@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap');
:root{--green:#315b45;--ink:#263e32;--muted:#7a857c;--paper:#f7f8f2;--line:#e2e7db}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px 'Noto Sans SC',sans-serif;line-height:1.8}aside{position:fixed;width:230px;height:100vh;background:#edf1e6;padding:38px 25px;border-right:1px solid var(--line)}a{color:inherit;text-decoration:none}.brand{display:block;font-size:24px;font-weight:700;line-height:1.5;overflow-wrap:anywhere}.sub{font-size:12px;color:var(--muted);margin:7px 0 42px}nav{display:grid;gap:10px}button{font:inherit;cursor:pointer;border:0;border-radius:10px;padding:12px 18px;background:#e9eee3;color:var(--ink);text-align:left}nav button{background:transparent}nav button.active,button.primary{background:var(--green);color:#fff}button:hover{filter:brightness(.96)}button:focus-visible,a:focus-visible{outline:3px solid #b5b466;outline-offset:3px}.aside-note{position:absolute;bottom:42px;font-size:16px;color:#6b7b64}.aside-note span{display:block;font-size:32px;margin-top:15px}main{margin-left:230px;padding:0 5%;max-width:1550px}header{height:86px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}#app{min-height:75vh}h1{font-size:36px;line-height:1.4;margin:10px 0 14px;letter-spacing:-1px}h2{font-size:22px;margin:0 0 16px}h3{font-size:17px;margin:0 0 8px}p{margin:8px 0 16px}.muted{color:var(--muted)}.eyebrow{font-size:12px;color:#78845b;letter-spacing:2px}.hero{padding:42px 35px;background:#e9efdf;border-radius:20px;position:relative;margin-top:30px;overflow:hidden}.hero p{max-width:460px;color:#6a7967}.hero-art{position:absolute;right:45px;top:36px;width:210px;height:190px;border:1px solid #b9caa5;border-radius:50% 50% 10px 10px;background:#f7f8ec;display:grid;place-content:center;text-align:center;transform:rotate(6deg)}.hero-art b{font:52px monospace;color:var(--green)}.hero-art span{font-size:12px;letter-spacing:3px}.tag{font-size:11px;display:inline-block;border:1px solid #ccd6bf;padding:3px 10px;border-radius:30px;margin:0 6px 12px 0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:22px 0 32px}.stat,.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}.stat b{font-size:27px;margin-right:7px}.stat span{color:var(--muted);font-size:12px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin:26px 0 15px}.section-heading h2{margin:0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{position:relative}.card .num{font:12px monospace;color:#8d9a81;margin-bottom:20px}.card p{font-size:13px;color:var(--muted)}.card button{padding:7px 0;background:transparent;color:var(--green);font-size:13px}.progress{height:6px;background:#e9eee4;border-radius:8px;overflow:hidden}.progress i{display:block;height:100%;background:#799464}.tip{background:#f0ebda;border-radius:12px;padding:17px 23px;margin:24px 0;font-size:13px}.top-title{margin:35px 0 24px}.lesson{max-width:850px;margin:30px auto}.lesson .card{margin:18px 0}pre{background:#263e32;color:#edf4df;padding:23px;border-radius:12px;overflow:auto;line-height:1.8;font-size:14px;white-space:pre}code{font-family:ui-monospace,monospace}.options{display:grid;gap:9px;margin:18px 0}.options button{background:#fff;border:1px solid var(--line)}.options button.selected{border:2px solid var(--green);background:#eaf0e1}.feedback{padding:15px;border-radius:10px;background:#edf2e6;margin:15px 0}.wrong{background:#fcf0df}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}details{padding:13px;background:#f2f4ec;border-radius:9px;margin-top:15px}summary{cursor:pointer}footer{font-size:11px;color:#8b9488;padding:35px 0}.badge{font-size:11px;color:#66834e;background:#edf3e4;padding:3px 8px;border-radius:5px}.back{margin-top:24px}.examq{margin:20px 0}.examq label{display:block;padding:7px;cursor:pointer}.examq input{margin-right:10px}textarea{width:100%;min-height:125px;font:14px monospace;padding:15px;border:1px solid #ccd5c1;border-radius:10px;background:#fafbf7}.empty{text-align:center;padding:60px 20px}.small{font-size:12px}.walk{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.walk span{background:#edf1e4;padding:7px 15px;border-radius:6px}@media(max-width:1000px){.hero-art{right:22px;width:150px;height:165px}.hero p{max-width:65%}.grid{grid-template-columns:repeat(2,1fr)}main{padding:0 25px}aside{width:200px}main{margin-left:200px}}@media(max-width:700px){aside{position:static;width:auto;height:auto;padding:17px 20px}.brand{font-size:21px}.sub,.aside-note{display:none}nav{display:flex;gap:4px;margin-top:13px;overflow:auto}nav button{white-space:nowrap;font-size:12px;padding:8px 10px}main{margin:0;padding:0 18px}header{height:55px;font-size:10px}h1{font-size:27px}.hero{padding:25px;margin-top:20px}.hero-art{display:none}.hero p{max-width:100%}.stats{gap:7px}.stat{padding:14px 10px}.stat b{font-size:22px;display:block}.stat span{font-size:10px}.grid{grid-template-columns:1fr}.card{padding:20px}.top-title{margin-top:25px}}
body{background:#f7f4ec}aside{background:#e7eddb}.hud{display:flex;justify-content:space-between;gap:10px;background:#fff9e9;border:1px solid #e7dfc4;border-radius:13px;padding:14px 20px;margin-top:22px;font-weight:600;font-size:13px}.islands{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:25px}.island{display:flex;align-items:center;flex-direction:column;min-height:185px;justify-content:center;gap:7px;background:#fff;border:2px solid #a7bd89;box-shadow:0 6px 0 #cdd7bc;transition:transform .15s}.island:hover{transform:translateY(-3px)}.island strong{font-size:22px}.island span{font-size:12px;color:#76846c}.island .island-no{font-family:monospace;align-self:flex-start}.island em{font-style:normal;font-size:23px;letter-spacing:3px;color:#c99e40}.island.locked{background:#ecece4;border-color:#dedfd4;box-shadow:0 6px 0 #dedfd4;opacity:.75;cursor:default}.island.complete{background:#edf4df}.quest{max-width:760px;margin:25px auto}.quest-title{margin:25px 0}.quest-title>span{color:#899370;font-size:12px}.dialog{display:flex;gap:20px;background:#fff;border:1px solid #e4e6d6;padding:23px;border-radius:16px;margin:24px 0}.fox{font-size:45px}.options button{display:flex;gap:20px;box-shadow:0 3px 0 #e0e4d7;transition:transform .1s}.options button:active{transform:translateY(2px)}button:disabled{cursor:default;opacity:.65}.large{margin-top:24px}.victory{text-align:center;padding:60px 15px;max-width:800px;margin:auto;animation:appear .4s ease-out}.victory .actions{justify-content:center}.trophy{font-size:90px;line-height:1.5}.bigstars{font-size:42px;color:#c29b35;letter-spacing:8px}.hero-art{background:#fff5d8;border-color:#e0cf9c}.hero{background:#e8efdb}.hero-art b{font-size:82px}.hero-art span{letter-spacing:1px;font-size:10px}.feedback{animation:appear .2s ease-out}@keyframes appear{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@media(max-width:700px){.islands{grid-template-columns:repeat(2,1fr);gap:13px}.island{padding:12px;min-height:155px}.island strong{font-size:17px}.hud{font-size:11px;padding:12px 9px}.dialog{padding:17px;gap:12px}.fox{font-size:32px}.victory{padding:40px 10px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

.symbol-guide{background:#fffdf7;border:1px solid #e6dfc9;border-radius:15px;padding:23px;margin:22px 0}.symbol-row{border-top:1px solid #e9e6d9;padding-top:17px;margin-top:17px}.symbol-row h3{font-family:ui-monospace,monospace;font-size:16px;overflow-wrap:anywhere}.symbol-row p{line-height:2.1;margin-bottom:0}.symbol-guide h2{font-size:20px}

.bear-avatar{width:115px;height:105px;display:inline-block;vertical-align:middle}.hero-art b{display:flex;justify-content:center}.fox .bear-avatar{width:50px;height:46px}.tip .bear-avatar{width:30px;height:27px}.fox{flex-shrink:0}
.source-link{color:#366848;text-decoration:underline;text-underline-offset:3px}.test-table{width:100%;border-collapse:collapse;font-size:13px;margin:15px 0}.test-table th,.test-table td{text-align:left;padding:10px;border-bottom:1px solid #dfe5d4;overflow-wrap:anywhere}.rubric{display:block;padding:9px 0;font-size:14px}.rubric input{width:18px;height:18px;vertical-align:middle;accent-color:#315b45}#examInput{min-height:125px}#examFeedback details pre{white-space:pre;overflow:auto}#examFeedback{scroll-margin-top:30px}.card a{overflow-wrap:anywhere}
.real-filters{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:20px}.real-filters label{display:grid;gap:7px;font-size:13px;flex:1;min-width:140px}.real-filters select{font:inherit;padding:11px 12px;background:#f8faf3;border:1px solid #cbd6bd;border-radius:9px;color:#263e32}
.islands article.island{text-align:center}.island-actions{display:flex;gap:9px;flex-wrap:wrap;justify-content:center}.island-actions button{padding:5px 9px;font-size:12px;background:#e8efdc}.island.locked{opacity:.85}.island-actions button:disabled{opacity:.45}.learning-links{margin:17px 0;padding:18px;background:#edf2e5;border-radius:12px}.learning-links button{margin:5px;font-size:12px;padding:8px 12px}