:root{--game-bg: rgb(40, 40, 120);--game-bg-darker: rgb(30, 30, 80);--edge-color: rgb(135, 206, 250);--selected-border: rgb(255, 255, 0);--goal-color: rgb(0, 200, 0);--goal-text: rgb(180, 220, 180);--node-bg: rgba(26, 26, 58, .9);--node-border: #4a4a8a;--reagent-btn-bg: #3a3a7a;--reagent-btn-hover: #4a4a9a;--text-light: rgb(255, 255, 255);--text-muted: rgb(150, 150, 150);--card-bg: rgba(40, 40, 100, .8);--card-border: rgba(135, 206, 250, .3)}.levels-page{min-height:100vh;background:var(--game-bg);padding:2rem}.levels-page h1{color:var(--text-light);margin-bottom:2rem}.levels-page .back-link{display:inline-block;margin-bottom:1.5rem}.levels-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.level-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:1.5rem;text-decoration:none;color:inherit;transition:all .15s ease}.level-card:hover{border-color:var(--edge-color);transform:translateY(-2px);box-shadow:0 4px 16px #87cefa33}.level-card h3{color:var(--text-light);margin:0 0 .5rem;font-size:1.1rem}.level-card p{color:var(--text-muted);margin:0;font-size:.875rem}.play-level{display:flex;height:100vh;background:var(--game-bg);overflow:hidden}.play-level .container{padding:0;max-width:none}.tree-area{flex:1;position:relative;overflow:auto;padding:1rem}.tree-header{position:absolute;top:1rem;left:1rem;right:260px;display:flex;justify-content:space-between;align-items:flex-start;z-index:10}.level-info{background:#00000080;padding:1rem 1.25rem;border-radius:8px;max-width:400px}.level-info h2{color:var(--text-light);margin:0 0 .5rem;font-size:1.1rem}.level-info p{color:var(--goal-text);margin:0;font-size:.875rem;line-height:1.4}.back-link{color:var(--text-muted);text-decoration:none;font-size:.875rem;background:#00000080;padding:.5rem .75rem;border-radius:6px}.back-link:hover{color:var(--text-light)}.game-error-message{position:absolute;top:100px;left:50%;transform:translate(-50%);background:#c83c3ce6;border:1px solid rgba(255,100,100,.6);color:#fff;padding:.75rem 1.5rem;border-radius:8px;font-size:.9rem;font-weight:500;z-index:100;animation:errorSlideIn .2s ease;box-shadow:0 4px 12px #0000004d}@keyframes errorSlideIn{0%{opacity:0;transform:translate(-50%) translateY(-10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.reagent-menu{width:250px;background:#1e1e50e6;border-left:1px solid #4a4a8a;padding:1rem;display:flex;flex-direction:column;gap:.5rem}.reagent-menu h3{color:var(--text-light);margin:0 0 .5rem;font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}.reagent-message{background:#ff646433;border:1px solid rgba(255,100,100,.4);color:#ffb4b4;padding:.5rem .75rem;border-radius:6px;font-size:.8rem;text-align:center;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.reagent-btn{width:100%;padding:.5rem .75rem;background:var(--reagent-btn-bg);border:1px solid #5a5aaa;border-radius:6px;color:var(--text-light);font-size:.875rem;cursor:pointer;text-align:left;transition:all .1s ease;display:flex;align-items:center;gap:.5rem}.reagent-svg{width:40px;height:40px;flex-shrink:0;display:flex;align-items:center;justify-content:center}.reagent-svg svg{width:100%;height:100%}.reagent-name{flex:1}.reagent-btn:hover:not(:disabled){background:var(--reagent-btn-hover);border-color:var(--edge-color)}.reagent-btn:disabled{opacity:.5;cursor:not-allowed}.reagent-btn.loading{opacity:.7}.flash-red{animation:flashRed .6s ease}@keyframes flashRed{0%{background:var(--reagent-btn-bg);border-color:#5a5aaa}20%{background:#c83c3ccc;border-color:#ff6464}to{background:var(--reagent-btn-bg);border-color:#5a5aaa}}.reagent-has-catalysts{color:var(--text-muted);font-size:.75rem;margin-left:auto}.catalyst-selector{background:#323264e6;border:1px solid var(--edge-color);border-radius:8px;padding:1rem;animation:fadeIn .2s ease}.catalyst-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem}.catalyst-reagent-name{color:var(--text-light);font-weight:600}.catalyst-cancel{background:transparent;border:none;color:var(--text-muted);font-size:1.25rem;cursor:pointer;padding:0 .25rem;line-height:1}.catalyst-cancel:hover{color:var(--text-light)}.catalyst-label{color:var(--text-muted);font-size:.75rem;margin-bottom:.5rem;text-transform:uppercase;letter-spacing:.05em}.catalyst-options{display:flex;flex-direction:column;gap:.5rem}.catalyst-option-btn{display:flex;flex-direction:column;align-items:flex-start;gap:.25rem;width:100%;padding:.75rem;background:var(--reagent-btn-bg);border:1px solid #5a5aaa;border-radius:6px;color:var(--text-light);font-size:.875rem;cursor:pointer;text-align:left;transition:all .1s ease}.catalyst-option-btn:hover:not(:disabled){background:var(--reagent-btn-hover);border-color:var(--edge-color)}.catalyst-option-btn:disabled{opacity:.6;cursor:not-allowed}.catalyst-description{color:var(--text-muted);font-size:.75rem}.reaction-tree{position:relative;width:100%;height:calc(100% - 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ease;overflow:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4px}.molecule-node:hover{border-color:var(--edge-color);background:#87cefa40}.molecule-node.selected{border-color:var(--selected-border);box-shadow:0 0 12px #ff06}.molecule-node.is-goal{border-color:var(--goal-color);box-shadow:0 0 12px #00c80066}.molecule-node svg{width:100%;height:100%}.molecule-node.node-new{animation:nodeAppear .4s ease-out}@keyframes nodeAppear{0%{opacity:0;transform:scale(.3) translateY(-20px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.node-reaction-label{position:absolute;top:-18px;left:50%;transform:translate(-50%);font-size:.65rem;color:var(--text-muted);white-space:nowrap;background:#0009;padding:2px 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1.5rem;font-size:1rem;border-radius:8px;cursor:pointer;transition:all .1s ease}.success-btn.primary{background:var(--goal-color);color:#fff;border:none}.success-btn.primary:hover{background:#00a800}.success-btn.secondary{background:transparent;color:var(--text-light);border:1px solid #5a5aaa}.success-btn.secondary:hover{background:#3a3a7a}.lesson-viewer{position:fixed;inset:0;background:var(--game-bg);display:flex;flex-direction:column;z-index:500}.lesson-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;border-bottom:1px solid var(--card-border)}.lesson-title{color:var(--text-light);font-size:1.5rem;margin:0}.lesson-skip-btn{background:transparent;border:1px solid var(--text-muted);color:var(--text-muted);padding:.5rem 1rem;border-radius:6px;cursor:pointer;font-size:.875rem;transition:all .15s 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h1{color:var(--text-light);margin-bottom:2rem}.lessons-page .back-link{display:inline-block;margin-bottom:1.5rem}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.lesson-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:1.5rem;text-decoration:none;color:inherit;transition:all .15s ease}.lesson-card:hover{border-color:var(--edge-color);transform:translateY(-2px);box-shadow:0 4px 16px #87cefa33}.lesson-card h3{color:var(--text-light);margin:0 0 .5rem;font-size:1.1rem}.lesson-card p{color:var(--text-muted);margin:0;font-size:.875rem;line-height:1.5}.lesson-detail-page{min-height:100vh;background:var(--game-bg)}.lesson-detail-page .back-link{position:absolute;top:1.5rem;left:2rem;z-index:10}:root{font-family:Inter,system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.5;font-weight:400;color:#fff;background-color:#282878;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}.container{max-width:1200px;margin:0 auto;padding:2rem}h1{font-size:2rem;font-weight:600;margin:0 0 .25rem}h2{font-size:1rem;font-weight:600;margin:0 0 1rem;color:#b4dcb4}.subtitle{color:#969696;margin:0 0 1.5rem}.status{margin-bottom:2rem;padding:.5rem 1rem;border-radius:6px;background:#0000004d;display:inline-block}.status-ready{color:#00c800}.status-loading{color:#969696}.layout{display:grid;grid-template-columns:280px 1fr;gap:2rem;align-items:start}.molecule-list{display:flex;flex-direction:column;gap:.5rem}.molecule-card{display:flex;flex-direction:column;align-items:flex-start;padding:.75rem 1rem;border:1px solid #e0e0e0;border-radius:8px;background:#fff;cursor:pointer;transition:all .15s ease;text-align:left;width:100%}.molecule-card:hover{border-color:#4a90d9;background:#f8fafc}.molecule-card.selected{border-color:#4a90d9;background:#e8f2fc;box-shadow:0 0 0 2px #4a90d933}.molecule-name{font-weight:500;color:#1a1a1a}.molecule-smiles{font-size:.75rem;color:#888;font-family:SF Mono,Menlo,monospace}.molecule-viewer{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:1.5rem}.svg-container{display:flex;justify-content:center;align-items:center;min-height:400px;background:#fafafa;border-radius:8px;margin-bottom:1rem}.svg-container svg{max-width:100%;height:auto}.loading,.placeholder{color:#969696}.smiles-display{display:block;text-align:center;font-size:.875rem;color:#666;font-family:SF Mono,Menlo,monospace;background:#f5f5f5;padding:.5rem 1rem;border-radius:6px}.error{color:#d32f2f;background:#ffebee;padding:1rem;border-radius:8px}code{font-family:SF 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p{color:#969696;margin:0;font-size:.875rem}.molecule-card{background:#282864cc;border-color:#87cefa4d}.molecule-card:hover{background:#32326ee6;border-color:#87cefa}.molecule-card.selected{background:#1e3a5fe6;border-color:#87cefa}.molecule-name{color:#fff}.molecule-viewer{background:#1a1a3ae6;border-color:#87cefa4d}.svg-container{background:#28287880}.smiles-display{background:#0000004d;color:#969696}.error{background:#c800004d;color:#ff9696}.breadcrumb{color:#969696}.breadcrumb a{color:#87cefa}