padding:4px 10px;border-radius:32px}.pan-controls button{width:46px;height:42px;background:transparent;color:#fff5df;font-size:25px;border-radius:50%}.pan-controls button:hover,.glass:hover{background:#ffffff24}#hint{position:absolute;bottom:94px;left:50%;transform:translateX(-50%);color:#fff9ed;font-size:13px;letter-spacing:2px;text-shadow:0 1px 6px #24160b;transition:opacity 1s;pointer-events:none}.return-class{position:absolute;right:28px;bottom:28px;width:auto;padding:0 16px;height:42px;border-radius:22px;font-size:13px}dialog{position:fixed;inset:0;margin:auto;width:min(1080px,94vw);max-height:92dvh;padding:0;border:1px solid #f9e9c9;border-radius:24px;background:var(--paper);color:var(--ink);box-shadow:0 25px 120px #120a08aa;overflow:auto}dialog::backdrop{background:#20180e88;backdrop-filter:blur(9px)}dialog[open]{animation:enter .25s ease-out}.dialog-head{display:flex;align-items:center;justify-content:space-between;padding:24px 32px 18px}.eyebrow{font-size:10px;letter-spacing:3px;color:#97805c;margin:0 0 7px}h1{font-size:25px;letter-spacing:1px;margin:0;font-weight:600}.close{font-size:28px;width:40px;height:40px;line-height:35px;border-radius:50%;background:#eee5d6;color:#695538}.close:hover{background:#e4d7c3}.exercise-nav{display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line)}.tabs{display:flex;gap:28px}.tabs button{padding:14px 0;background:transparent;color:#8b816f;border-bottom:3px solid transparent;font-size:15px}.tabs button[aria-selected=true]{border-color:var(--teal);color:var(--teal);font-weight:600}.tabs span{font:12px Arial;margin-left:8px;opacity:.65}.text-button{font:13px 'Microsoft YaHei',sans-serif;border:0;background:transparent;color:#7d6d53;cursor:pointer;padding:10px}.instruction{font-size:13px;color:#8e8069;margin:16px 0}.match-board{position:relative;width:min(860px,100%);margin:auto;overflow:hidden;border-radius:12px;touch-action:none}.match-board>img{display:block;width:100%;height:auto}.match-board svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.match-target{position:absolute;background:transparent;border:3px solid transparent;border-radius:12px;transition:border-color .15s,box-shadow .15s}.match-target.selected{border-color:#cd953b;box-shadow:0 0 0 4px #e4b45b60}.match-target.correct{border-color:var(--teal);box-shadow:0 0 0 3px #176a5b20}.match-target.wrong{border-color:#cd5c3f;animation:shake .25s}.match-target:hover{box-shadow:0 0 0 3px #d8b26c60}#matchPanel,#dotsPanel{padding:0 32px}.exercise-footer{display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:72px;padding:16px 32px;color:#87775e;font-size:14px}.primary{display:inline-block;background:var(--teal);color:#fffaf0;border-radius:24px;padding:12px 24px;font-size:14px;cursor:pointer;white-space:nowrap}.primary:hover{background:#125548}.dots-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px}.mini-tabs{display:flex;gap:8px}.mini-tabs button,.round{border-radius:50%;width:38px;height:38px;background:#ebe2d2;color:#74624a}.mini-tabs button[aria-pressed=true]{background:var(--teal);color:#fff}.mini-tabs button.solved{box-shadow:inset 0 0 0 2px #aa9147}.dot-stage{height:min(49vh,455px);min-height:240px;display:flex;justify-content:center;align-items:center;background:#fff;border-radius:14px;overflow:hidden}#dotBoard{width:100%;height:100%;touch-action:none}.dot-hit{cursor:pointer;outline:none}.dot-hit .dot{fill:#c78935;stroke:#fff;stroke-width:2}.dot-hit.visited .dot{fill:#176a5b}.dot-hit text{font-family:Arial,sans-serif;fill:#534a3a;font-weight:600;paint-order:stroke;stroke:#fff;stroke-width:3px;stroke-linejoin:round}.dot-hit:focus .dot,.dot-hit:hover .dot{stroke:#d9a33f;stroke-width:4}.dot-hit.wrong{animation:shake .3s}.dot-line{stroke:#1c8b76;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;fill:none}.success-glow{animation:success .65s ease-out}#bookEmpty{min-height:390px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:25px}#bookEmpty>img{width:155px;height:155px;object-fit:contain}#bookEmpty h2{font-size:19px;margin:9px 0}#bookEmpty p{font-size:14px;color:#8a7b65;line-height:1.8;margin:4px 0 24px}#bookStage{height:65vh;min-height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0 24px 10px;background:#2d291f}#bookVideo{max-width:100%;width:100%;height:100%;object-fit:contain}#bookPage{max-width:100%;max-height:calc(100% - 54px);object-fit:contain}#pageControls{display:flex;align-items:center;gap:28px;margin-top:10px;color:#f7ead4;font-size:13px}.reader-footer{display:flex;justify-content:space-between;align-items:center;padding:12px 30px;font-size:12px;color:#98866d}#toast{position:fixed;bottom:100px;left:50%;transform:translateX(-50%);padding:12px 20px;max-width:90vw;border-radius:16px;background:#342819e8;color:#fff7e7;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:99}#toast.visible{opacity:1}#transition{position:fixed;inset:0;pointer-events:none;background:#f6dfb5;opacity:0;z-index:90}.transitioning{animation:flash .35s ease-out}body.reduced *,body.reduced *::before{animation:none!important;scroll-behavior:auto!important;transition:none!important}@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes enter{from{opacity:0;transform:translateY(15px) scale(.98)}to{opacity:1;transform:none}}@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}@keyframes success{50%{filter:drop-shadow(0 0 10px #d7b65f)}}@keyframes flash{0%{opacity:.23}100%{opacity:0}}@media(max-width:650px){.museum-title{left:20px;top:22px;font-size:17px;letter-spacing:3px}.museum-title span{font-size:8px}.top-tools{right:14px;top:18px;gap:5px}.glass{width:35px;height:35px;font-size:20px}.hotspot{width:90px;height:112px}.hotspot img{width:90px;height:90px}.hotspot span{font-size:11px;padding:5px 10px}.pan-controls{bottom:22px;padding:2px 5px}.pan-controls button{width:38px;height:38px}.return-class{right:12px;bottom:78px;font-size:11px;width:auto}.dialog-head{padding:20px 18px 12px}h1{font-size:21px}.exercise-nav{padding:0 18px}.tabs{gap:16px}.tabs button{font-size:13px}.tabs span{margin-left:3px}#matchPanel,#dotsPanel{padding:0 12px}.instruction{font-size:11px}.exercise-footer{padding:14px 18px;font-size:12px}.dots-toolbar{flex-wrap:wrap}.mini-tabs{margin:0 0 8px auto}.dot-stage{height:49vh}.match-target{border-width:2px;border-radius:5px}#bookEmpty{min-height:330px}.reader-footer{padding:10px 16px}#hint{font-size:11px;bottom:80px;white-space:nowrap}}
:root .match-board{width:min(860px,100%,calc((92dvh - 270px)*1.844))}
:root #cylinder{position:absolute;inset:0;overflow:hidden;pointer-events:none;display:none;perspective-origin:50% 50%;background:#47301e}:root #scene.immersive #cylinder{display:block}#cylinderWorld{position:absolute;left:50%;top:50%;width:0;height:0;transform-style:preserve-3d}.pano-strip{position:absolute;left:0;top:0;backface-visibility:hidden;background-image:url('assets/panorama.png');background-repeat:repeat-x;transform-style:preserve-3d}

/* English classroom labels and completed-picture reveal. */
:root{font-family:Arial,Helvetica,sans-serif}.museum-title{font-size:16px;letter-spacing:3px}.text-button{font-family:inherit}.hotspot span{letter-spacing:1px}#hint{letter-spacing:.5px;white-space:nowrap}.result-controls{display:flex;justify-content:center;gap:20px;min-height:30px}#dotResult{width:100%;height:100%;padding:14px;display:flex;align-items:center;justify-content:center;gap:18px}#dotResult figure{height:100%;max-width:440px;flex:1;margin:0;display:flex;flex-direction:column;align-items:center;justify-content:center}#dotResult svg{display:block;width:100%;min-height:0;flex:1}#dotResult figcaption{padding-top:10px;color:var(--teal);font-size:18px;font-weight:600}#dotResult.gallery{gap:26px}#dotResult.gallery figure{height:85%}@media(max-width:650px){.museum-title{max-width:140px;font-size:12px}.tabs{gap:12px}.tabs button{font-size:12px}.tabs span{font-size:10px}h1{font-size:22px}.exercise-nav{padding:0 12px}.return-class{font-size:11px}#dotResult.gallery{gap:6px;padding:6px}#dotResult.gallery figcaption{font-size:13px}}