:root{--navy:var(--appearance-text,#0f172a);--blue:var(--appearance-strong,#2563eb);--soft:var(--appearance-surface,#f8fafc);--line:var(--appearance-line,#dbe3ef);--text:var(--appearance-text,#0f172a);--muted:var(--appearance-muted,#64748b)}*{box-sizing:border-box}body{background:var(--appearance-soft,#f5f3ee);color:var(--text);margin:0;font-family:Inter,system-ui,Segoe UI,Arial,sans-serif}a{color:inherit;text-decoration:none}button,.btn,.tab,.tree-item{cursor:pointer}.header{background:var(--appearance-strong,var(--navy));color:#fff;justify-content:space-between;align-items:center;padding:22px 32px;display:flex}.header p{color:var(--appearance-muted,#cbd5e1);margin:4px 0 0}.btn{border:0;border-radius:12px;padding:12px 16px;font-weight:800}.btn.primary{background:var(--appearance-strong,#4f46e5);color:#fff}.btn.ghost{background:var(--appearance-soft,#e2e8f0);color:var(--appearance-text,#0f172a)}.layout{grid-template-columns:290px 1fr;gap:18px;padding:18px;display:grid}.panel{background:var(--appearance-surface,white);border:1px solid var(--line);border-radius:18px;padding:18px}.sidebar h3{margin-top:0}.library-search{margin-bottom:10px}.library-node{margin:3px 0}.library-node-toggle{width:100%;color:var(--text);font:inherit;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:6px;padding:8px;font-weight:800;display:flex}.library-node-toggle:hover{background:var(--soft)}.library-node-toggle span{width:14px;color:var(--muted);text-align:center}.library-node-children{border-left:2px solid var(--appearance-line,#e2e8f0);margin-left:10px;padding-left:8px}.sidebar .tree-item{padding:8px 10px}.tree-item{border-radius:10px;margin:4px 0;padding:10px 12px;display:block}.tree-item:hover,.tree-item.active{background:var(--appearance-soft,#dbeafe);color:var(--appearance-link,#1d4ed8)}.sub{border-left:2px solid var(--appearance-line,#e2e8f0);margin-left:18px;padding-left:12px}.dashboard{grid-template-columns:1.3fr .9fr;gap:16px;display:grid}.hero{background:var(--appearance-surface,#eff6ff);border-color:var(--appearance-line,#bfdbfe)}.concept-title{justify-content:space-between;align-items:start;gap:16px;display:flex}.mastery{background:var(--appearance-surface,#eff6ff);border:1px solid var(--appearance-line,#bfdbfe);border-radius:16px;min-width:145px;padding:14px}.bar{background:var(--appearance-soft,#e2e8f0);border-radius:999px;height:10px;overflow:hidden}.bar span{background:var(--blue);height:100%;display:block}.tabs{flex-wrap:wrap;gap:8px;margin:16px 0;display:flex}.tab{background:var(--appearance-soft,#e2e8f0);border:0;border-radius:10px;padding:10px 14px;font-weight:800;transition:all .15s}.tab:hover{background:var(--appearance-soft,#cbd5e1)}.tab.active{background:var(--appearance-strong,#0f172a);color:#fff}.concept-tabs{border-bottom:1px solid var(--line);flex-wrap:nowrap;align-items:center;gap:4px;height:48px;margin:8px 0 12px;overflow-x:auto}.concept-tabs .tab{white-space:nowrap;flex:none;justify-content:center;align-items:center;height:40px;padding:0 14px;display:inline-flex}.grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.card{border:1px solid var(--line);background:var(--appearance-surface,#fff);border-radius:16px;padding:16px}.muted{color:var(--muted)}input,textarea,select{border:1px solid var(--line);width:100%;font:inherit;border-radius:12px;padding:12px}textarea{min-height:110px}.form-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}.stack{gap:12px;display:grid}@media (max-width:900px){.layout,.dashboard,.grid{grid-template-columns:1fr}.header{display:block}.sidebar{order:2}}
:root[data-appearance=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-appearance=navy],:root[data-appearance=midnight]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--appearance-surface:#101e33;--appearance-soft:#192b43;--appearance-text:#edf2fa;--appearance-muted:#b5c3d8;--appearance-line:#556781;--appearance-strong:#254b7b;--appearance-link:#9cc7ff;--appearance-focus:#a7ceff;--appearance-danger:#ffadb7;--appearance-danger-fill:#8c283d;--appearance-success:#94dfb2;--appearance-success-fill:#195d41;--appearance-warning:#ffd494;--appearance-warning-fill:#71501b}:root[data-appearance=midnight]{--appearance-surface:#101114;--appearance-soft:#1c1e24;--appearance-text:#f3f4f7;--appearance-muted:#bfc4d0;--appearance-line:#626875;--appearance-strong:#233e66}:root[data-appearance=navy] body{background:#0a1425}:root[data-appearance=midnight] body{background:#08090b}:root[data-appearance=navy] :is(input,textarea,select),:root[data-appearance=midnight] :is(input,textarea,select){color:var(--appearance-text);background-color:var(--appearance-surface);accent-color:var(--appearance-link)}:root[data-appearance=navy] :focus-visible,:root[data-appearance=midnight] :focus-visible{outline-color:var(--appearance-focus)}