:root{color-scheme:light;--ink:#3d463b;--muted:#7c7d6b;--paper:#faf5e8;--red:#9c443a;--gold:#bc9560;--green:#325e50;--line:#dfd6c1;font-family:'Yu Gothic','Hiragino Kaku Gothic ProN',Meiryo,sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;min-width:280px;background:#203d37;color:var(--ink);background-image:radial-gradient(ellipse at 50% 30%,#466255 0,transparent 65%),repeating-linear-gradient(90deg,#fff0 0 60px,#fff1 61px,#fff0 62px);font-size:15px}button,input{font:inherit}button{cursor:pointer;border:0}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #ba8238;outline-offset:5px}button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}button[data-action=start] svg:first-child,button[data-action=resume] svg:first-child{fill:currentColor;stroke:none}h1,h2,p{margin:0}h1:focus{outline:none}[hidden]{display:none!important}
.site-header{max-width:1180px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:31px 4px 28px;color:#f4ecd7;gap:20px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:inherit}.brand-mark{font-size:32px;color:#d1b279}.brand strong{display:block;font-family:'Yu Mincho','Hiragino Mincho ProN',serif;font-size:20px;letter-spacing:3px;font-weight:500}.brand small{display:block;font-size:8px;letter-spacing:2.8px;margin-top:5px;color:#c0cbb9}.edition{font-size:11px;letter-spacing:1.5px;color:#d5dfca}main{max-width:1180px;margin:0 auto;padding:0 0 8px;overflow:clip}.book-meta{display:flex;align-items:center;justify-content:space-between;color:#d0d9c7;font-size:10px;letter-spacing:1.4px;padding:0 4px 13px}.audio-toolbar{display:flex;align-items:center;justify-content:space-between;background:#eae4d2;border-radius:9px 9px 0 0;padding:10px 21px;gap:10px;color:#616858;border-bottom:1px solid #d4cdb9}.audio-buttons{display:flex;gap:15px}.audio-button{display:flex;align-items:center;gap:7px;background:none;padding:5px 7px;font-size:11px;white-space:nowrap}.audio-button:disabled{opacity:.35}.audio-button[aria-pressed=true]{color:var(--red)}#audio-status{font-size:10px;color:#767d6d}.book{position:relative;display:grid;grid-template-columns:1fr 1fr;min-height:640px;background:var(--paper);border-radius:0 0 8px 8px;isolation:isolate;box-shadow:0 6px 0 #dfd5b9,0 10px 0 #ece3ca,0 13px 0 #ab9d7a,0 22px 50px #091c2080}.book:before{position:absolute;content:'';inset:0;z-index:2;pointer-events:none;border-radius:inherit;opacity:.23;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath fill='%238b7e5e' opacity='.2' filter='url(%23n)' d='M0 0h160v160H0z'/%3E%3C/svg%3E")}.book-spine{position:absolute;left:50%;width:30px;top:0;bottom:0;transform:translateX(-50%);z-index:3;pointer-events:none;background:linear-gradient(90deg,transparent,#897b5730 47%,#98876740 49%,#fff8e6 51%,#95815918 56%,transparent)}.illustration-page{position:relative;padding:57px 36px 55px;background:radial-gradient(ellipse at 50% 40%,#f0eedb,transparent 65%),linear-gradient(90deg,#f3ecdb,#f8f2e2 96%,#e7dec9);display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:0 0 0 8px;min-width:0}.story-page{position:relative;padding:53px 57px 64px;align-self:center;min-width:0}.eyebrow{display:block;color:#957a51;font-size:10px;letter-spacing:1.8px;margin-bottom:24px}h1{font-family:'Yu Mincho','Hiragino Mincho ProN',serif;font-weight:600;line-height:1.48;font-size:clamp(27px,3vw,37px);letter-spacing:1.5px;margin-bottom:26px}.cover-title{font-size:clamp(48px,6.4vw,76px);line-height:1.12;letter-spacing:5px;font-weight:500;color:#345543;margin-bottom:29px}.cover-title span{display:block;font-family:Georgia,serif;font-size:16px;font-weight:400;font-style:italic;letter-spacing:.5px;margin-top:14px;color:#9b7c50}.cover-quote{font-family:'Yu Mincho','Hiragino Mincho ProN',serif;font-size:17px;line-height:1.85;margin-bottom:20px}.intro-description{font-size:12px;line-height:1.9;margin-bottom:25px;color:#767868}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:46px;border-radius:4px;padding:13px 21px;font-size:13px;line-height:1.5}.primary{background:var(--red);color:#fff9e9;box-shadow:0 3px 0 #74332c;transition:background .15s,transform .15s}.primary:hover{background:#8d392f}.primary:active{transform:translateY(2px);box-shadow:0 1px 0 #74332c}.secondary{background:#eee6d3;color:#615d4b;border:1px solid #d6cbb2}.secondary:hover{background:#e4d9bf}.secondary:disabled{opacity:.4}.hero-button{min-width:250px;justify-content:space-between}.start-note{margin-top:14px;font-size:10px;line-height:1.6;color:#8d8878}.scope-note{margin-top:23px;padding-top:17px;border-top:1px solid var(--line);font-size:11px;line-height:1.9;color:#878375}.text-button{background:none;color:#847b66;padding:10px 0;font-size:11px;text-decoration:underline;text-underline-offset:4px}.story-page>.text-button{display:block;margin-top:10px}.page-number{position:absolute;bottom:23px;right:37px;color:#a09376;font:12px Georgia,serif;letter-spacing:2px}.page-corner{position:absolute;bottom:20px;left:30px;width:30px;height:30px;border-left:1px solid #cdbf9d;border-bottom:1px solid #cdbf9d;opacity:.6}.illustration-caption{font-family:'Yu Mincho','Hiragino Mincho ProN',serif;font-size:12px;letter-spacing:1.5px;text-align:center;margin-top:24px;color:#8d856f}.transcript-section{margin-bottom:23px}.speaker{font-size:9px;color:#9b865f;letter-spacing:1px;display:block;margin-bottom:5px}.speech-block p{font-family:'Yu Mincho','Hiragino Mincho ProN',serif;font-size:15px;line-height:2;letter-spacing:.25px}.speech-block+.speech-block{margin-top:17px}.speech-block.santa p{color:#435846}.transcript-toggle{background:none;padding:14px 0 0;font-size:10px;color:#99917d}.interaction-note{font-size:13px;line-height:1.8;margin-top:24px}.examine-button{width:100%;margin:0 0 25px;justify-content:space-between}.exam-finished{font-size:11px;color:#7c805f;margin-bottom:22px}#answer-form{border-top:1px solid var(--line);padding-top:21px}#answer-form label{font-size:12px;font-weight:600}#answer-help{font-size:10px;margin:7px 0 12px;color:#8f8b79}.answer-row{display:flex;align-items:stretch;gap:9px;flex-wrap:wrap}.answer-row input{width:125px;min-width:0;border:1px solid #c6b897;border-radius:4px;background:#fffaf0;color:var(--ink);padding:11px 14px;text-align:center;font-family:Georgia,serif;font-size:25px;letter-spacing:5px;flex:1}.answer-row input[aria-invalid=true]{border-color:var(--red)}.answer-row .primary{font-size:11px;padding:12px 14px;gap:0}.answer-feedback{font-size:11px;line-height:1.8;margin-top:12px;min-height:20px;color:#897d67}.end-note{padding:19px 0;border-top:1px solid var(--line);margin:22px 0 8px}.end-note h2{font-family:'Yu Mincho',serif;font-size:16px;font-weight:500;margin-bottom:10px}.end-note p{font-size:11px;line-height:1.9;color:#837e6d}.reading-nav{display:flex;gap:10px;justify-content:space-between;align-items:center;margin-top:27px;border-top:1px solid var(--line);padding-top:18px}.reading-nav .secondary{font-size:11px;min-height:38px;padding:8px 11px;gap:5px}.reading-nav span{white-space:nowrap;font-size:10px;color:#96876c}.session-bar{display:flex;justify-content:space-between;align-items:center;padding:29px 4px 8px;color:#bac9b6;font-size:10px}.session-bar .text-button{color:#bdcbb7;padding:0}.site-footer{max-width:1180px;margin:0 auto;display:flex;justify-content:space-between;color:#92ac9b;padding:23px 4px 28px;font-size:10px;letter-spacing:1px}
/* 紙のパーツは CSS 3D で起こす。カメラは固定し、探索の操作を増やさない。 */
.diorama{position:relative;width:100%;max-width:480px;height:395px;perspective:900px;isolation:isolate;flex-shrink:0}.night-sky{position:absolute;inset:4px 14px 77px;border-radius:200px 200px 16px 16px;background:linear-gradient(155deg,#56766d,#2f514d 65%,#193e3a);box-shadow:inset 0 0 0 3px #f3ecd7,0 10px 20px #68776135;overflow:hidden;transform:rotateY(-4deg);z-index:-2}.moon{position:absolute;top:28px;right:62px;width:64px;height:64px;border-radius:50%;background:#e0c694;box-shadow:0 0 50px #e9d0a133,inset -9px -4px 0 #c2aa80}.star{position:absolute;font-style:normal;color:#e8d6a6;font-size:22px}.s1{left:26%;top:13%}.s2{right:15%;top:36%;font-size:12px}.s3{left:15%;top:36%;font-size:11px}.s4{left:50%;top:33%;font-size:10px}.snow-specks{position:absolute;inset:0;background-image:radial-gradient(#dce3d2 1px,transparent 1px);background-size:43px 57px;opacity:.32}.paper-ground{position:absolute;bottom:-31px;left:-3%;width:106%;height:240px;border-radius:50%;background:linear-gradient(120deg,#fff9e9,#d9dac8);transform:rotateX(65deg);box-shadow:0 13px 0 #c1c6b3,0 28px 28px #76856e40;z-index:-1}.snow-bank{position:absolute;border-radius:50%;background:linear-gradient(160deg,#fffcef,#e4e5d4);box-shadow:0 5px 0 #cdd2bf80}.snow-bank.back{bottom:60px;left:8%;width:84%;height:90px;transform:rotateX(35deg);z-index:-1}.snow-bank.front{bottom:39px;left:6%;width:87%;height:35px;transform:rotateX(45deg);z-index:8;pointer-events:none}.paper-tree{position:absolute;bottom:79px;width:100px;height:174px;transform-origin:50% 100%;filter:drop-shadow(7px 6px 2px #1e443b25);transform:rotateY(-21deg) rotateZ(-2deg);z-index:1}.paper-tree svg{width:100%;height:100%}.paper-tree i{position:absolute;bottom:-3px;left:44%;height:18px;width:34px;background:#e4e9d8;transform:rotateX(68deg);box-shadow:5px 4px 4px #6b776740}.tree-1{left:3%;height:214px;width:112px;z-index:2}.tree-2{right:0%;height:232px;width:121px;transform:rotateY(24deg)}.tree-3{left:25%;bottom:114px;height:163px;width:82px;z-index:0}.tree-4{right:25%;bottom:125px;height:152px;width:78px;z-index:0}.tree-5{left:14%;bottom:50px;height:123px;width:74px;transform:rotateY(-12deg);z-index:7}.tree-6{right:8%;bottom:45px;height:133px;width:74px;transform:rotateY(26deg);z-index:7}.pop-center{position:absolute;bottom:66px;left:50%;transform:translateX(-50%);z-index:5;width:240px;height:270px;display:flex;align-items:flex-end;justify-content:center;transform-style:preserve-3d}.santa-device{position:relative;width:175px;height:278px;transform-origin:50% 100%;transform:rotateY(-9deg) rotateZ(-3deg);transform-style:preserve-3d;filter:drop-shadow(13px 15px 5px #1c41353d)}.device-rim{height:100%;padding:13px 10px 19px;border:4px solid #9e8763;background:linear-gradient(105deg,#e6d2a2,#bca175);border-radius:25px;box-shadow:-5px 0 0 #f4e2b9,7px 3px 0 #8c795a,8px 3px 0 3px #c2af87;position:relative}.device-screen{height:100%;border-radius:14px;background:#315a4d;position:relative;overflow:hidden;border:2px solid #9a886a;box-shadow:inset 0 0 16px #052e3159}.device-dot{position:absolute;top:5px;left:50%;width:5px;height:5px;background:#6d6f55;border-radius:50%}.device-home{position:absolute;bottom:5px;left:calc(50% - 10px);width:20px;height:6px;background:#937e58;border-radius:5px}.halo{position:absolute;inset:13px -20px 40px;border-radius:50%;background:#a2b38322}.santa-cutout{position:absolute;width:155px;bottom:4px;left:50%;transform:translateX(-50%);filter:drop-shadow(5px 3px 0 #143c3733)}.santa-cutout svg{width:100%;display:block}.device-fold{position:absolute;bottom:-9px;width:84px;height:30px;left:50%;transform:translateX(-50%) rotateX(68deg);background:#e8d8b2;border:1px solid #c3b88f;box-shadow:8px 6px 6px #5b6a5440}.voice-wave{position:absolute;bottom:8px;left:50%;display:flex;gap:3px;align-items:center;height:16px;transform:translateX(-50%)}.voice-wave i{width:3px;height:6px;background:#fff2c8;border-radius:4px}.voice-wave i:nth-child(2n){height:11px}.speaking .voice-wave i{animation:voice .55s alternate infinite}.speaking .voice-wave i:nth-child(2n){animation-delay:.2s}.paper-star{position:absolute;bottom:11px;left:49%;font-size:20px;color:#b59968;transform:rotateX(35deg)}.tiny-gifts{position:absolute;bottom:-1px;left:153px;display:flex;transform:scale(.52);transform-origin:0 100%;z-index:6}.tiny-gifts .gift{margin-left:-20px}.three-boxes-art{display:flex;align-items:flex-end;gap:0;padding-bottom:9px}.three-boxes-art .gift.small{transform:scale(.85);margin:0 -17px 0}.three-boxes-art .gift.red{z-index:2}.box-scene{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;min-height:190px;padding-bottom:6px}.found-caption{position:absolute;width:270px;bottom:-42px;font-size:11px;text-align:center;letter-spacing:1px;color:#746f57;background:#f3f0dfdd;padding:8px;border-radius:20px}.gift{position:relative;display:block;width:164px;height:173px;--box:#b55245;--dark:#8e3d36;--ribbon:#e1bf7c;transform-style:preserve-3d;flex-shrink:0}.gift.blue{--box:#6d9393;--dark:#476f76;--ribbon:#d8c291}.gift.yellow{--box:#d0b264;--dark:#af8a43;--ribbon:#f0dec4}.gift-shadow{position:absolute;bottom:-7px;left:10px;width:154px;height:33px;background:#405c4338;filter:blur(7px);transform:rotateX(45deg)}.gift-base{position:absolute;bottom:7px;left:5px;width:140px;height:117px;background:linear-gradient(105deg,var(--box),var(--dark));border:1px solid #603b3630;box-shadow:inset 2px 0 0 #ffdfca40;background-image:radial-gradient(#ffe1a75e .7px,transparent .7px),linear-gradient(105deg,var(--box),var(--dark));background-size:16px 16px,100% 100%}.gift-side{position:absolute;bottom:7px;right:0;width:19px;height:117px;background:var(--dark);transform:skewY(-24deg);transform-origin:0 100%}.gift-ribbon{position:absolute;bottom:7px;left:62px;width:23px;height:119px;background:linear-gradient(90deg,#d6b575,var(--ribbon),#cbaa67);z-index:2}.gift-top{position:absolute;bottom:108px;left:0;width:164px;height:45px;transform-origin:87% 50%;z-index:5;transform-style:preserve-3d}.gift-lid{position:absolute;bottom:0;left:0;width:155px;height:28px;background:var(--box);box-shadow:0 4px 0 #52363140,-1px 0 0 #eecbbb30}.gift-lid:before{content:'';position:absolute;left:0;bottom:28px;width:155px;height:24px;background:var(--box);filter:brightness(1.15);transform:skewX(-28deg);transform-origin:0 100%}.gift-lid:after{content:'';position:absolute;left:62px;top:0;width:23px;height:28px;background:var(--ribbon)}.gift-bow{position:absolute;bottom:41px;width:44px;height:25px;border:8px solid var(--ribbon);border-radius:30px 24px 4px 30px;left:38px;transform:rotate(23deg)}.gift-bow.right{left:78px;transform:scaleX(-1) rotate(23deg)}.gift-lock{position:absolute;left:61px;bottom:38px;z-index:3;width:26px;height:28px;border-radius:3px;background:#d9bf89;color:#735f3e;text-align:center;font-size:23px;box-shadow:0 2px 0 #715538}.gift.small{width:97px;height:114px;transform:scale(.65);transform-origin:50% 100%;margin:0 12px 0;zoom:1}.gift.small .gift-base{width:84px;height:73px}.gift.small .gift-side{width:10px;height:73px}.gift.small .gift-ribbon{left:38px;width:15px;height:76px}.gift.small .gift-top{bottom:65px;width:96px;height:35px}.gift.small .gift-lid{width:92px;height:19px}.gift.small .gift-lid:before{width:92px;height:15px;bottom:19px}.gift.small .gift-lid:after{left:38px;width:15px;height:19px}.gift.small .gift-bow{left:24px;width:28px;height:18px;border-width:5px;bottom:27px}.gift.small .gift-bow.right{left:49px}.gift.small .gift-lock{left:37px;bottom:23px;width:19px;height:20px;font-size:17px}.gift.small .gift-shadow{width:90px}.opened .gift-top{transform:translate(8px,-76px) rotate(-17deg);animation:box-open .85s cubic-bezier(.2,.8,.2,1) both}.paper{position:absolute;bottom:80px;width:49px;height:67px;background:#fff8e6;border:1px solid #d4c7a1;color:#655540;font:32px 'Yu Mincho',serif;display:grid;place-items:center;box-shadow:3px 5px 0 #e0d7bc,6px 9px 7px #526b4930;z-index:4;animation:paper-rise .8s .22s both}.paper-one{left:29px;transform:rotate(-12deg)}.paper-two{left:84px;transform:rotate(12deg);animation-delay:.34s}.box-choices{display:grid;grid-template-columns:repeat(3,1fr);width:100%;gap:10px;margin-top:21px}.box-choice{display:flex;align-items:center;flex-direction:column;min-width:0;padding:0 6px 14px;border:1px solid #d5c8a5;border-radius:5px;background:#f9f4e5;color:var(--ink);box-shadow:0 3px 0 #e6dcc4}.box-choice .gift{margin-top:-12px;margin-bottom:-16px}.box-choice strong{font-family:'Yu Mincho',serif;font-size:13px;font-weight:500;position:relative}.box-choice>span:last-child{font-size:8px;white-space:nowrap;margin-top:8px;color:#8e8269}.box-choice.available:not(:disabled){border-color:#b96b53;background:#fff8e8}.box-choice.available:not(:disabled):hover{background:#f4e6ce;transform:translateY(-2px)}.box-choice.unavailable{opacity:.63}.inscription{width:100%;max-width:365px;background:#fffaee;border:1px solid #dfd4ba;box-shadow:3px 4px 0 #dcd5bc;padding:22px 25px;margin-top:23px;transform:rotate(-1.5deg);display:flex;align-items:center;justify-content:center;gap:20px;min-height:81px}.clue-notice{font-family:'Yu Mincho',serif;font-size:13px;color:#89816b;line-height:1.8}.clue-words{font-family:'Yu Mincho',serif;display:grid;grid-template-columns:1fr 1fr;column-gap:23px;row-gap:12px;font-size:20px;letter-spacing:2px}.tanuki-clue{display:flex;align-items:center;flex-direction:column;width:91px;flex-shrink:0}.tanuki{width:91px;height:75px}.tanuki-label{font-family:'Yu Mincho',serif;font-size:19px;letter-spacing:3px;margin-top:3px}.crossed{position:relative;display:inline-block}.crossed:before,.crossed:after{content:'';position:absolute;inset:50% -2px;height:2px;background:#a14a3e;transform:rotate(45deg)}.crossed:after{transform:rotate(-45deg)}
dialog{border:1px solid #dfd0b2;background:var(--paper);color:var(--ink);border-radius:8px;padding:35px;width:min(450px,calc(100% - 30px));box-shadow:0 15px 80px #0005}dialog::backdrop{background:#102b2a99}dialog h2{font-family:'Yu Mincho',serif;font-size:23px;margin-bottom:18px}dialog p{font-size:13px;line-height:1.9}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:26px}.noscript{background:#fff6e1;padding:25px}
.page-enter .story-page{animation:page-arrive .6s ease-out}.page-enter .paper-tree,.page-enter .santa-device{animation:paper-unfold .85s cubic-bezier(.2,.75,.2,1) both}.page-enter .tree-2,.page-enter .tree-5{animation-delay:.06s}.page-enter .tree-3,.page-enter .tree-6{animation-delay:.1s}@keyframes page-arrive{from{opacity:.3;transform:translateX(13px) rotateY(-4deg)}to{opacity:1;transform:none}}@keyframes paper-unfold{from{opacity:.35;rotate:x 70deg}to{opacity:1;rotate:x 0deg}}@keyframes box-open{from{transform:translate(0,0) rotate(0)}to{transform:translate(8px,-76px) rotate(-17deg)}}@keyframes paper-rise{from{opacity:0;translate:0 40px}to{opacity:1;translate:0 0}}@keyframes voice{to{height:15px}}
@media(max-width:1240px){.site-header,main,.site-footer{margin-left:28px;margin-right:28px}.story-page{padding:42px 38px 60px}.illustration-page{padding:40px 28px 50px}.diorama{height:370px}.cover-title{font-size:64px}.book{min-height:615px}}
@media(min-width:801px) and (max-width:1000px){.story-page{padding:37px 27px 55px}.illustration-page{padding:37px 22px 45px}.diorama{height:335px}.santa-device{width:149px;height:246px}.santa-cutout{width:135px}.tree-1{width:86px;height:190px}.tree-2{width:90px;height:200px}.tree-5,.tree-6{width:57px}.tree-3,.tree-4{width:65px}.cover-title{font-size:57px}.inscription{padding:18px 16px;gap:12px}.clue-words{font-size:17px;column-gap:17px}.tanuki-clue,.tanuki{width:75px}.audio-toolbar{padding-left:16px;padding-right:16px}.hero-button{min-width:0;width:100%}}
@media(max-width:800px){.site-header{padding:21px 0 19px;margin:0 20px}.brand strong{font-size:17px}.brand small{font-size:7px}.brand-mark{font-size:27px}.edition{font-size:9px;letter-spacing:.5px}main,.site-footer{margin-left:16px;margin-right:16px}.book-meta{font-size:9px;padding-bottom:10px;letter-spacing:.5px}.book{grid-template-columns:1fr;min-height:0}.book-spine{display:none}.illustration-page{padding:28px 34px 24px;border-radius:0;border-bottom:1px solid #e1d8c0;background:linear-gradient(110deg,#f0ebdb,#f9f3e4)}.story-page{padding:30px 35px 56px;align-self:auto}.diorama{max-width:440px;height:360px}.cover .diorama{height:290px;max-width:355px}.cover .santa-device{width:133px;height:220px}.cover .santa-cutout{width:121px}.cover .pop-center{height:220px;bottom:58px}.cover .tree-1{width:79px;height:168px}.cover .tree-2{width:90px;height:187px}.cover .tree-3,.cover .tree-4{height:123px;width:63px;bottom:88px}.cover .tree-5,.cover .tree-6{width:57px;height:102px}.cover .moon{width:47px;height:47px;right:52px;top:22px}.cover .night-sky{bottom:64px}.cover .illustration-page{padding:23px 25px 20px}.cover .illustration-caption{margin-top:4px;font-size:10px}.cover-title{font-size:45px;line-height:1.15;letter-spacing:3px;margin-bottom:20px}.cover-title br{display:none}.cover-title span{font-size:13px;margin-top:9px}.cover .eyebrow{font-size:8px;margin-bottom:14px}.cover .story-page{padding-top:26px}.cover-quote{font-size:16px;margin-bottom:15px}.intro-description{font-size:12px;margin-bottom:20px}.scope-note{font-size:11px}.audio-toolbar{position:sticky;top:0;z-index:20;padding:8px 12px;flex-wrap:wrap;gap:4px}.audio-buttons{gap:10px}.audio-button{font-size:10px;padding:6px 4px;gap:5px}.audio-button svg{width:16px;height:16px}#audio-status{font-size:9px}.illustration-caption{margin-top:16px;font-size:11px}.book .eyebrow{margin-bottom:19px}h1{font-size:31px;margin-bottom:22px}.hero-button{width:100%;min-width:0}.speech-block p{font-size:15px}.clue-words{font-size:21px}.box-choices{max-width:440px}.session-bar{padding-top:24px}.site-footer{padding-top:19px;font-size:9px;letter-spacing:0;gap:15px}.reading-nav .secondary{padding:10px 14px}.inscription{margin-top:20px}.found-caption{bottom:-34px}}
@media(max-width:440px){.site-header{padding:17px 0 16px;margin:0 17px}.brand{gap:9px}.brand strong{font-size:16px}.edition{font-size:8px;width:92px;line-height:1.7;text-align:right}.book-meta{font-size:8px}.audio-toolbar{padding:7px 11px}.audio-buttons{gap:7px}#audio-status{flex-basis:100%;padding-left:4px}.illustration-page{padding:22px 20px 23px}.diorama{height:287px}.pop-center{bottom:53px;height:227px;width:220px}.santa-device{width:132px;height:216px}.santa-cutout{width:120px}.night-sky{inset:4px 5px 62px}.moon{width:44px;height:44px;top:20px;right:44px}.tree-1{width:77px;height:172px;bottom:63px}.tree-2{width:81px;height:184px;bottom:64px}.tree-3,.tree-4{width:58px;height:116px;bottom:88px}.tree-5,.tree-6{width:54px;height:97px;bottom:43px}.paper-ground{bottom:-49px}.snow-bank.back{bottom:50px;height:67px}.snow-bank.front{bottom:32px;height:24px}.paper-star{bottom:4px;font-size:16px}.cover .diorama{height:242px;max-width:320px}.cover .santa-device{width:116px;height:192px}.cover .santa-cutout{width:105px}.cover .pop-center{bottom:47px;height:195px}.cover .tree-1{width:65px;height:146px;bottom:54px}.cover .tree-2{width:70px;height:160px;bottom:56px}.cover .tree-3,.cover .tree-4{width:48px;height:98px;bottom:71px}.cover .tree-5,.cover .tree-6{width:46px;height:84px;bottom:33px}.cover .night-sky{bottom:52px}.cover .moon{width:37px;height:37px;right:40px;top:18px}.cover .illustration-page{padding:15px 19px 16px}.cover .illustration-caption{font-size:9px;margin-top:3px}.cover .story-page{padding:23px 26px 33px}.cover-title{font-size:37px;margin-bottom:15px;letter-spacing:2px}.cover-title span{font-size:11px;margin-top:8px}.cover .eyebrow{margin-bottom:11px}.cover-quote{font-size:14px;line-height:1.75;margin-bottom:12px}.intro-description{font-size:11px;line-height:1.8;margin-bottom:16px}.start-note{font-size:9px;margin-top:11px}.cover .scope-note{font-size:10px;margin-top:15px;padding-top:12px;line-height:1.8}.cover .page-number{bottom:13px;right:19px;font-size:10px}.story-page{padding:27px 26px 52px}h1{font-size:28px;letter-spacing:1px}.eyebrow{font-size:9px}.speech-block p{font-size:14px;line-height:2}.box-choices{gap:7px;margin-top:17px}.box-choice{padding-left:0;padding-right:0}.box-choice strong{font-size:12px}.box-choice>span:last-child{font-size:7px}.box-choice .gift.small{margin:0 0 -17px}.inscription{padding:17px 16px;gap:15px}.clue-words{font-size:18px;column-gap:16px;row-gap:12px;letter-spacing:1px}.tanuki-clue,.tanuki{width:76px}.tanuki{height:62px}.tanuki-label{font-size:17px}.three-boxes-art{transform:scale(.83);transform-origin:center bottom}.box-scene{transform:scale(.86);transform-origin:center bottom}.primary,.secondary{font-size:12px}.answer-row input{width:93px}.answer-row .primary{padding-left:12px;padding-right:12px;font-size:10px}.reading-nav{gap:6px}.reading-nav .secondary{font-size:10px;padding:8px}.dialog-actions{flex-direction:column}.site-footer span:last-child{max-width:140px;text-align:right}.tiny-gifts{left:130px;bottom:-7px;transform:scale(.37)}}
@media(max-width:350px){main,.site-footer{margin-left:10px;margin-right:10px}.site-header{margin-left:13px;margin-right:13px}.brand small{letter-spacing:1.5px}.brand strong{font-size:14px}.edition{width:76px;font-size:7px}.brand-mark{font-size:22px}.cover-title{font-size:32px}.cover .story-page{padding-left:22px;padding-right:22px}.audio-buttons{gap:5px}.audio-button{font-size:9px}.cover .diorama{height:217px}.cover .santa-device{width:104px;height:173px}.cover .santa-cutout{width:94px}.cover .pop-center{bottom:42px}.cover .tree-1{height:129px;width:58px}.cover .tree-2{height:140px;width:60px}.cover .tree-5,.cover .tree-6{width:43px;height:76px}.cover .tree-3,.cover .tree-4{height:89px;bottom:65px}.story-page{padding-left:22px;padding-right:22px}.clue-words{font-size:16px;column-gap:12px}.inscription{gap:9px;padding-left:13px;padding-right:13px}.tanuki-clue,.tanuki{width:64px}.box-choice strong{font-size:11px}.reading-nav .secondary{font-size:9px;padding:7px}.site-footer{font-size:8px}.cover .scope-note{margin-top:12px;padding-top:9px}.cover .eyebrow{font-size:7px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* 全編：絵のそばに調査と回答を置き、本文は別の読み物として残す。 */
.full-book .illustration-page{justify-content:flex-start;padding:35px 30px 45px}.full-book.cover .illustration-page{justify-content:center}.scene-controls{width:100%;max-width:420px;margin:22px auto 0;position:relative;z-index:4}.scene-controls .primary,.scene-controls>.secondary{width:100%}.scene-controls .examine-button{margin-bottom:15px}.full-book .diorama{width:100%;flex-shrink:0}.full-clue{width:100%;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:15px;margin-top:15px;position:relative;z-index:4}.full-clue .clue-writing{width:100%;font-family:'Yu Mincho',serif;font-size:16px;line-height:1.8;text-align:center}.mountain-clue{width:150px;height:80px}.hand-clues{display:flex;gap:14px;font-size:25px}.hand-clues span{display:flex;flex-direction:column;align-items:center}.hand-clues small{font-size:11px;margin-top:7px;color:#746f60}.hub-title{font-family:'Yu Mincho',serif;font-size:18px;text-align:center;margin:35px 0}.full-boxes{width:100%;margin-top:45px;margin-bottom:30px}.full-boxes .box-choice{min-height:190px;padding-top:20px}.full-boxes .box-choice>span:last-child{font-size:9px}.paper-collection{display:flex;flex-wrap:wrap;justify-content:center;gap:13px;margin:24px 0 10px}.letter-paper{display:flex;width:43px;height:58px;align-items:center;justify-content:center;font-family:'Yu Mincho',serif;font-size:25px;border:1px solid #d1c39f;background:#fffaf0;box-shadow:2px 4px 0 #ddcfad;transform:rotate(-4deg);border-top:3px solid #a14a3c}.letter-paper.blue{border-top-color:#528398;transform:rotate(3deg)}.letter-paper.yellow{border-top-color:#c4a649;transform:rotate(-2deg)}.large-papers .letter-paper{width:55px;height:70px;font-size:32px}.collected-count{text-align:center;font-size:10px;color:#8c7d61}.lock-label{font-size:12px;text-align:center;line-height:1.7;margin-bottom:13px}.dial-lock{display:flex;gap:10px;justify-content:center;background:#ded1b4;border:1px solid #bbab86;padding:10px;border-radius:9px;box-shadow:inset 0 3px 8px #927b4430}.dial-column{display:flex;flex-direction:column;align-items:center;flex:1;max-width:65px}.dial-column output{font:32px Georgia,serif;color:#493e30;background:#fff9e9;border:1px solid #c1b08c;text-align:center;line-height:1.55;width:100%;box-shadow:inset 0 3px 5px #58402520}.dial-step{min-width:44px;min-height:44px;width:100%;background:#eee6d3;color:#6e6249;font-size:26px;line-height:1;border-radius:3px}.dial-step:active{background:#d5c59f}.lock-submit{margin-top:14px}.scene-controls .text-button{display:block;margin:5px auto}.historical-note{font-size:11px;text-align:center;color:#82745e;line-height:1.8;margin-bottom:12px}.information-button{margin-bottom:16px}.word-answer-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.word-answer-row input{width:100%;min-height:48px;border:1px solid #bcae90;border-radius:4px;background:#fffaf0;color:#3d463b;padding:10px 13px;font-size:18px}.word-answer-row input[aria-invalid=true]{border-color:#9c443a}#spell-form label,#reply-form label{font-size:12px;font-weight:600}.invite-actions{display:flex;flex-direction:column;gap:12px}.question-card,.response-card{font-family:'Yu Mincho',serif;font-size:15px;line-height:2;margin-bottom:22px;padding:18px;background:#fffaf0;border-left:2px solid #c5ad7e}.quiz-choices{display:flex;flex-direction:column;gap:10px}.quiz-choices .secondary{width:100%;min-height:48px}.thinking-note{font-size:11px;line-height:1.8;text-align:center;color:#887c66;margin-top:15px}.secret-entry{margin-top:18px;font-size:11px;color:#7e725e}.secret-entry summary{cursor:pointer;padding:12px 0}.secret-entry p{line-height:1.8;margin:12px 0}.secret-entry form{padding-top:10px}.sound-settings{color:#bac9b6;font-size:11px;margin:8px 4px 15px}.sound-settings summary{padding:10px 0;cursor:pointer}.sound-settings button{margin:8px 8px 8px 0;min-height:40px;font-size:11px}.sound-settings p{line-height:1.9;max-width:720px}.sound-settings a{color:#e2c992}.magician-stand{width:175px;height:250px;filter:drop-shadow(6px 9px 4px #23362b40);position:relative;transform:rotate(-4deg)}.witch-cutout{width:175px;height:250px}.free-santa{position:relative;width:180px;height:260px;filter:drop-shadow(5px 8px 4px #30453640)}.free-santa svg{width:100%;height:100%}.rescue-spark{position:absolute;right:-20px;top:20px;color:#e4c480;font-size:60px}.mystery-star{font-size:100px;color:#c8ad78;text-shadow:4px 6px 0 #dec99a}
@media(max-width:800px){.full-book .illustration-page{padding:22px 25px 28px}.full-book .story-page{padding-top:25px}.full-book .scene-controls{max-width:430px;margin-top:18px}.full-book .hub-title{margin:18px 0 20px;font-size:16px}.full-boxes{margin:12px 0 20px}.full-boxes .box-choice{min-height:160px}.full-book .inscription{margin-top:10px}.full-book .illustration-caption{margin-top:12px}.full-book .scene-controls .primary{font-size:13px}.full-book .scene-controls .secondary{font-size:12px}.full-book .magician-stand{height:205px;width:160px}.full-book .witch-cutout{height:205px;width:160px}.full-book .free-santa{height:210px;width:160px}.full-book .dial-lock{gap:8px}.full-book .dial-column output{font-size:29px}.full-book .full-clue .clue-writing{font-size:14px}.full-book .hand-clues{gap:10px;font-size:23px}.large-papers .letter-paper{width:40px;height:54px;font-size:25px}.paper-collection{gap:9px}.full-book .question-card{font-size:14px;padding:15px}.full-book .story-page .scope-note{font-size:11px}.sound-settings{margin-left:15px;margin-right:15px}.full-book .gift.opened.small .paper{font-size:14px}.full-book .answer-row input{font-size:24px}}
@media(max-width:800px){.full-book[data-phase=box] .diorama{height:205px;overflow:clip}.full-book[data-phase=box] .pop-center{height:158px;bottom:35px}.full-book[data-phase=box] .box-scene{transform:scale(.66)}.full-book[data-phase=box] .night-sky{bottom:43px}.full-book[data-phase=box] .illustration-caption{margin-top:5px}.full-book[data-phase=box] .scene-controls{margin-top:12px}}