:root{color-scheme:light;--ink:#243c33;--green:#2d6352;--muted:#6d7970;--line:#dedfd5;--paper:#f7f5ef;--soft:#e8eee5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:default;opacity:.55}button:focus-visible,a:focus-visible{outline:3px solid #c29c44;outline-offset:4px}header{max-width:1000px;margin:auto;padding:24px 32px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700}.logo{background:var(--green);color:white;border-radius:12px;width:36px;height:36px;text-align:center;font:700 28px/34px Georgia}.prototype,.eyebrow,.footnote{font-size:13px;color:var(--muted)}main{max-width:800px;margin:auto;padding:36px 32px 55px}.intro{display:flex;align-items:center;justify-content:space-between;gap:18px}.eyebrow{letter-spacing:2px;margin:0 0 8px;font-weight:600}h1{font-size:32px;letter-spacing:-1px;line-height:1.25;margin:0}h2{font-size:25px;line-height:1.35;margin:12px 0 8px}.muted{color:var(--muted)}.intro .muted{margin:12px 0 0}.stat{display:flex;flex-direction:column;align-items:center;min-width:70px}.stat strong{font-size:38px;font-weight:500;line-height:1.2}.stat span{font-size:13px;color:var(--muted)}nav{display:flex;gap:26px;border-bottom:1px solid var(--line);margin:32px 0 22px}.tab{background:none;border:0;color:var(--muted);padding:10px 0 14px;border-bottom:3px solid transparent}.tab.active{color:var(--green);border-color:var(--green);font-weight:700}.tab span{font-size:13px;background:var(--soft);padding:2px 6px;border-radius:5px}.plan{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:14px;margin-bottom:16px}.progress{width:130px;height:6px;background:#e2e5db;border-radius:10px;overflow:hidden}.progress i{display:block;height:100%;width:0;background:var(--green);transition:width .3s}.card{background:#fffefb;border:1px solid var(--line);border-radius:24px;padding:30px 32px;box-shadow:0 8px 25px #243c3305;min-height:375px}.card-top{display:flex;gap:12px;align-items:center;justify-content:space-between;font-size:14px}.scene{color:var(--muted)}.badge{background:#f1ead9;color:#7a6336;border-radius:7px;padding:3px 9px;font-size:13px}.steps{display:flex;gap:10px;margin:22px 0}.step{background:#f0f1ea;color:var(--muted);border-radius:7px;padding:4px 10px;font-size:14px}.step.current{background:var(--soft);color:var(--green);font-weight:700}.listen{display:flex;gap:10px;margin:20px 0}.primary{background:var(--green);color:#fff;border:1px solid var(--green);border-radius:12px;padding:12px 20px;font-weight:600;min-height:48px}.secondary{background:transparent;color:var(--green);border:1px solid var(--line);border-radius:12px;padding:10px 15px;min-height:46px}.choices{display:grid;gap:10px}.choice{padding:13px 16px;text-align:left;border:1px solid var(--line);background:transparent;border-radius:12px;min-height:50px;color:var(--ink)}.choice:hover{background:#f3f6ef}.choice.correct{border-color:var(--green);background:var(--soft)}.feedback{background:#f6edde;color:#775329;padding:12px 16px;border-radius:12px;margin:16px 0}.feedback.success{background:var(--soft);color:var(--green)}.english{font:500 29px/1.4 Georgia,serif;overflow-wrap:anywhere}.example{border-left:3px solid #c8d7c5;padding-left:14px;margin:20px 0}.example p{margin:5px 0}.tiny{font-size:14px;color:var(--muted)}label{display:block;margin:14px 0 7px}input,select{color:var(--ink);background:#fffefb;border:1px solid #bdc8bc;border-radius:11px;padding:12px 14px;max-width:100%;min-height:48px}input{width:100%}input:focus{outline:2px solid #9fb9a9;outline-offset:2px}.writing{margin:16px 0}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.word{padding:12px 15px;background:#f3f4ed;border-radius:10px;font-size:14px}.word strong{color:var(--green)}.error{color:#a24736;font-size:14px}.done{text-align:center;padding:28px 0}.done .seal{display:inline-grid;place-items:center;background:var(--soft);width:70px;height:70px;border-radius:50%;font-size:30px}.search-label{font-size:14px;color:var(--muted)}.library-item{background:#fffefb;border:1px solid var(--line);border-radius:15px;margin:12px 0;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:15px}.library-item strong{font-size:19px}.library-item p{margin:4px 0}.library-item button{flex-shrink:0}footer{max-width:1000px;margin:auto;border-top:1px solid var(--line);padding:20px 32px;color:var(--muted);font-size:13px;display:flex;justify-content:space-between}[hidden]{display:none!important}@media(max-width:600px){header{padding:18px 20px}main{padding:26px 18px 35px}h1{font-size:27px}.stat strong{font-size:30px}.card{padding:22px 20px;border-radius:20px}.intro{gap:10px}.intro .muted{font-size:14px}.english{font-size:26px}.progress{width:85px}.plan{font-size:13px}.library-item{padding:14px}.library-item strong{font-size:17px}footer{padding:18px 20px}.prototype{font-size:12px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

.accent-picker{border:0;padding:0;display:flex;gap:8px;margin:24px 0 0;align-items:center}.accent-picker legend{float:left;margin-right:16px;line-height:44px;color:var(--muted);font-size:14px}.accent-picker label{display:flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:10px;margin:0;padding:8px 14px;cursor:pointer;font-size:15px}.accent-picker label:has(input:checked){background:var(--soft);border-color:var(--green);color:var(--green)}.accent-picker input{width:16px;min-height:0;height:16px;margin:0;padding:0;accent-color:var(--green)}.accent-picker span{font-size:12px;color:var(--muted)}

.brand{gap:12px}.yl-logo{width:48px;height:48px;flex-shrink:0;filter:drop-shadow(0 3px 3px #243c3310)}.brand-name{display:flex;align-items:baseline;gap:6px;white-space:nowrap}.brand-name strong{font-size:27px;line-height:1;letter-spacing:-1px;font-weight:800}.brand-name span{font-size:19px;letter-spacing:2px;font-weight:600}@media(max-width:600px){.yl-logo{width:43px;height:43px}.brand-name strong{font-size:25px}.brand-name span{font-size:18px}}

.yl-logo{width:133px;height:56px}@media(max-width:600px){.yl-logo{width:119px;height:50px}}
/* Playful brand motion */
.brand{transform-origin:24px 30px}
.yl-logo{overflow:visible;animation:yl-hello 5.5s ease-in-out infinite;transform-origin:30% 80%}
.yl-logo circle{transform-box:fill-box;transform-origin:center;animation:yl-spark 2.8s ease-in-out infinite}
.brand:active .yl-logo{animation:yl-wiggle .45s ease-in-out}
.brand:hover .yl-logo{animation:yl-wiggle .6s ease-in-out}
@keyframes yl-hello{0%,72%,100%{transform:translateY(0) rotate(0)}78%{transform:translateY(-4px) rotate(-3deg)}84%{transform:translateY(0) rotate(2deg)}90%{transform:translateY(-2px) rotate(-1deg)}}
@keyframes yl-spark{0%,65%,100%{opacity:1;transform:scale(1)}75%{opacity:.65;transform:scale(.7)}85%{opacity:1;transform:scale(1.25)}}
@keyframes yl-wiggle{0%,100%{transform:rotate(0)}25%{transform:rotate(-5deg) translateY(-3px)}55%{transform:rotate(4deg) translateY(-2px)}80%{transform:rotate(-2deg)}}
@media(prefers-reduced-motion:reduce){.yl-logo,.yl-logo circle,.brand:hover .yl-logo,.brand:active .yl-logo{animation:none}}
.brand.is-bouncing .yl-logo{animation:yl-wiggle .6s ease-in-out}
@media(prefers-reduced-motion:reduce){.brand.is-bouncing .yl-logo{animation:none}}
.daily-entry{width:100%;display:flex;align-items:center;justify-content:space-between;text-align:left;background:var(--green);color:#fff9ec;border:0;border-radius:16px;padding:18px 22px;gap:15px}.daily-entry strong{font-size:18px;display:block}.daily-entry span span{font-size:14px;display:block;margin-top:4px;opacity:.8}.daily-entry>span:last-child{font-size:25px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:24px}.section-heading h2{font-size:23px;margin:0}.category-intro{margin:7px 0 18px;font-size:15px}.category-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.category-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;border:1px solid var(--line);border-radius:18px;background:#fffefb;color:var(--ink);padding:20px;min-width:0;transition:transform .18s,border-color .18s}.category-card:hover:not(:disabled){transform:translateY(-3px);border-color:#8eaa95}.category-icon{font-size:25px;background:#eef2e8;border-radius:12px;width:46px;height:46px;display:grid;place-items:center;margin-bottom:12px}.category-card strong{font-size:18px}.category-desc{font-size:14px;color:var(--muted);margin-top:3px}.category-preview{font-family:Georgia,serif;font-size:17px;margin:12px 0 16px;overflow-wrap:anywhere}.category-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;border-top:1px solid var(--line);padding-top:12px;margin-top:auto;font-size:13px;color:var(--green)}.category-card:disabled{opacity:.6}.back-scenes{background:none;border:0;padding:0 0 16px;color:var(--green);font-size:14px}#category-filter{width:100%}nav{gap:22px}@media(max-width:600px){nav{gap:18px}.tab{font-size:14px}.section-heading{align-items:flex-start;flex-direction:column;gap:3px}.category-grid{gap:10px}.category-card{padding:15px 13px}.category-card strong{font-size:16px}.category-desc{font-size:13px}.category-preview{font-size:16px}.category-bottom{flex-direction:column;align-items:flex-start;gap:4px}.daily-entry{padding:16px 18px}}@media(max-width:350px){.category-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){.category-card{transition:none}}