*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden}body{background:#171b16;color:#dcd7b7;font-family:"Yu Mincho","Hiragino Mincho ProN",serif}button{font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}button:focus-visible{outline:2px solid #d9c38d;outline-offset:6px}[hidden]{display:none!important}.gallery{height:100%;height:100dvh;display:flex;align-items:center;justify-content:center;padding:8vw;background:radial-gradient(ellipse at 50% 43%,#414638 0,#242c23 48%,#101711 100%)}.painting{display:block;width:min(900px,85vw,125vh);padding:0;border:17px ridge #796344;background:#877b58;box-shadow:0 30px 70px #000b,0 0 0 2px #171b12;transition:transform .6s,filter .6s}.painting:hover{transform:scale(1.015);filter:brightness(1.08)}.painting svg{display:block;width:100%;height:auto}.inside{position:fixed;inset:0;background:#414c37;isolation:isolate;animation:arrive 1.1s ease-out}.viewport{position:absolute;inset:0;perspective:760px;perspective-origin:50% 48%;overflow:hidden;touch-action:none}.room{--depth:390px;position:absolute;inset:-2%;transform-style:preserve-3d;transform:translateZ(22px) rotateX(var(--pitch,0deg)) rotateY(var(--yaw,0deg));transition:transform .5s cubic-bezier(.2,.6,.2,1);will-change:transform}.surface{position:absolute;backface-visibility:hidden;background-color:#8d9171;background-image:url('texture.svg');background-size:380px 380px;box-shadow:inset 0 0 75px #17241370}.surface:after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#27371c55,transparent 20%,transparent 80%,#27371c55)}.back-wall{inset:0;transform:translateZ(calc(-1 * var(--depth)));background-color:#a2a183;background-image:radial-gradient(ellipse at 48% 40%,#d2cba955,transparent 68%),url('texture.svg');box-shadow:inset 0 0 120px #28391b88,inset 0 0 5px #25391c;display:flex;align-items:center;justify-content:center}.left-wall{top:0;bottom:0;left:0;width:var(--depth);transform-origin:left center;transform:rotateY(90deg);background-color:#667351;background-image:linear-gradient(90deg,#1c3218aa,#9a9c7355),url('texture.svg')}.right-wall{top:0;bottom:0;right:0;width:var(--depth);transform-origin:right center;transform:rotateY(-90deg);background-color:#949776;background-image:linear-gradient(90deg,#b8ad7c55,#2d3d23aa),url('texture.svg')}.ceiling{left:0;right:0;top:0;height:var(--depth);transform-origin:center top;transform:rotateX(-90deg);background-color:#626f4e;background-image:linear-gradient(#24391dbb,#9b9d7155),url('texture.svg')}.floor{left:0;right:0;bottom:0;height:var(--depth);transform-origin:center bottom;transform:rotateX(90deg);background-color:#918567;background-image:linear-gradient(#aaa17c55,#343e27cc),url('texture.svg');box-shadow:inset 0 0 100px #1b291977}.wall-light{position:absolute;inset:0;background:radial-gradient(ellipse at 48% 20%,#e5d7a438,transparent 62%);pointer-events:none}.letters{position:relative;display:grid;grid-template-columns:repeat(10,minmax(0,1fr));width:88%;gap:1%;transform:translateY(-5%);z-index:1}.tile{position:relative;display:flex;align-items:center;justify-content:center;min-width:0;aspect-ratio:.8;padding:0;background:transparent;border:0;color:#35462b;font-size:clamp(30px,5.4vw,88px);font-family:inherit;text-shadow:0 1px 0 #dfd6a488,1px 2px 2px #25371a33;touch-action:manipulation;transition:transform .25s,color .25s,filter .25s}.tile:hover{color:#202f19;transform:translateY(-3px)}.tile.selected{color:#efdf9c;transform:translateY(-9px) translateZ(12px);text-shadow:0 3px 6px #213019aa,0 0 20px #e6d4a366}.tile.fixed{cursor:default;color:#465535;text-shadow:0 1px #e2d8aa,0 -1px #3c4c2a;transform:none}.tile:focus-visible{outline:1px solid #e0cc9488;outline-offset:0}.canvas-skin{position:absolute;inset:0;pointer-events:none;opacity:.11;background-image:repeating-linear-gradient(2deg,transparent 0 2px,#bdb186 3px,transparent 4px),repeating-linear-gradient(91deg,transparent 0 3px,#221f13 4px,transparent 5px);mix-blend-mode:soft-light}.vignette{position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 50% 47%,transparent 25%,#10201488 100%);box-shadow:inset 0 0 45px #0a160f66}.exit,.reset{position:fixed;z-index:5;bottom:max(20px,env(safe-area-inset-bottom));right:max(22px,env(safe-area-inset-right));width:46px;height:46px;background:transparent;border:0;padding:10px;color:#ded7b3;opacity:.45;transition:opacity .3s}.exit:hover,.reset:hover{opacity:1}.exit svg,.reset svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round}.entered .reset{display:none}.entered .gallery{visibility:hidden}.success{position:absolute;left:0;right:0;bottom:15%;text-align:center;font:12px Georgia,serif;letter-spacing:.6em;color:#ede0b5;text-shadow:0 0 20px #edda98;animation:reveal 2s ease}.solved .back-wall{background-color:#b0ad87;transition:background-color 2s}.solved .tile{color:#e7dab0;text-shadow:0 0 12px #e8d39366}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.portal-flight{position:fixed;z-index:40;pointer-events:none;overflow:hidden;border:17px ridge #796344;background:#697359;box-shadow:0 0 0 150vmax #171e1a}.portal-flight svg{width:100%;height:100%}@keyframes arrive{from{filter:blur(4px);opacity:.5}to{filter:blur(0);opacity:1}}@keyframes reveal{from{opacity:0}to{opacity:1}}@media(max-width:600px){.gallery{padding:7vw}.painting{border-width:11px;width:86vw}.room{--depth:230px}.viewport{perspective:650px}.letters{width:96%;gap:0}.tile{font-size:8.1vw;min-height:60px;aspect-ratio:.65}.exit,.reset{bottom:max(14px,env(safe-area-inset-bottom));right:12px}.portal-flight{border-width:11px}.success{font-size:10px;bottom:20%}}@media(max-height:500px) and (min-width:601px){.room{--depth:250px}.tile{font-size:7vh;max-height:80px}.success{bottom:12%}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}.room{transform:translateZ(22px)}.portal-flight{display:none}}


/* Start screen and exhibition layout */
html,body{height:auto;min-height:100%;overflow-x:hidden;overflow-y:auto}body{min-height:100dvh}a{color:inherit;text-decoration:none}a:focus-visible{outline:2px solid #e0cc94;outline-offset:5px}.start-page{background:radial-gradient(ellipse at 50% 40%,#394334,#172019 65%,#111810)}.start-screen{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:45px 22px 65px;text-align:center}.start-screen h1{font-size:clamp(25px,4.8vw,45px);font-weight:400;letter-spacing:.14em;line-height:1.8;margin:35px 0 43px}.mini-frame{width:100px;height:76px;border:7px ridge #8e7851;padding:10px;background:#737d5b;box-shadow:0 10px 35px #0007;transform:rotate(-2deg)}.mini-frame div{height:100%;background:#adb08a;box-shadow:inset 11px 4px #59694c,inset -11px -7px #8b8865}.start-actions{display:flex;flex-direction:column;gap:13px;width:min(280px,85vw)}.action{display:inline-flex;align-items:center;justify-content:center;min-height:49px;border:1px solid #b3a67c88;padding:13px 25px;font-size:13px;letter-spacing:.1em;transition:background .25s,transform .25s}.action:hover{background:#b5ab7b22;transform:translateY(-1px)}.action.primary{background:#d2c89e;color:#283422;border-color:#d2c89e}.action.primary:hover{background:#e1d6af}.action.secondary{color:#bfc3ad;border-color:#9ca78944}.game-page{background:radial-gradient(ellipse at 50% 43%,#414638,#242c23 50%,#101711)}.gallery{height:auto;min-height:100dvh;flex-direction:column;justify-content:center;gap:0;padding:32px 24px 75px;background:none}.game-title{font-size:clamp(23px,3.4vw,34px);font-weight:400;letter-spacing:.13em;text-align:center;line-height:1.8;margin:0 0 30px}.painting{width:min(850px,86vw,108vh);flex-shrink:0}.title-plaque{min-width:280px;max-width:90vw;min-height:69px;background:#f6f3e9;color:#30362b;border:1px solid #e4dfcf;padding:23px 32px;margin-top:26px;box-shadow:0 5px 14px #0003;text-align:center;font-size:clamp(16px,2.3vw,22px);letter-spacing:.13em}.title-plaque span{display:block}.title-plaque.reveal span{animation:title-reveal 1.7s ease both}.clear-panel{text-align:center;margin-top:26px;animation:clear-reveal 1.5s ease both}.clear-mark{font:14px Georgia,serif;letter-spacing:.35em;color:#e9d49a;margin:0 0 22px}.clear-mark:focus{outline:0}.actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.solved .painting{box-shadow:0 20px 65px #d4ba6b33,0 0 0 2px #bba56b55;transition:box-shadow 1.7s}.solved .painting{cursor:default}.inside{z-index:20}.entered{overflow:hidden;height:100dvh}.entered .reset{display:none}.entered .gallery{visibility:hidden}.canvas-skin{opacity:.025}.exit{z-index:25}.reset{z-index:10}@keyframes title-reveal{0%{opacity:0;filter:blur(8px);transform:translateY(5px)}100%{opacity:1;filter:blur(0);transform:translateY(0)}}@keyframes clear-reveal{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:600px){.gallery{padding:30px 17px 75px}.game-title{font-size:23px;margin-bottom:28px}.title-plaque{min-width:245px;padding:20px 18px;font-size:17px;margin-top:23px}.actions{gap:10px}.actions .action{font-size:12px;padding:12px 17px}.clear-panel{margin-top:24px}}@media(prefers-reduced-motion:reduce){.title-plaque.reveal span,.clear-panel{animation:none}}

/* Decorative 3D planes must never cover the clickable back-wall letters. */
.room,.surface,.letters{pointer-events:none}
.tile{pointer-events:auto;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.tile.selected{transform:none;color:#f4e6b5;background:#d5c48b18;outline:1px solid #e4d29a99;outline-offset:-2px}
.tile:hover{transform:none}

/* Clear, consistently visible exit control. */
.exit{display:flex;align-items:center;justify-content:center;gap:10px;width:auto;min-width:174px;min-height:52px;height:auto;padding:14px 20px;right:max(24px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));opacity:1;color:#fff8df;background:#203025f2;border:1px solid #ded0a2;border-radius:5px;box-shadow:0 5px 22px #08140db3,0 0 0 3px #16241b55;font-size:14px;letter-spacing:.06em;touch-action:manipulation}
.exit svg{flex:0 0 24px;width:24px;height:24px;stroke-width:1.8}
.exit:hover{background:#354a35;opacity:1}.exit:active{background:#17261b}.exit span{white-space:nowrap}
@media(max-width:600px){.exit{right:max(16px,env(safe-area-inset-right));bottom:max(18px,env(safe-area-inset-bottom));padding:13px 17px;min-width:166px;font-size:13px}}

/* Continuous box: each side extends well past every visible viewing ray. */
.viewport{perspective:900px;perspective-origin:50% 50%;background:#596548}
.room{--depth:220px;--front:650px;inset:23% 12%;transform:rotateX(var(--pitch,0deg)) rotateY(var(--yaw,0deg));transform-origin:50% 50% 0;transition:transform .55s cubic-bezier(.2,.65,.2,1)}
.left-wall,.right-wall{width:calc(var(--depth) + var(--front))}
.left-wall{transform:translateZ(var(--front)) rotateY(90deg)}
.right-wall{transform:translateZ(var(--front)) rotateY(-90deg)}
.ceiling,.floor{height:calc(var(--depth) + var(--front))}
.ceiling{transform:translateZ(var(--front)) rotateX(-90deg)}
.floor{transform:translateZ(var(--front)) rotateX(90deg)}
.surface{backface-visibility:visible}
.back-wall{box-shadow:inset 0 0 65px #29391b88,inset 0 0 4px #25391c}
.ceiling{background-color:#515e40;box-shadow:inset 0 0 100px #182b1b88}
.left-wall{background-color:#566344}.right-wall{background-color:#808768}
.letters{width:94%;gap:.5%}
.tile{font-size:clamp(25px,4.8vw,72px)}
.vignette{background:radial-gradient(ellipse at 50% 48%,transparent 21%,#10201499 100%);box-shadow:inset 0 0 50px #0a160f77}
@media(max-width:600px){.viewport{perspective:900px}.room{--depth:180px;--front:650px;inset:25% 7%}.letters{width:98%;gap:0}.tile{font-size:8.1vw;min-height:50px}}
@media(max-height:500px) and (min-width:601px){.room{--depth:190px;inset:22% 12%}.tile{font-size:7vh;max-height:70px}}
@media(prefers-reduced-motion:reduce){.room{transform:none}}

/* Larger canvas, with the small illuminated box surrounded by darkness. */
.gallery{padding:30px 18px 70px}.painting{width:min(1180px,94vw);border-width:15px;box-shadow:0 24px 80px #000c,0 0 0 2px #171b12}.painting:hover{transform:scale(1.006)}
.game-title{margin-bottom:25px}.title-plaque{margin-top:23px}



@media(max-width:600px){.gallery{padding:28px 10px 72px}.painting{width:96vw;border-width:10px}.game-title{font-size:22px}}

/* Square back face and close side walls: a compact cube around the viewer. */
.viewport{perspective:1200px;perspective-origin:50% 50%}
.room{--side:min(78vw,78dvh);--depth:calc(var(--side) * .44);--front:1140px;inset:auto;left:calc((100% - var(--side))/2);top:calc((100% - var(--side))/2);width:var(--side);height:var(--side)}
.back-wall{box-shadow:inset 0 0 80px #26371b99,inset 0 0 4px #25391c}
.letters{width:91%;gap:0;transform:none}
.tile{font-size:clamp(16px,calc(min(78vw,78dvh) * .083),60px);min-height:0;max-height:none;aspect-ratio:.83;padding:0}
.ceiling{background-color:#45573a}.left-wall{background-color:#4b5d3e}.right-wall{background-color:#788566}
@media(max-width:600px){.viewport{perspective:1200px}.room{--side:min(86vw,76dvh);--depth:calc(var(--side) * .4);--front:1140px;inset:auto;left:calc((100% - var(--side))/2);top:calc((100% - var(--side))/2);width:var(--side);height:var(--side)}.letters{width:94%;gap:0}.tile{font-size:calc(min(86vw,76dvh) * .088);min-height:0;max-height:none;aspect-ratio:.83}}
@media(max-height:500px) and (min-width:601px){.room{--side:78dvh;--depth:calc(var(--side) * .44);--front:1140px;inset:auto;left:calc((100% - var(--side))/2);top:calc((100% - var(--side))/2)}.tile{font-size:6.5dvh;max-height:none}}

/* Full-screen clear reveal, with a large central answer and actions. */
.clear-open{overflow:hidden;height:100dvh}.clear-open .reset{visibility:hidden}
.clear-panel{position:fixed;inset:0;z-index:80;display:grid;place-items:center;margin:0;padding:32px 20px;overflow-y:auto;overscroll-behavior:contain;background:rgba(7,17,12,.95);backdrop-filter:blur(12px);text-align:center;animation:clear-screen-in .7s ease both}
.clear-card{width:min(800px,94vw);padding:clamp(26px,5vw,58px) clamp(20px,5vw,62px);border:1px solid #c9b47d;box-shadow:0 0 0 5px #1e3022,0 0 0 6px #8d8058,0 25px 90px #0009;background:radial-gradient(ellipse at 50% 28%,#354630,#1d2d20 70%);animation:clear-card-in 1s cubic-bezier(.2,.8,.2,1) both}
.clear-eyebrow{margin:0 0 22px;font:13px Georgia,serif;letter-spacing:.42em;color:#d9c38a}
.clear-panel .clear-mark{font-family:inherit;font-size:clamp(24px,4.3vw,43px);font-weight:400;line-height:1.6;letter-spacing:.08em;color:#f2edda;margin:0 0 28px}
.clear-answer{background:#f5f0df;color:#263722;padding:clamp(22px,4vw,38px) 15px;margin:0 0 30px;font-size:clamp(38px,7.5vw,76px);letter-spacing:.1em;line-height:1.5;box-shadow:0 8px 28px #10201555}
.clear-answer span{display:block}
.clear-panel .actions{gap:14px}.clear-panel .action{flex:1 1 220px;min-height:58px;padding:16px 22px;font-size:15px;letter-spacing:.06em}
.clear-panel .clear-share{background:#d9c58e;color:#1b2b1f;border-color:#d9c58e}.clear-panel .clear-share:hover{background:#efdfb0}.clear-panel .action.secondary{background:#17261a;color:#eee6cd;border-color:#9ca27a}
.clear-home{display:inline-block;margin-top:26px;padding:8px 15px;font-size:12px;color:#b7bea3;text-decoration:underline;text-underline-offset:5px}
@keyframes clear-screen-in{from{opacity:0}to{opacity:1}}@keyframes clear-card-in{from{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:none}}
@media(max-width:600px){.clear-panel{padding:22px 17px}.clear-card{width:100%;padding:28px 20px}.clear-eyebrow{font-size:11px;margin-bottom:18px}.clear-panel .clear-mark{font-size:24px;margin-bottom:22px}.clear-answer{margin-bottom:24px}.clear-panel .actions{flex-direction:column;gap:12px}.clear-panel .action{flex:auto;font-size:14px;min-height:54px}.clear-home{margin-top:20px}}
@media(max-height:600px) and (min-width:601px){.clear-panel{display:block;padding:24px}.clear-card{margin:auto;padding:25px 35px}.clear-eyebrow{margin-bottom:12px}.clear-panel .clear-mark{margin-bottom:16px;font-size:28px}.clear-answer{font-size:42px;line-height:1.3;padding:15px;margin-bottom:20px}.clear-answer span{display:inline}.clear-home{margin-top:16px}}
@media(prefers-reduced-motion:reduce){.clear-panel,.clear-card{animation:none}}

/* Prominent exit, centered below the puzzle on every screen size. */
.exit{left:50%;right:auto;top:auto;bottom:max(28px,env(safe-area-inset-bottom));transform:translateX(-50%);width:min(360px,calc(100vw - 40px));min-width:0;min-height:68px;padding:18px 26px;gap:13px;border:2px solid #f3e5b8;border-radius:8px;background:#e5d5a6;color:#1c3022;opacity:1;box-shadow:0 8px 32px #07140ddd,0 0 0 4px #192b2088;font-size:19px;font-weight:700;letter-spacing:.07em}
.exit svg{width:30px;height:30px;flex-basis:30px;stroke-width:2}.exit:hover{background:#f5e9c6;color:#15271b}.exit:active{background:#cdbb89}
@media(max-width:600px){.exit{left:50%;right:auto;bottom:max(22px,env(safe-area-inset-bottom));width:min(340px,calc(100vw - 32px));min-width:0;min-height:64px;padding:16px 20px;font-size:18px}}
@media(max-height:500px) and (min-width:601px){.exit{bottom:max(12px,env(safe-area-inset-bottom));min-height:54px;padding:12px 22px;font-size:17px}}

/* Even painted lighting; a slightly raised eye line looking gently down. */
.viewport{background:#828b6c;perspective-origin:50% 50%}
.room{--front:1125px;top:calc((100% - var(--side))/2 + var(--side) * .08);transform:rotateX(calc(-2deg + var(--pitch,0deg))) rotateY(var(--yaw,0deg))}
.surface{background-image:url('texture.svg');background-size:380px 380px;box-shadow:inset 0 0 18px #35482b1a;backface-visibility:visible}
.surface:after{display:none}
.back-wall{background-color:#a6aa88;background-image:radial-gradient(ellipse at 50% 35%,#d8d0a41a,transparent 80%),url('texture.svg');box-shadow:inset 0 0 24px #42533222}
.left-wall{background-color:#85916f;background-image:url('texture.svg')}
.right-wall{background-color:#929b79;background-image:url('texture.svg')}
.ceiling{background-color:#8b9573;background-image:url('texture.svg');box-shadow:inset 0 0 18px #35482b1a}
.floor{background-color:#a29b78;background-image:url('texture.svg');box-shadow:inset 0 0 18px #35482b1a}
.wall-light{background:none}.vignette{background:none;box-shadow:none}.canvas-skin{opacity:.02}
@media(max-width:600px){.room{--front:1125px;top:calc((100% - var(--side))/2 + var(--side) * .08)}}
@media(max-height:500px) and (min-width:601px){.room{--front:1125px;top:calc((100% - var(--side))/2 + var(--side) * .08)}}
@media(prefers-reduced-motion:reduce){.room{transform:rotateX(-2deg)}}

/* Bring the back wall closer while retaining the raised viewing angle. */
.room{--depth:calc(var(--side) * .25)}
@media(max-width:600px){.room{--depth:calc(var(--side) * .24)}}
@media(max-height:500px) and (min-width:601px){.room{--depth:calc(var(--side) * .25)}}