@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap');

:root{--ink:#193c59;--muted:#6f8ba1;--aqua:#c9f5f4;--blue:#6ccbd8;--deep:#278da9;--pink:#ffe2f0;--white:#fff;--line:#d9f0f2;--shadow:0 12px 35px #3989a018}
*{box-sizing:border-box}
body{margin:0;font-family:Nunito,Arial,sans-serif;color:var(--ink);background:linear-gradient(135deg,#efffff,#f4f4ff 58%,#fff0f8);min-height:100vh}
button{font:inherit;cursor:pointer}
button:focus-visible{outline:3px solid #e49ad0;outline-offset:3px}
.app{min-height:100vh;display:grid;grid-template-columns:245px minmax(0,1fr)}
.sidebar{background:#fffdfd;border-right:1px solid var(--line);padding:25px 15px;display:flex;flex-direction:column;gap:9px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:21px;padding:0 10px 28px}
.brand-icon{display:grid;place-items:center;width:43px;height:43px;border-radius:15px;background:linear-gradient(135deg,#70d8e3,#9a9cff);color:white;font-size:30px;box-shadow:0 5px 16px #7acfd666}
.brand small{display:block;font-size:9px;letter-spacing:1.5px;color:var(--deep);margin-top:3px}
.nav{border:0;background:transparent;color:#6d8499;text-align:left;padding:13px 15px;border-radius:13px;font-weight:800;transition:.2s}
.nav:hover,.nav.active{background:#def8f8;color:#167d9c}
.sidebar-note{margin-top:auto;background:linear-gradient(140deg,#e2fbfa,#fce8f5);border-radius:18px;padding:18px;color:#56798c;font-size:13px}
.sidebar-note p{margin:7px 0 0}.tiny-star{color:#319fb8;font-size:24px}
.main{padding:27px clamp(18px,4vw,55px);min-width:0}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:27px}
h1,h2,h3,p{margin-top:0}h1{font-size:clamp(24px,3vw,34px);margin-bottom:0;font-weight:900}h2{font-size:27px;margin-bottom:9px;font-weight:900}p{line-height:1.7}
.eyebrow{font-size:10px;font-weight:900;letter-spacing:2px;color:#359db4;display:block;margin-bottom:9px}
.points{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px 17px;box-shadow:var(--shadow);white-space:nowrap}
.points>span{font-size:25px;color:#45b8ca}.points strong{display:block;font-size:20px}.points small{font-size:9px;letter-spacing:1px;color:var(--muted)}
.view{display:none;animation:appear .3s ease}.view.active{display:block}
@keyframes appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.hero{min-height:300px;display:flex;align-items:center;justify-content:space-between;gap:20px;overflow:hidden;padding:clamp(25px,4vw,48px);border-radius:28px;background:linear-gradient(115deg,#c8f7f2,#e4efff 58%,#f9e2f5);box-shadow:var(--shadow);position:relative}
.hero-copy{max-width:460px;position:relative;z-index:2}.hero h2{font-size:clamp(31px,4vw,47px);line-height:1.1;margin:12px 0}.hero p{max-width:390px;color:#587a91}
.primary{border:0;border-radius:13px;background:linear-gradient(100deg,#39b5c9,#608ce4);color:white;font-weight:900;padding:13px 19px;box-shadow:0 7px 16px #3eabc333;transition:transform .2s,filter .2s}
.primary:hover{transform:translateY(-2px);filter:brightness(1.04)}.primary:disabled{opacity:.45;cursor:not-allowed;transform:none}
.hero-art{width:220px;height:220px;flex-shrink:0;position:relative;display:grid;place-items:center}
.orbit{position:absolute;width:190px;height:190px;border:1px solid #fff9;border-radius:50%;transform:rotate(-28deg) scaleY(.45)}
.orbit-two{transform:rotate(42deg) scaleY(.6);width:230px}
.star-creature{height:112px;width:112px;position:relative;clip-path:polygon(50% 0%,63% 28%,95% 18%,79% 48%,100% 70%,68% 74%,55% 100%,39% 75%,7% 85%,22% 54%,0 33%,34% 31%);background:linear-gradient(145deg,#fff,#8de5ef 65%,#92a9f7);filter:drop-shadow(0 9px 8px #4d9ab955);animation:float 3s ease-in-out infinite}
.eye{position:absolute;top:43px;left:37px;width:7px;height:11px;background:#325d82;border-radius:50%}.eye:nth-child(2){left:66px}
.smile{position:absolute;top:60px;left:48px;width:18px;height:9px;border-bottom:2px solid #325d82;border-radius:50%}
.spark{position:absolute;color:white;font-style:normal;font-size:27px;animation:twinkle 2s infinite alternate}.s1{top:18px;left:15px}.s2{right:0;top:62px}.s3{bottom:10px;left:34px}
@keyframes float{50%{transform:translateY(-11px) rotate(4deg)}}
@keyframes twinkle{to{opacity:.35;transform:scale(.7) rotate(20deg)}}
.section-heading{margin:32px 0 18px}.section-heading p{color:var(--muted);margin:0}
.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}
.feature{border:1px solid var(--line);border-radius:19px;background:#ffffffd9;text-align:left;padding:21px;display:flex;align-items:flex-start;flex-direction:column;gap:9px;box-shadow:var(--shadow);transition:.2s;color:var(--ink)}
.feature:hover{transform:translateY(-4px);border-color:#8cdae0}.feature strong{font-size:16px}.feature small{color:var(--muted);line-height:1.5}
.feature-icon{width:45px;height:45px;display:grid;place-items:center;border-radius:14px;background:#ddf9f6;color:#238ea7;font-size:25px}.science-icon{background:#f0e8ff;color:#8973cb}.pet-icon{background:var(--pink);color:#d46da6}
.notice{margin-top:22px;padding:18px 21px;display:flex;gap:14px;background:#ffffffb8;border:1px solid var(--line);border-radius:17px}
.notice>span{font-size:25px;color:#38b4c6}.notice strong{display:block}.notice p{margin:4px 0 0;color:var(--muted);font-size:13px}
.book-grid,.shop-grid,.collection-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}
.book-card,.shop-card,.collection-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:15px;box-shadow:var(--shadow);min-width:0}
.book-cover{height:145px;border-radius:15px;display:grid;place-items:center;font-size:52px;color:white;margin-bottom:15px;position:relative;overflow:hidden}
.book-cover:before,.reading-cover:before{content:"";position:absolute;width:140px;height:140px;border:1px solid #ffffff70;border-radius:50%;top:-48px;right:-30px}
.cover-a{background:linear-gradient(145deg,#71d9d6,#6d91e5)}.cover-b{background:linear-gradient(145deg,#f6b4d7,#a69cf5)}.cover-c{background:linear-gradient(145deg,#80d6ac,#3c9eb8)}.cover-d{background:linear-gradient(145deg,#f5c77b,#ef9eae)}.cover-e{background:linear-gradient(145deg,#a8b9ff,#87e2e1)}.cover-f{background:linear-gradient(145deg,#bba0ed,#f2a8d7)}
.book-card h3,.shop-card h3,.collection-card h3{margin:0 0 7px;font-size:17px}.book-card p,.shop-card p,.collection-card p{font-size:13px;color:var(--muted);line-height:1.55;min-height:40px}
.book-card .primary,.shop-card .primary{width:100%;margin-top:5px}
.tag{display:inline-block;background:#e6f9f8;color:#26879c;border-radius:20px;padding:5px 9px;font-size:10px;font-weight:900;margin-bottom:10px}
.back-button{border:0;background:transparent;color:#328ca4;font-weight:900;padding:7px 0 17px}
.reading-card,.quiz-card{max-width:850px;margin:0 auto;background:white;border:1px solid var(--line);border-radius:24px;padding:clamp(20px,4vw,40px);box-shadow:var(--shadow)}
.reading-cover{height:130px;border-radius:17px;margin-bottom:23px;background:linear-gradient(120deg,#b9f1ec,#d8dcff,#f9d8ed);display:grid;place-items:center;color:#fff;font-size:60px;position:relative;overflow:hidden}
#book-title{font-size:32px}.book-byline{color:var(--muted);font-size:13px}
.story-text{font-size:17px;line-height:1.95;color:#39566d;white-space:normal}
.story-text p{margin:20px 0}.reading-footer{border-top:1px solid var(--line);padding-top:20px;margin-top:28px;display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap}
#reading-progress{font-size:12px;color:var(--muted)}
.quiz-card{max-width:650px;margin:20px auto}.quiz-card h2{line-height:1.4;margin:15px 0 25px}
.answer-options{display:grid;gap:12px}.answer-option{padding:14px 16px;border:1px solid var(--line);background:#f8fdfd;border-radius:13px;text-align:left;color:var(--ink);font-weight:800}
.answer-option:hover{border-color:var(--deep)}.answer-option.selected{border:2px solid #46b8c8;background:#e7fbfa}
#answer-feedback{margin:18px 0;font-weight:800;min-height:24px}#answer-feedback.good{color:#208a69}#answer-feedback.try{color:#bd6c8e}
.quiz-card .primary{width:100%}
.pet-garden{min-height:380px;border-radius:25px;position:relative;overflow:hidden;background:linear-gradient(#d9f8fb,#e9e7ff 75%,#fbe6f4);display:flex;align-items:flex-end;justify-content:center;padding:30px}
.flying-pet{position:absolute;animation:fly 5s ease-in-out infinite}
@keyframes fly{0%,100%{transform:translate(0,0) rotate(-4deg)}50%{transform:translate(18px,-25px) rotate(7deg)}}
.butterfly{left:16%;top:22%;display:flex;align-items:center}.wing{display:block;width:36px;height:45px;background:linear-gradient(140deg,#fff,#70d9dc);border-radius:90% 10% 90% 10%;border:2px solid #ffffffbb}.left-wing{transform:rotate(-22deg)}.right-wing{transform:scaleX(-1) rotate(-22deg)}.pet-body{height:34px;width:8px;border-radius:10px;background:#4389a8}
.cloud-pet{right:18%;top:17%;height:75px;width:90px;background:linear-gradient(140deg,#fff,#c5f1f4);border-radius:50%;box-shadow:0 8px 18px #7aa6c333;display:grid;place-items:center;color:#477d98;font-weight:900}.pet-face{margin-top:14px}
.moon-pet{left:42%;top:12%;font-size:66px;color:#e9b9e3;text-shadow:0 4px 12px #d7a7df66}
.garden-message{position:relative;text-align:center;background:#ffffffd9;padding:23px;border-radius:19px;max-width:450px;width:100%;box-shadow:var(--shadow)}
.garden-message p{font-size:13px;color:var(--muted)}
.shop-card{text-align:center}.shop-art{height:120px;display:grid;place-items:center;font-size:52px;border-radius:15px;background:linear-gradient(140deg,#e0fbf8,#f4e6ff);margin-bottom:14px;color:#65b8ce}
.shop-art .gem{width:55px;height:65px;background:linear-gradient(135deg,#fff,#7de3e4,#a5a4ff);clip-path:polygon(25% 0,75% 0,100% 35%,50% 100%,0 35%);filter:drop-shadow(0 5px 6px #74aacc55)}
.shop-price{font-weight:900;color:#238ca5;margin:10px 0}.collection-card{text-align:center}.collection-card .shop-art{margin-bottom:10px}
.empty-state{grid-column:1/-1;text-align:center;padding:40px 20px;color:var(--muted);background:#ffffffa8;border:1px dashed #b8e5e8;border-radius:18px}
#toast{position:fixed;right:24px;bottom:24px;background:#204e68;color:white;border-radius:13px;padding:13px 19px;box-shadow:var(--shadow);opacity:0;transform:translateY(10px);pointer-events:none;transition:.25s;z-index:20}
#toast.show{opacity:1;transform:translateY(0)}
@media(max-width:1000px){.app{grid-template-columns:200px minmax(0,1fr)}.book-grid,.shop-grid,.collection-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{width:160px}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){.app{display:block}.sidebar{padding:12px;display:flex;flex-direction:row;flex-wrap:wrap;border-right:0;border-bottom:1px solid var(--line)}.brand{width:100%;padding:0 5px 8px}.nav{font-size:12px;padding:10px}.sidebar-note{display:none}.main{padding:20px 14px}.hero{padding:24px}.hero-art{width:95px;height:125px;transform:scale(.7);margin-right:-15px}.hero h2{font-size:29px}.book-grid,.shop-grid,.collection-grid,.feature-grid{grid-template-columns:1fr 1fr}.topbar{align-items:flex-start}.points{padding:8px 10px}.points small{font-size:8px}.reading-footer{align-items:stretch}.reading-footer .primary{width:100%}}
@media(max-width:390px){.book-grid,.shop-grid,.collection-grid,.feature-grid{grid-template-columns:1fr}.hero-art{display:none}}