.cr-wrap{max-width:1040px;margin:0 auto;padding:36px 20px 64px}.cr-hero h1{font-size:30px;font-weight:800;letter-spacing:-.5px;margin-bottom:6px}.cr-hero p{font-size:14px;color:var(--text-muted);font-family:var(--font-mono);font-weight:500;margin-bottom:28px}.cr-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}.cr-tab{font-family:var(--font-mono);font-size:12px;font-weight:800;padding:8px 18px;border-radius:99px;border:1.5px solid var(--border2);background:var(--surface2);color:var(--text-muted);cursor:pointer;transition:all .15s}.cr-tab.active,.cr-tab:hover{background:#ffe4ef;border-color:#f9a8d4;color:#9d174d}.cr-panel{display:none}.cr-panel.active{display:block}.rt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}.rt-card{background:var(--surface);border:1.5px solid var(--border2);border-radius:16px;padding:22px 20px;box-shadow:var(--shadow-sm);transition:box-shadow .15s,transform .15s;cursor:pointer}.rt-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.rt-card.selected{border-color:#f9a8d4;background:#fff1f5}.rt-icon{font-size:32px;margin-bottom:10px}.rt-name{font-size:16px;font-weight:800;margin-bottom:4px}.rt-formula{font-family:var(--font-mono);font-size:13px;font-weight:800;color:#9d174d;background:#ffe4ef;padding:5px 10px;border-radius:8px;display:inline-block;margin:8px 0}.rt-desc{font-size:13px;color:var(--text-muted);font-weight:600;line-height:1.65;margin-bottom:10px}.rt-example{font-size:12px;font-family:var(--font-mono);font-weight:700;color:var(--text);background:var(--surface2);border-radius:8px;padding:8px 12px;line-height:1.7}.rt-example .highlight{color:#9d174d}.fr-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}.fr-card{background:var(--surface);border:1.5px solid var(--border2);border-radius:16px;padding:22px;box-shadow:var(--shadow-sm)}.fr-name{font-size:16px;font-weight:800;margin-bottom:4px}.fr-type-badge{font-size:10px;font-weight:800;font-family:var(--font-mono);padding:3px 10px;border-radius:99px;background:#ffe4ef;color:#9d174d;border:1px solid #f9a8d4;display:inline-block;margin-bottom:12px;text-transform:uppercase}.fr-equation{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}.fr-side{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.fr-compound{font-family:var(--font-mono);font-size:14px;font-weight:800;background:var(--surface2);border:1.5px solid var(--border2);border-radius:10px;padding:6px 12px;color:var(--text)}.fr-plus{font-size:18px;font-weight:800;color:var(--text-muted)}.fr-arrow{font-size:20px;color:#9d174d;font-weight:900}.fr-desc{font-size:12px;color:var(--text-muted);font-weight:600;line-height:1.65}.fr-fact{margin-top:10px;font-size:11px;font-family:var(--font-mono);font-weight:700;color:var(--accent)}.balance-intro{font-size:14px;color:var(--text-muted);font-weight:600;margin-bottom:20px;line-height:1.7;max-width:640px}.eq-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.eq-nav-btn{font-family:var(--font-mono);font-size:11px;font-weight:800;padding:6px 14px;border-radius:99px;border:1.5px solid var(--border2);background:var(--surface2);color:var(--text-muted);cursor:pointer;transition:all .15s}.eq-nav-btn.active{background:#ffe4ef;border-color:#f9a8d4;color:#9d174d}.balance-board{background:var(--surface);border:1.5px solid var(--border2);border-radius:20px;padding:28px;margin-bottom:16px}.eq-name{font-size:18px;font-weight:800;margin-bottom:6px}.eq-context{font-size:13px;color:var(--text-muted);font-weight:600;margin-bottom:20px}.eq-display{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:24px;padding:20px;background:var(--surface2);border-radius:14px}.coef-block{display:flex;flex-direction:column;align-items:center;gap:6px}.coef-btn{background:none;border:1.5px solid var(--border2);border-radius:8px;width:28px;height:28px;font-size:16px;font-weight:800;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all .15s}.coef-btn:hover{background:var(--surface3);color:var(--text)}.coef-val{font-size:24px;font-weight:900;font-family:var(--font-mono);color:#9d174d;min-width:24px;text-align:center}.compound-sym{font-size:18px;font-weight:800;font-family:var(--font-mono);background:var(--surface);border:1.5px solid var(--border2);border-radius:10px;padding:8px 14px}.eq-plus-sign{font-size:22px;font-weight:800;color:var(--text-muted)}.eq-arrow-sign{font-size:26px;color:#9d174d;font-weight:900;padding:0 8px}.atom-counter{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;margin-bottom:20px}.atom-cell{background:var(--surface2);border-radius:10px;padding:10px 12px;border:1.5px solid var(--border2);text-align:center}.atom-cell.balanced{background:#d1fae5;border-color:#6ee7b7}.atom-cell.unbalanced{background:#fee2e2;border-color:#fca5a5}.atom-sym{font-size:16px;font-weight:800;margin-bottom:4px}.atom-counts{font-family:var(--font-mono);font-size:11px;font-weight:700;color:var(--text-muted)}.balance-status{font-size:16px;font-weight:800;padding:14px 20px;border-radius:12px;text-align:center;margin-bottom:12px;transition:all .2s}.balance-status.checking{background:var(--surface2);color:var(--text-muted)}.balance-status.balanced{background:#d1fae5;color:#064e3b}.balance-status.unbalanced{background:#fee2e2;color:#991b1b}.hint-btn{font-family:var(--font-mono);font-size:12px;font-weight:800;padding:8px 18px;border-radius:99px;border:1.5px solid var(--border2);background:var(--surface2);color:var(--text-muted);cursor:pointer;margin-right:8px;transition:all .15s}.hint-btn:hover{background:var(--surface3)}.reset-btn{font-family:var(--font-mono);font-size:12px;font-weight:800;padding:8px 18px;border-radius:99px;border:1.5px solid #f9a8d4;background:#ffe4ef;color:#9d174d;cursor:pointer;transition:all .15s}.reset-btn:hover{background:#fecdd3}.hint-box{display:none;background:#fef3c7;border:1.5px solid #fcd34d;border-radius:12px;padding:14px 18px;font-size:13px;font-weight:700;color:#78350f;margin-top:12px;line-height:1.6}@media (max-width: 640px){.rt-grid,.fr-grid{grid-template-columns:1fr}.eq-display{gap:8px;padding:14px}.coef-val{font-size:20px}.compound-sym{font-size:15px;padding:6px 10px}}