:root{--bg:#080a14;--sidebar:#0c0f1e;--card:#111428;--card2:#161a30;--border:rgba(99,102,241,.1);--border2:rgba(99,102,241,.2);--t1:#e2e8f0;--t2:#94a3b8;--t3:#4b5675;--accent:#06d6a0;--adim:rgba(6,214,160,.12);--amber:#f59e0b;--adim2:rgba(245,158,11,.12);--violet:#8b5cf6;--vdim:rgba(139,92,246,.12);--ok:#22c55e;--okd:rgba(34,197,94,.12);--err:#ef4444;--errd:rgba(239,68,68,.12);--warn:#f59e0b;--warnd:rgba(245,158,11,.12);--fui:"Plus Jakarta Sans",sans-serif;--fbrand:"Syne",sans-serif;--fmono:"JetBrains 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var(--border);border-radius:var(--rl);padding:16px;cursor:pointer;transition:all .2s}.edu-card:hover{border-color:var(--accent);transform:translateY(-1px)}.edu-diff{font-size:10px;font-weight:700;letter-spacing:.5px;padding:2px 8px;border-radius:20px;text-transform:uppercase}.diff-basic{background:var(--okd);color:var(--ok)}.diff-inter{background:var(--adim2);color:var(--amber)}.diff-adv{background:var(--errd);color:var(--err)}.pb-rule{display:flex;align-items:flex-start;gap:10px;padding:10px;background:var(--card2);border-radius:var(--r);margin-bottom:8px}.pb-rule-num{width:22px;height:22px;background:var(--adim);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:var(--accent);flex-shrink:0;margin-top:1px}.pb-rule-text{font-size:13px;color:var(--t2);line-height:1.5;flex:1 1}.notebook-editor{background:var(--card);border:1px solid 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