@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@500;600;700;800;900;1000&display=swap');
[hidden]{display:none!important}
.home-link{display:flex;align-items:center;gap:7px;border:1px solid #d9e3df;background:#ffffffc9;color:var(--ink);text-decoration:none;border-radius:13px;padding:10px 13px;font-weight:900}.home-link span{font-size:1.1rem}
:root{font-family:Nunito,'Segoe UI',sans-serif;color:#173f55;background:#f5f2e9;--ink:#173f55;--teal:#178779;--teal-soft:#dcefe9;--coral:#ef7657;--yellow:#f4c95d;--paper:#fffdf7;--line:#dce5df;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 8% 12%,#ffe9a3 0 7%,transparent 7.2%),radial-gradient(circle at 95% 88%,#c8ebe4 0 12%,transparent 12.2%),linear-gradient(145deg,#fffaf0,#eef7f3)}button,select{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #0d7892;outline-offset:3px}.app-shell{width:min(1180px,100%);min-height:100vh;margin:auto;padding:22px 30px 100px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:800}.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:13px;background:var(--ink);color:white;font-weight:1000}.top-actions{display:flex;align-items:center;gap:10px}.icon-button{display:flex;align-items:center;gap:7px;border:1px solid #d9e3df;background:#ffffffc9;color:var(--ink);border-radius:13px;padding:10px 13px;font-weight:900}.icon-button svg,.method-grid svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.progress-pill{padding:10px 14px;border-radius:13px;background:var(--ink);color:white;font-weight:900;font-size:.82rem}.mission-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin:44px 0 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minmax(260px,.65fr);gap:16px}.classroom-scene,.notebook,.choice-panel,.character-card,.source-grid button,.method-grid button,.experiment-card,.data-table,.conclusion-card,.result-screen{border:1px solid #dde5df;background:#fffdf8;box-shadow:0 16px 45px #264d4310}.classroom-scene{position:relative;min-height:450px;overflow:hidden;border-radius:26px;background:linear-gradient(#e8f4ef 0 68%,#d2b899 68%)}.window{position:absolute;left:7%;top:9%;display:grid;grid-template-columns:1fr 1fr;width:180px;height:150px;border:12px solid white;border-radius:10px;box-shadow:0 8px 22px #173f5515}.window span{background:#bce1ef;border:2px solid white}.sunbeam{position:absolute;left:24%;top:0;width:210px;height:310px;background:linear-gradient(110deg,#fff7ba88,transparent);transform:skew(-12deg)}.desk{position:absolute;left:21%;right:16%;bottom:0;height:105px;background:#bd8a63;border-top:15px solid #936647}.plant-wrap{position:absolute;left:45%;bottom:70px;width:190px;transform:translateX(-50%)}.plant-svg{display:block;width:100%}.watering-can{position:absolute;right:12%;bottom:80px;width:120px}.watering-can svg{width:100%;fill:#6ea2ad}.hotspot{position:absolute;z-index:3;display:flex;align-items:center;gap:7px;border:0;background:#173f55e8;color:white;border-radius:999px;padding:7px 11px 7px 7px;box-shadow:0 7px 18px #173f5530;font-size:.72rem;font-weight:900;transition:.2s transform,.2s opacity}.hotspot:hover{transform:translateY(-3px)}.hotspot span{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--yellow);color:var(--ink);font-size:1rem}.hotspot.found{opacity:.45;pointer-events:none}.hot-window{left:12%;top:43%}.hot-leaf{left:55%;top:24%}.hot-soil{left:52%;bottom:32%}.hot-can{right:8%;bottom:23%}.notebook{border-radius:26px;padding:24px;background:repeating-linear-gradient(#fffdf7 0 32px,#d9e8e2 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p{max-width:290px;color:#647b80;line-height:1.55;font-weight:700}.robot{position:relative;display:grid;place-items:center;width:150px;height:125px;margin:35px 0 24px;border-radius:35px;background:linear-gradient(145deg,#66b8a5,#217b73);border:8px solid white;box-shadow:0 18px 30px #1b6f6725}.robot:before,.robot:after{content:'';position:absolute;top:45px;width:18px;height:45px;border-radius:12px;background:#ef7657}.robot:before{left:-22px}.robot:after{right:-22px}.antenna{position:absolute;left:70px;top:-42px;width:8px;height:38px;background:#173f55}.antenna:after{content:'';position:absolute;left:-7px;top:-12px;width:22px;height:22px;border-radius:50%;background:#f4c95d}.face{padding:13px 20px;border-radius:18px;background:#fff;color:#173f55;font-size:1.6rem;font-weight:1000}.choice-panel{display:grid;gap:12px;border-radius:26px;padding:26px}.choice-panel button{display:flex;align-items:center;gap:14px;width:100%;min-height:82px;text-align:left;border:2px solid 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arrive{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}@media(max-width:850px){.source-grid{grid-template-columns:repeat(2,1fr)}.method-grid{grid-template-columns:1fr}.method-grid button{min-height:170px}.scene-card,.choice-layout,.experiment-card,.conclusion-card{grid-template-columns:1fr}.badge-row{display:none}.plant-lab{min-height:280px}}@media(max-width:560px){.app-shell{padding:14px 12px 100px}.brand>span:last-child{display:none}.mission-head{margin-top:30px}.mission-head h1{font-size:2.35rem}.scene-card{gap:10px}.classroom-scene{min-height:390px}.window{width:130px;height:110px}.plant-wrap{width:160px;left:48%}.watering-can{width:85px}.hotspot b{display:none}.hot-leaf{left:58%}.hot-soil{left:57%}.source-grid{grid-template-columns:1fr 1fr}.source-grid button{min-height:165px;padding:16px 10px}.experiment-card{padding:14px}.water-control{grid-template-columns:1fr}.plant-lab{gap:8px;padding:12px}.lab-leaves{transform:scale(.82);margin-left:auto;margin-right:auto}.data-table{align-items:flex-start;flex-direction:column}.data-table strong{border-left:0;padding-left:0}.action-bar{bottom:7px}.icon-button span{display:none}}