:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#19352f;background:#f5f7f3;font-synthesis:none;--green:#176a53;--muted:#687a73;--line:#dde5dd}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;min-height:42px;border:1px solid #cbd8cd;background:white;border-radius:9px;padding:9px 15px;color:inherit}button:hover{background:#edf5ee}button:disabled{opacity:.5;cursor:not-allowed}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}.primary{background:var(--green);color:#fff;border-color:var(--green)}.primary:hover{background:#105440}.site-header{display:flex;align-items:center;justify-content:space-between;padding:18px max(24px,calc((100vw - 1440px)/2));gap:25px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:750;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:#e5f1e7;color:var(--green);font-size:23px}.brand small{display:block;font-size:11px;letter-spacing:.8px;color:var(--muted);margin-top:5px;font-weight:400}nav{display:flex;align-items:center;gap:23px;font-size:14px}#account-link{color:var(--green);font-weight:650}#app{max-width:1440px;margin:auto;padding:34px 28px}.hero{display:flex;align-items:end;justify-content:space-between;gap:25px;margin:10px 0 25px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--green);font-weight:700}.hero h1{font-size:35px;margin:10px 0 12px;letter-spacing:-1px}.muted,.hero p{color:var(--muted);font-size:14px;line-height:1.7}.hero p{margin:0}.tools,.filters,.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.tools{margin:20px 0}.tools input{min-width:240px;flex:1}.tools select{max-width:200px}input,select,textarea{padding:11px 13px;border:1px solid #ccd8cf;border-radius:9px;background:#fff;color:inherit}textarea{width:100%;min-height:220px;resize:vertical;font:13px/1.7 Consolas,monospace}.count{color:var(--muted);font-size:13px}.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:19px;margin-top:20px}.card{min-width:0;overflow:hidden;background:white;border:1px solid var(--line);border-radius:14px;transition:transform .15s,box-shadow .15s}.card:hover{transform:translateY(-2px);box-shadow:0 7px 20px #1a3c2710}.card-image{display:block;width:100%;aspect-ratio:16/10;object-fit:cover;object-position:center;background:#f0f4ef;border-bottom:1px solid #e7eee7}.card-body{padding:16px}.card-category{font-size:11px;letter-spacing:.5px;color:var(--green)}.card h2{font-size:16px;line-height:1.5;margin:8px 0 16px;min-height:48px}.card-actions{display:flex;gap:7px;flex-wrap:wrap}.card-actions button,.card-actions a{font-size:12px;padding:7px 10px;min-height:34px}.card-actions a{border:1px solid #d3e2d5;border-radius:7px;background:#eaf4ec}.card-actions .selected{background:#f4eacb;color:#785c1a;border-color:#e5d6a1}.empty{padding:65px 20px;text-align:center;background:#fff;border:1px dashed #ccd8cf;border-radius:14px;color:var(--muted)}.lesson{padding:22px;background:white;border:1px solid var(--line);border-radius:13px;margin:16px 0}.lesson h2{margin:0;font-size:20px}.lesson-head{display:flex;align-items:center;justify-content:space-between;gap:15px}.lesson ol{padding-left:24px}.lesson li{padding:10px 0;border-bottom:1px solid #edf0ea}.lesson li .actions{display:inline-flex;margin-left:12px}.lesson li button{font-size:12px;min-height:30px;padding:4px 9px}.unknown{color:#9b6a29}.experiment-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}.experiment-tools strong{margin-right:auto}.experiment-frame{display:block;width:100%;height:calc(100dvh - 182px);min-height:430px;border:1px solid var(--line);border-radius:12px;background:white}.experiment-stopped{padding:45px;background:#fff6e5;border:1px solid #ead0a5;border-radius:12px}.experiment-stopped h2{font-size:22px}.full-player{position:fixed;inset:0;z-index:5;background:#f5f7f3;padding:12px!important;max-width:none!important}.full-player .experiment-frame{height:calc(100dvh - 70px)}#notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:20;background:#183f31;color:white;border-radius:10px;padding:12px 20px;max-width:min(90vw,760px);box-shadow:0 8px 25px #1233}#notice:empty{display:none}dialog{max-width:450px;width:90%;border:1px solid var(--line);border-radius:16px;padding:26px;color:inherit}dialog::backdrop{background:#14362855}dialog h2{margin-top:0}dialog label{display:grid;gap:10px;margin-bottom:24px}dialog .actions{justify-content:flex-end}.editor-note{padding:18px;background:#eaf2e8;border-radius:10px;line-height:1.7}.title-editor{display:grid;grid-template-columns:72px 1fr 90px;align-items:center;gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}.title-editor input{width:100%}.title-editor label{font-size:13px}#recovery-download[hidden]{display:none}.loading{color:var(--muted);padding:60px 0;text-align:center}
@media(max-width:1100px){.grid{grid-template-columns:repeat(3,minmax(0,1fr))}.site-header{padding:16px 22px}nav{gap:15px}.brand small{display:none}}
@media(max-width:800px){.site-header{align-items:start;flex-direction:column;gap:16px}nav{width:100%;overflow:auto;white-space:nowrap;padding-bottom:4px;gap:20px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}#app{padding:20px 16px}.hero{align-items:start;flex-direction:column}.hero h1{font-size:28px}.experiment-frame{height:calc(100dvh - 230px)}.lesson-head{align-items:start;flex-direction:column}.title-editor{grid-template-columns:50px 1fr 70px}}
@media(max-width:470px){.grid{grid-template-columns:1fr}.card-image{aspect-ratio:16/8}.card h2{min-height:0}.tools input{min-width:180px}.brand{font-size:16px}.hero h1{font-size:26px}}
.actions>a.primary{display:inline-flex;align-items:center;padding:10px 16px;border-radius:9px;min-height:42px}