@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Nunito:wght@500;600;700;800;900&display=swap');
:root{--ink:#183044;--ink2:#30475a;--muted:#6a7d89;--cream:#fbf7ee;--paper:#fff;--line:#dfebe9;--teal:#197b83;--teal-dark:#14666c;--blue:#e9f4f6;--yellow:#ffdc94;--orange:#f2a779;--shadow:0 13px 32px rgba(17,51,69,.075)}
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15px;border-radius:11px;font-size:12px;line-height:1.55;font-weight:800;margin-top:14px}.feedback.good{background:#e1f4e7;color:#2e7651}.feedback.try{background:#fff0e4;color:#9a5a30}.feedback.info{background:#eaf2f9;color:#4e6c84}.question-progress{height:7px;border-radius:100px;background:#edf3f1;margin-top:26px;overflow:hidden}.question-progress span{display:block;height:100%;background:var(--teal);border-radius:100px}.train-card{overflow:hidden}.train-world{position:relative;background:linear-gradient(#d7eef3 0,#e9f7f7 65%,#f5f0d9 66%);border:1px solid #c7e4e8;border-radius:16px;height:360px;overflow:hidden}.sky-label{position:absolute;top:13px;left:17px;font-size:10px;color:#4d8190;font-weight:900}.cloud-track{position:absolute;top:41px;left:0;right:0;height:183px;display:flex;align-items:start;gap:12px;padding:15px 17px;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin}.train-cloud{position:relative;flex:0 0 108px;min-width:108px;min-height:69px;border:2px solid #b7dbe1;border-radius:44px;background:#fff;color:var(--ink);font-size:11px;line-height:1.25;font-weight:900;padding:8px;box-shadow:0 6px 0 rgba(108,155,160,.13);animation:cloudDrift 4s ease-in-out infinite alternate}.train-cloud:nth-child(even){margin-top:60px;animation-duration:5s}.train-cloud:nth-child(3n){margin-top:25px;animation-duration:3.5s}.train-cloud:before,.train-cloud:after{content:'';position:absolute;background:#fff;border-top:2px solid #b7dbe1;border-radius:50%;z-index:-1}.train-cloud:before{width:41px;height:28px;left:18px;top:-16px}.train-cloud:after{width:44px;height:32px;right:17px;top:-20px}.train-cloud:hover{border-color:var(--teal);transform:translateY(-3px)}.train-cloud.cloud-wrong{animation:cloudShake .4s ease-in-out}.train-cloud.cloud-popped{opacity:0;transform:scale(.2);transition:opacity .25s,transform .25s}.train-ground{position:absolute;left:0;right:0;bottom:0;height:120px}.train-moving{position:absolute;bottom:18px;left:11%;display:flex;align-items:end;gap:0;animation:trainTravel 5s ease-in-out infinite alternate}.engine{font-size:58px;line-height:1;filter:drop-shadow(0 5px 2px rgba(46,57,55,.2))}.carriage{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:210px;min-height:71px;border:4px solid #255e65;border-radius:11px 11px 15px 15px;background:#f4aa6c;color:#143740;position:relative;padding:5px 12px;text-align:center}.carriage:before,.carriage:after{content:'';position:absolute;bottom:-17px;width:21px;height:21px;border-radius:50%;background:#293b42;border:3px solid #a9bcc2}.carriage:before{left:28px}.carriage:after{right:27px}.carriage strong{font-size:13px}.cargo{display:flex;flex-wrap:wrap;justify-content:center;gap:4px}.cargo span{display:inline-block;border-radius:6px;background:#fff5dd;padding:3px 5px;font-size:9px;font-weight:900}.rail{position:absolute;bottom:0;width:100%;height:12px;border-top:4px solid #3e6b6c;background:repeating-linear-gradient(90deg,#836e56 0 15px,#edd3a9 15px 30px)}.falling-word{position:absolute;z-index:5;pointer-events:none;background:#ffefaa;border:2px solid #e7bc64;border-radius:9px;padding:7px 10px;color:#614523;font-size:12px;font-weight:900;white-space:nowrap}.train-feedback{min-height:34px;margin-top:13px;font-size:12px;line-height:1.5;color:#4d7480;font-weight:800}.finish-card{text-align:center;padding:52px 30px}.finish-symbol{display:grid;place-items:center;width:90px;height:90px;border-radius:50%;background:#ffe7aa;color:#ad7b28;font-size:49px;margin:0 auto 22px}.finish-card h2{margin:10px 0;font-size:35px}.finish-card p{max-width:550px;margin:0 auto;color:var(--muted);font-size:14px;line-height:1.65}.caught-list{display:flex;justify-content:center;flex-wrap:wrap;gap:7px;margin:22px 0}.caught-list span{background:#e8f4f2;color:var(--teal-dark);padding:8px 10px;border-radius:7px;font-size:11px;font-weight:900}.finish-card .activity-actions{justify-content:center}.plain-header{margin-bottom:26px}.two-column{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}.panel{padding:26px}.panel h2{font-size:24px}.panel h3{margin-top:30px}.review-item{border:1px solid #e4ece8;border-radius:13px;padding:16px;margin-top:10px}.review-item strong{display:block;font-size:13px;line-height:1.6}.review-item small{display:block;margin-top:7px;color:var(--muted)}.review-status{display:block;color:var(--teal);font-size:11px;font-weight:800;margin:9px 0}.review-item .button{margin-top:10px}.empty-state{border-radius:12px;background:#ecf6f3;padding:20px;color:#4e7c7d;font-size:13px}.stat-row{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid #e7eeeb;padding:13px 0;font-size:12px}.stat-row strong{font-size:15px}.bar{height:9px;background:#e5efec;border-radius:100px;overflow:hidden;margin:12px 0 20px}.bar span{display:block;height:100%;background:var(--teal)}.panel>.button.full{margin-top:25px}.teacher-columns{grid-template-columns:1.25fr .75fr}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:19px}.form-grid .wide{grid-column:1/-1}.form-actions{margin-top:17px}.form-message{font-size:12px;font-weight:800}.stacked-actions{display:grid;gap:10px;margin-top:18px}.file-button{cursor:pointer}.file-button input{display:none}.privacy-note{background:#fff5e1;border-radius:11px;padding:15px;color:#836b43;font-size:11px;line-height:1.6;margin-top:21px}label{font-size:11px;font-weight:900;color:#536773}input,select,textarea{display:block;width:100%;min-height:43px;border:2px solid #dfe8e6;border-radius:9px;background:white;color:var(--ink);padding:9px 11px;margin-top:6px;outline:none}textarea{resize:vertical}input:focus,select:focus,textarea:focus{border-color:var(--teal)}dialog{border:0;border-radius:18px;padding:28px;max-width:min(90vw,420px);box-shadow:0 27px 80px rgba(18,44,60,.25)}dialog::backdrop{background:rgba(18,42,50,.45)}dialog p{font-size:13px;color:var(--muted)}.dialog-actions{display:flex;gap:9px;justify-content:flex-end;margin-top:19px}footer{display:flex;justify-content:space-between;gap:12px;border-top:1px solid #e4e9e1;padding:23px clamp(20px,4vw,68px);font-size:11px;color:#899a9a}footer strong{color:var(--ink);font-size:13px}
@keyframes cloudDrift{from{transform:translateX(18px)}to{transform:translateX(-18px)}}@keyframes trainTravel{from{transform:translateX(-20px)}to{transform:translateX(36px)}}@keyframes cloudShake{0%,100%{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
.mini-train img{display:block;width:73px;height:auto}.engine img{display:block;width:102px;height:78px;object-fit:contain;filter:drop-shadow(0 5px 2px rgba(46,57,55,.18))}
.home-intro{padding:28px 32px;align-items:center}.home-intro h1{font-size:clamp(34px,3.5vw,48px)}.catalog-grid{grid-template-columns:repeat(4,minmax(0,1fr));align-items:start;gap:15px}.catalog-group{padding:18px 16px}.catalog-group h3{font-size:17px}.topic-row{grid-template-columns:12px minmax(0,1fr) auto;gap:6px;min-height:49px;line-height:1.4}.topic-row em{font-size:9px}.catalog-heading{margin-top:31px}
@media(max-width:1120px){.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:1120px){.tense-preview{grid-template-columns:repeat(4,minmax(0,1fr))}.tense-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:250px minmax(0,1fr)}.home-stats{gap:7px}.home-stats>div{padding:13px;min-width:75px}.topbar{gap:12px}.nav-link{padding:10px}}
@media(max-width:760px){.topbar{height:auto;min-height:76px;flex-wrap:wrap;padding:12px 18px;gap:6px}.brand{min-width:auto}.topnav{order:3;width:100%;justify-content:space-between;overflow-x:auto;margin:4px -5px -2px}.nav-link{font-size:11px;padding:10px 8px}.profile-pill{margin-left:auto}.view{padding:20px 16px 55px}.home-intro{display:block;padding:27px 24px}.home-intro h1{letter-spacing:-1.4px}.home-stats{margin-top:22px}.home-stats>div{flex:1}.home-section-title{align-items:start;flex-direction:column;margin-top:33px}.home-section-title h2{font-size:29px}.tense-preview{grid-template-columns:repeat(2,minmax(0,1fr))}.preview-tile{min-height:110px}.catalog-grid{grid-template-columns:1fr}.catalog-group{padding:17px}.tense-header{padding:27px 25px}.header-art{display:none}.tense-grid{grid-template-columns:1fr}.tense-card{min-height:230px}.lab-header{align-items:start;flex-direction:column}.lesson-layout{grid-template-columns:1fr}.concept-card{position:static}.concept-card .concept-line:nth-of-type(2){display:block}.activity-card{padding:21px}.sentence-box{padding:16px 14px}.two-column,.teacher-columns{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.form-grid .wide{grid-column:auto}.topic-row{grid-template-columns:15px minmax(0,1fr) auto}.topic-row em,.topic-row strong{display:none}footer span:last-child{display:none}}
@media(max-width:420px){.brand{font-size:15px}.brand strong{font-size:19px}.brand-mark{width:37px;height:37px}.profile-pill{max-width:130px}.home-stats strong{font-size:20px}.home-stats span{font-size:10px}.home-stats>div{min-width:0}.preview-tile strong{font-size:15px}.preview-tile small{font-size:9px}.topic-row small{font-size:9px}.stepper span{font-size:9px;padding:7px 2px}.inline-answer{width:122px;font-size:16px}.word-token{min-height:36px}.sentence-box{font-size:18px}.train-world{height:350px}.cloud-track{height:190px}.train-cloud{min-width:96px;flex-basis:96px;min-height:64px;font-size:10px}.carriage{min-width:160px}.engine{font-size:44px}.train-moving{left:2%}.level-control{width:100%;justify-content:space-between}}
@media(max-width:420px){.engine img{width:77px;height:59px}}
@media(max-width:760px){.topic-row strong,.topic-row em{display:block}.catalog-grid{grid-template-columns:1fr}.home-intro{padding:25px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

.topic-guide{margin-top:20px}.topic-guide-card{padding:clamp(20px,4vw,36px);border:1px solid #dce8e2;border-radius:20px;background:white;box-shadow:var(--shadow)}.topic-guide-card h2{margin:8px 0 20px;color:#1b3c4a;font-size:clamp(25px,4vw,36px)}.topic-guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.topic-guide-grid section{padding:16px;border:1px solid #e0eae5;border-radius:13px;background:#f8faf7}.topic-guide-grid small{color:#267b7c;font-size:10px;font-weight:1000;letter-spacing:.09em}.topic-guide-grid p{margin:8px 0 0;color:#34545e;line-height:1.65}.topic-guide-example{font-weight:800}.topic-guide-actions{display:flex;gap:10px;margin-top:18px}.pronoun-table-wrap{overflow-x:auto;margin-top:18px}.pronoun-guide-table{width:100%;min-width:720px;border-collapse:collapse}.pronoun-guide-table th,.pronoun-guide-table td{padding:10px;border:1px solid #dce8e2;text-align:left}.pronoun-guide-table thead{background:#eaf4ef;color:#215d5c}.pronoun-guide-table tbody tr:nth-child(even){background:#fafbf8}@media(max-width:640px){.topic-guide-grid{grid-template-columns:1fr}.topic-guide-actions{flex-wrap:wrap}}