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rotate(-25deg);opacity:0}to{transform:scale(1) rotate(-10deg)}}@keyframes confetti{to{transform:translateY(100svh) rotate(420deg);opacity:0}}@keyframes shake{25%,75%{transform:translateX(-6px)}50%{transform:translateX(6px)}}@keyframes pulse{50%{box-shadow:0 0 0 10px #77a88622}}@keyframes delivery{to{transform:translate(250px,-50px) rotate(-12deg);opacity:0}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(min-aspect-ratio:2/1){.topbar{height:70px;padding:13px 4%}.map-intro{top:21%}.map-intro h1{font-size:40px}.map-rabbit{height:51%}.greeting{bottom:24%;padding:10px 16px;font-size:11px}.continue-card{bottom:20%;padding:12px 16px}.pin-disc{width:50px;height:50px;border-radius:18px}.pin-disc svg{width:25px;height:25px}.pin-sign{padding:7px 13px}.pin-sign strong{font-size:13px}.dock{bottom:15px}.dock button{padding:9px 16px}.lesson-layout{margin-top:4px;grid-template-columns:170px 1fr;gap:20px;min-height:calc(100svh - 105px)}.guide-character{max-height:250px}.guide-bubble{font-size:12px;padding:13px}.learning-card{min-height:250px;padding:17px}.big-pinyin{font-size:76px}.quiz-title{font-size:18px;margin:4px 0 8px}.quiz-sound{width:54px;height:54px;margin:4px auto 10px;border-radius:18px}.choices{margin:10px 0}.choice{min-height:68px;min-width:85px;font-size:30px}.hint{margin-top:8px;font-size:12px}.writing-grid{width:150px;height:150px}.lesson-actions .primary{padding:10px 18px;min-height:42px}.target-envelope{min-height:55px;margin-bottom:5px}.step-nav{margin:0}.lesson-main{gap:10px}.lesson-layout{margin-bottom:15px}.read-lines{gap:5px}.read-line{padding:8px 12px}.read-line small{font-size:11px}.read-line strong{font-size:13px}}@media(max-width:800px){.topbar{padding:13px 3%;height:72px}.brand-mark{width:40px;height:40px;font-size:33px;border-radius:13px}.brand{gap:8px}.brand strong{font-size:20px;letter-spacing:2px}.brand small{font-size:8px;letter-spacing:2px}.header-actions{gap:7px}.header-pill{padding:8px 11px;font-size:10px}.round{width:37px;height:37px}.parent-btn{padding:9px 11px;font-size:11px}.map-intro{left:4%;top:24%}.map-intro h1{font-size:34px}.map-intro p{font-size:11px;letter-spacing:0}.map-intro .eyebrow{font-size:8px}.pin-disc{width:49px;height:49px;border-radius:18px;border-width:3px}.pin-disc svg{width:25px;height:25px}.pin-sign{padding:7px 9px;min-width:84px;border-radius:10px;margin-top:6px}.pin-sign strong{font-size:11px}.pin-sign small{font-size:8px;letter-spacing:0}.pin-tag{font-size:8px;padding:4px 7px;margin-top:6px}.pin-0{left:32%;top:44%}.pin-1{left:49%;top:26%}.pin-2{left:66%;top:44%}.pin-3{left:81%;top:23%}.map-rabbit{height:42%;width:23%}.greeting{left:15%;bottom:20%;font-size:10px;padding:10px 13px;max-width:160px}.continue-card{right:3%;bottom:19%;min-width:190px;gap:10px;padding:12px 14px;border-radius:17px}.continue-card strong{font-size:14px;margin-top:5px}.continue-card small{font-size:8px}.continue-card .primary{padding:10px 12px;min-height:39px;font-size:11px;border-radius:12px}.continue-card .primary svg{width:15px}.dock{bottom:14px;border-radius:19px;padding:5px}.dock button{padding:9px 14px;font-size:11px;border-radius:14px;gap:5px}.dock svg{width:18px;height:18px}.tiny-label{display:none}.lesson-layout{width:94%;grid-template-columns:150px 1fr;gap:16px;margin-top:0}.learning-card{padding:18px;min-height:255px;border-radius:23px}.guide-bubble{font-size:11px;padding:12px 14px;max-width:165px}.guide-character{max-height:250px}.lesson-meta{font-size:10px}.lesson-actions{gap:10px}.lesson-actions>span{font-size:9px}.step-nav{gap:6px}.step-nav span{font-size:10px;gap:4px}.step-nav i{width:19px;height:19px;font-size:9px}.quiz-title{font-size:17px;margin:4px 0 10px}.choice{min-width:77px;min-height:68px;font-size:29px;padding:12px}.choices{gap:10px}.big-pinyin{font-size:75px}.hint{font-size:12px;margin-top:10px}.example-word{font-size:16px}.lesson-actions .primary{font-size:12px;min-width:130px;padding:11px 16px}.back-link{font-size:11px}.panel-head{padding:20px 22px 15px}.panel-head h2{font-size:20px}.panel-body{padding:18px 22px}.lesson-list{gap:8px}.lesson-row{padding:11px;gap:9px;min-height:62px}.lesson-row strong{font-size:12px}.catalog-card{min-height:83px;padding:12px 6px}.catalog-card strong{font-size:23px}.guide-column{justify-content:flex-end}.parent-btn span{display:none}.header-pill .passport-label{display:none}.card-eyebrow{font-size:9px}.quiz-feedback{font-size:12px}.choice.long-choice{font-size:14px;min-width:110px}.target-envelope{font-size:26px;padding:10px 22px}.lesson-group-preview{margin-top:10px}}@media(max-height:460px) and (orientation:landscape){.world{min-height:100svh}.topbar{height:61px;padding-top:9px;padding-bottom:9px}.map-intro{top:23%}.map-intro h1{font-size:30px}.map-intro p{margin-top:8px}.pin-0{top:42%}.pin-1{top:25%}.pin-2{top:40%}.pin-3{top:20%}.pin-tag{display:none}.map-rabbit{height:48%}.greeting{bottom:24%;font-size:9px}.continue-card{bottom:18%}.dock{bottom:9px}.dock button{padding:8px 12px}.lesson-layout{grid-template-columns:115px 1fr;gap:13px;min-height:calc(100svh - 75px);margin-bottom:12px}.guide-bubble{font-size:10px;padding:10px}.guide-character{max-height:195px}.lesson-main{gap:7px}.learning-card{min-height:220px;padding:12px}.lesson-meta{font-size:9px}.lesson-progress{margin-top:5px}.lesson-progress i{height:3px}.big-pinyin{font-size:62px;margin:0}.hint{font-size:10px;margin-top:7px;line-height:1.7}.pronounce-button{font-size:10px;padding:7px 11px;min-height:34px}.pronounce-button svg{width:17px}.example-word{font-size:13px;margin-top:8px}.step-nav span{font-size:9px}.quiz-title{font-size:15px;margin-bottom:5px}.quiz-sound{width:43px;height:43px;margin-bottom:5px;border-radius:15px}.quiz-sound svg{width:23px}.choice{min-height:57px;font-size:26px;min-width:70px;border-radius:14px;padding:8px 14px}.choices{margin:8px 0}.quiz-feedback{font-size:10px;min-height:20px;margin-top:6px}.lesson-actions .primary{min-height:36px;padding:8px 16px;font-size:11px}.lesson-actions>span{display:none}.help-button{font-size:10px;padding:5px}.writing-grid{width:125px;height:125px}.writing-heading{font-size:10px}.writing-status{font-size:10px;margin:6px 0}.celebration{min-height:calc(100svh - 65px)}.big-star{width:75px;height:75px;border-radius:25px}.big-star svg{width:43px;height:43px}.celebration h1{font-size:25px;margin:20px 0 8px}.celebration p{font-size:12px}.celebration .primary{margin-top:20px}.target-envelope{min-height:45px}.target-envelope .slot{height:32px;font-size:24px;min-width:30px}.build-tokens .choice{min-height:45px;min-width:50px;font-size:24px}.lesson-group-preview button{font-size:15px;padding:4px 10px}.read-line strong{font-size:12px}.read-line small{font-size:10px}.read-lines{margin:7px 0}.story-note{font-size:9px}}@media(orientation:portrait) and (max-width:800px){body:not(.allow-portrait) .rotate-notice{display:flex;position:fixed;inset:0;z-index:30;align-items:center;justify-content:center;flex-direction:column;background:#f5f0df;padding:30px;text-align:center}.rotate-notice>span{font-size:80px;color:#3c8a76}.rotate-notice h2{font-size:22px;margin:20px 0 15px}.rotate-notice p{font-size:13px;color:#8b967e}.rotate-notice button{margin-top:30px;background:#357e68;color:#fff9e8;border-radius:14px;padding:14px 20px}.allow-portrait .city-world{min-height:850px}.allow-portrait .map-intro{top:15%}.allow-portrait .pin-0{left:8%;top:39%}.allow-portrait .pin-1{left:59%;top:31%}.allow-portrait .pin-2{left:36%;top:51%}.allow-portrait .pin-3{left:65%;top:64%}.allow-portrait .map-rabbit{height:29%;width:44%}.allow-portrait .greeting{bottom:22%;left:8%}.allow-portrait .continue-card{bottom:12%}.allow-portrait .header-pill{display:none}.allow-portrait .lesson-layout{display:block}.allow-portrait .guide-column{display:none}.allow-portrait .lesson-main{min-height:calc(100svh - 95px)}.allow-portrait .learning-card{min-height:400px}.allow-portrait .catalog-grid{grid-template-columns:repeat(3,1fr)}.allow-portrait .catalog-grid.wide-grid,.allow-portrait .lesson-list{grid-template-columns:1fr}.allow-portrait .catalog-controls{flex-wrap:wrap}.allow-portrait .stats{grid-template-columns:1fr 1fr}.allow-portrait .panel-body{padding:16px}.allow-portrait .tabs button{padding:8px 10px}.allow-portrait .parent-btn{font-size:0}}
/* The original companion illustration is framed as a portrait; no generated cutout is assumed. */
.map-rabbit{object-fit:cover;object-position:left center;width:19%;height:38%;left:3%;bottom:8%;border:5px solid #fff9e9;border-radius:47% 47% 25% 25%;box-shadow:0 8px 25px #23492f33;filter:none}.guide-character{object-fit:cover;object-position:left center;height:310px;max-height:310px;border:5px solid #fff9e9;border-radius:45% 45% 22px 22px;margin-top:40px;box-shadow:0 8px 25px #23492f12}.greeting{left:18%;bottom:27%}@media(max-width:800px){.map-rabbit{height:35%;bottom:9%;width:20%}.greeting{left:17%;bottom:26%;max-width:150px}.guide-character{height:235px;max-height:235px;border-width:3px}}@media(max-height:460px) and (orientation:landscape){.guide-character{height:180px;max-height:180px;margin-top:28px}.greeting{left:17%;bottom:27%;font-size:9px}.map-rabbit{bottom:5%;height:37%}}@media(orientation:portrait) and (max-width:800px){.allow-portrait .map-rabbit{width:38%;height:26%;bottom:10%}.allow-portrait .greeting{left:10%;bottom:34%}}
.city-world .brand{background:#fff9e9eb;border-radius:20px;padding:7px 14px 7px 7px;box-shadow:0 4px 18px #324a241c}.city-world .topbar{padding-top:18px;padding-bottom:18px}
@media(max-height:460px) and (orientation:landscape){.topbar{height:52px}.city-world .topbar{padding-top:5px;padding-bottom:5px}.brand strong{font-size:17px}.brand small{font-size:7px;margin-top:3px}.brand-mark{height:34px;width:34px;font-size:28px}.city-world .brand{padding:4px 10px 4px 4px;border-radius:15px}.lesson-layout{height:calc(100svh - 64px);min-height:0}.lesson-main{gap:5px;min-height:0}.learning-card{min-height:0;padding:8px 12px}.lesson-actions .back-link{padding:7px 0}.step-nav{margin:0}.quiz-sound{height:34px;width:38px;margin:2px auto 4px;flex-shrink:0}.quiz-title{font-size:14px;line-height:1.5;margin:3px 0 4px}.choices{margin:4px 0}.quiz-feedback{margin-top:3px;min-height:17px}.choice{min-height:51px;padding:5px 12px}.guide-character{height:150px;max-height:150px;margin-top:32px}.guide-bubble{font-size:9px;line-height:1.7}.target-envelope{padding:7px 20px;margin:0 0 4px;min-height:38px}.writing-grid{height:116px;width:116px}.writing-heading{font-size:9px}.writing-status{margin:3px 0}.demo-writing{min-height:27px;padding:4px 12px;font-size:10px}.card-eyebrow{font-size:8px}.read-line{padding:5px 9px}.read-line small{font-size:9px}.read-line strong{font-size:11px}.read-lines{gap:4px}.story-note{line-height:1.4}.hint{margin-top:6px}}
.pinyin{font-family:'Comic Sans MS','Chalkboard SE','Arial',sans-serif}.choice.long-choice{overflow-wrap:anywhere}.target-envelope{max-width:100%}.target-envelope>span{overflow-wrap:anywhere}.target-envelope:has(>span:not(.slot)){font-size:clamp(16px,2.5vw,30px)}
.tone-rail{width:270px;height:88px;margin:8px 0 0;position:relative}.tone-rail>svg{width:100%;height:80px}.tone-rail small{position:absolute;bottom:-5px;left:0;width:100%;font-size:10px;color:#8a9c7f}.tone-tram{position:absolute;display:grid;place-items:center;background:#318373;color:#fff9e0;width:29px;height:29px;border-radius:8px;box-shadow:0 3px 0 #235f56;left:5%;top:8%;animation:tram-flat 3s ease-in-out infinite}.tone-tram svg{width:20px}.tone-2 .tone-tram{animation-name:tram-up}.tone-3 .tone-tram{animation-name:tram-dip}.tone-4 .tone-tram{animation-name:tram-down}.tone-5 .tone-tram{top:30%}.mail-delivery{position:absolute;left:50%;top:50%;display:flex;align-items:center;gap:12px;padding:14px 24px;background:#fff0c7;color:#277963;border:2px solid #e5c678;border-radius:14px;box-shadow:0 8px 30px #30522a33;animation:letter-arrives 1.7s ease both;font-size:18px;font-weight:600;pointer-events:none}.mail-delivery svg{width:35px;height:35px}.target-envelope.received{background:#e7efd5;border-color:#97bc87}.choice.correct:after{content:' ✓';font-family:Arial,sans-serif}@keyframes letter-arrives{0%{transform:translate(-170%,-50%) rotate(-12deg);opacity:0}25%{transform:translate(-50%,-50%) rotate(3deg);opacity:1}75%{transform:translate(-50%,-50%) rotate(0);opacity:1}100%{transform:translate(150%,-100%) rotate(-12deg);opacity:0}}@keyframes tram-flat{0%,15%{left:5%}85%,100%{left:85%}}@keyframes tram-up{0%,15%{left:5%;top:55%}85%,100%{left:85%;top:5%}}@keyframes tram-dip{0%,15%{left:5%;top:12%}50%{left:45%;top:60%}85%,100%{left:85%;top:8%}}@keyframes tram-down{0%,15%{left:5%;top:5%}85%,100%{left:85%;top:65%}}@media(max-height:460px) and (orientation:landscape){.tone-rail{width:160px;height:55px;margin:0}.tone-rail>svg{height:50px}.tone-tram{width:22px;height:22px;border-radius:6px}.tone-tram svg{width:16px;height:16px}.tone-rail small{font-size:8px}.mail-delivery{padding:10px 17px;font-size:14px}.mail-delivery svg{width:24px;height:24px}}
/* Long stories stay readable from their first line, including small landscape screens. */
.learning-card{overflow-y:auto;justify-content:safe center;overscroll-behavior:contain}.learning-card>*{flex-shrink:0}.round{min-width:44px;min-height:44px}.header-pill,.parent-btn{min-height:44px}.lesson-actions button,.pronounce-button,.quiz-sound,.lesson-group-preview button,.demo-writing{min-height:44px}
@media(max-height:460px) and (orientation:landscape){.learning-card:has(.tone-rail) .big-pinyin{font-size:48px;line-height:1.2}.writing-grid{height:100px;width:100px}.demo-writing{min-height:44px}.lesson-actions .primary{min-height:44px}.lesson-group-preview{margin-top:5px}}
@media(max-height:460px) and (orientation:landscape){.learning-card:has(.tone-rail) .big-pinyin{font-size:38px}.learning-card:has(.tone-rail) .hint{font-size:9px;line-height:1.4;margin-top:3px}.tone-rail{height:46px}.tone-rail>svg{height:40px}.tone-rail small{bottom:-1px}}
/* Pronunciation practice keeps the current sound and its example visibly separate. */
.pronunciation-controls{width:100%;text-align:center}.pronunciation-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.pronunciation-actions button{min-width:44px;min-height:44px;justify-content:center}.primary-voice{background:#e0edda;border-color:#bacdaf;color:#276e55;font-weight:700}.example-voice{background:#fff9ec;border-color:#e5ddc9;color:#7c795f}.pronunciation-demo{font-size:12px;color:#63836c;margin-top:9px;line-height:1.6}.playback-status{min-height:18px;font-size:11px;line-height:18px;color:#28785e}.pronunciation-hint{margin-top:6px}.sound-comparison{width:min(100%,520px);margin:14px auto 0;border-top:1px solid #e9e8d6;padding-top:12px}.comparison-heading{display:flex;align-items:center;justify-content:space-between;gap:9px;flex-wrap:wrap}.comparison-heading h3{font-size:13px;font-weight:600;color:#6e8066}.sequence-button{display:flex;align-items:center;justify-content:center;gap:4px;min-height:44px;background:#f0f3e6;border-radius:12px;padding:8px 12px;font-size:11px;color:#51816a}.sequence-button svg{width:16px;height:16px}.sound-comparison .tone-grid{gap:8px;margin:8px 0 0;flex-wrap:wrap}.sound-comparison .tone-cell{padding:0;min-width:74px;flex:1;max-width:104px;gap:0;background:transparent}.sample-button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:64px;min-height:66px;padding:8px 12px;border:1px solid #e2e5d4;border-radius:13px;background:#f3f1e3;color:#457a63}.sound-comparison .tone-cell .sample-button{width:100%;background:#f3f1e3}.sample-button strong{font-size:24px;line-height:1.3}.sample-button small{font-size:10px;color:#74856b;letter-spacing:0}.spelling-samples{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:8px}.spelling-samples .sample-button{flex:1;max-width:114px}.comparison-note{font-size:11px;line-height:1.7;color:#839079;margin-top:8px}.is-playing,.sound-comparison .tone-cell .is-playing{background:#d4e9cc!important;border-color:#78a785;color:#205e48;box-shadow:0 0 0 2px #8cb99a}.tone-cell .back-link{min-height:44px;padding:8px 10px;justify-content:center;font-size:11px}.lesson-group-preview{flex-wrap:wrap;justify-content:center}.lesson-group-preview button{min-width:44px}.panel-body>.pronunciation-controls{margin-top:12px}.detail-heading .pronunciation-hint{margin-left:auto;margin-right:auto}.lesson-main{min-height:0}.learning-card{min-height:0}.lesson-actions{flex-shrink:0}
@media(orientation:landscape){.lesson-layout{height:calc(100svh - 125px);min-height:0;margin-bottom:18px}.learning-card{flex:1 1 0}.learning-card:has(.pronunciation-controls){padding:20px}.learning-card:has(.pronunciation-controls) .big-pinyin{font-size:76px;line-height:1.2}}
@media(min-aspect-ratio:2/1){.lesson-layout{height:calc(100svh - 90px)}}
@media(max-width:800px) and (orientation:landscape){.lesson-layout{height:calc(100svh - 90px)}}
@media(max-height:460px) and (orientation:landscape){.lesson-layout{height:calc(100svh - 64px);margin-bottom:12px}.learning-card:has(.pronunciation-controls){padding:12px}.learning-card:has(.pronunciation-controls) .big-pinyin{font-size:48px}.pronunciation-actions{gap:6px}.pronunciation-actions button{padding:7px 10px;font-size:10px}.pronunciation-demo{font-size:10px;margin-top:6px}.playback-status{font-size:10px;min-height:16px;line-height:16px}.learning-card:has(.tone-rail) .pronunciation-hint,.pronunciation-hint{font-size:10px;line-height:1.7}.sound-comparison{margin-top:9px;padding-top:8px}.comparison-heading h3{font-size:11px}.sequence-button{font-size:10px;padding:7px 9px}.sound-comparison .tone-cell{min-width:62px}.sample-button{min-height:58px;padding:6px 9px}.sample-button strong,.sound-comparison .tone-cell .pinyin{font-size:21px}.comparison-note{font-size:10px}.detail-heading{margin-bottom:10px}.detail-heading .big-pinyin{font-size:48px}}
.learning-card{scrollbar-color:#afc5a2 #f5f5e9;scrollbar-width:thin}.learning-card::-webkit-scrollbar{width:7px}.learning-card::-webkit-scrollbar-thumb{background:#afc5a2;border:2px solid #fffdf4;border-radius:8px}.learning-card::-webkit-scrollbar-track{background:#f5f5e9;border-radius:8px}
.panel-head{position:sticky;top:0;z-index:2;background:#fff9ec}
.quiz-sound{min-width:44px}
.tone-context{font-size:10px;line-height:1.5;letter-spacing:0;color:#75856c;overflow-wrap:anywhere}
/* Stroke-by-stroke practice keeps a large surface and visible accumulated progress. */
.writing-host.stroke-writing{width:min(520px,100%);display:grid;grid-template-columns:1fr;gap:10px}
.stroke-writing .writing-heading{flex-wrap:wrap;justify-content:center;gap:6px 16px;font-size:12px}
.stroke-writing .writing-grid{width:260px;height:260px;max-width:100%;border:1px solid #e0e6d8;cursor:crosshair;user-select:none}
.writing-controls{display:flex;flex-direction:column;align-items:center;gap:8px}
.writing-tip{font-size:12px;color:#71876b;line-height:1.6}
.stroke-writing .writing-status{margin:0;font-size:12px;line-height:1.6;min-height:20px}
.writing-tools{display:flex;gap:8px;justify-content:center}
.stroke-writing .writing-tools button{min-height:44px;padding:10px 16px;font-size:12px}
.writing-progress{width:100%;max-width:230px;height:10px;accent-color:#258579}
@media(orientation:landscape) and (min-height:601px){
 .writing-host.stroke-writing{width:min(620px,100%);grid-template-columns:280px minmax(180px,1fr);gap:18px;align-items:center}
 .stroke-writing .writing-heading{grid-column:1/-1}
 .stroke-writing .writing-grid{width:280px;height:280px}
 .writing-controls{gap:14px}
}
@media(orientation:landscape) and (max-height:600px){
 .learning-card:has(.stroke-writing){padding:10px 14px;gap:4px}
 .learning-card:has(.stroke-writing)>.card-eyebrow{display:none}
 .writing-host.stroke-writing{grid-template-columns:minmax(174px,240px) minmax(160px,1fr);column-gap:16px;row-gap:6px;align-items:center}
 .stroke-writing .writing-heading{grid-column:1/-1;font-size:11px}
 .stroke-writing .writing-grid{width:210px;height:210px}
 .writing-controls{gap:10px}
 .stroke-writing .writing-tools button{padding:8px 10px}
}
@media(orientation:landscape) and (max-height:460px){
 .lesson-main:has(.stroke-writing) .lesson-meta,.lesson-main:has(.stroke-writing) .lesson-progress{display:none}
 .writing-host.stroke-writing{grid-template-columns:174px minmax(145px,1fr);column-gap:10px;row-gap:3px}
 .stroke-writing .writing-grid{width:174px;height:174px}
 .writing-tip,.stroke-writing .writing-status{font-size:10px}
 .stroke-writing .writing-tools button{padding:8px;font-size:11px}
}