:root{--bg-primary:#f8f9fa;--bg-secondary:#ffffff;--text-primary:#1a1a2e;--text-secondary:#4a4a68;--border-color:#e0e0e0;--shadow:0 4px 20px rgba(0, 0, 0, 0.08);--shadow-hover:0 8px 30px rgba(0, 0, 0, 0.15);--alkali-metal:#ff6b9d;--alkaline-earth:#ffa94d;--transition-metal:#ffd43b;--post-transition-metal:#4dabf7;--metalloid:#69db7c;--nonmetal:#38d9a9;--halogen:#be4bdb;--noble-gas:#74c0fc;--lanthanide:#f8a5c2;--actinide:#e84393;--unknown:#868e96;--element-size:70px;--gap:3px;--radius:8px;--transition:all 0.3s ease}[data-theme="dark"]{--bg-primary:#0f0f1a;--bg-secondary:#1a1a2e;--text-primary:#f8f9fa;--text-secondary:#a0a0b8;--border-color:#2a2a40;--shadow:0 4px 20px rgba(0, 0, 0, 0.3);--shadow-hover:0 8px 30px rgba(0, 0, 0, 0.5)}*{margin:0;padding:0;box-sizing:border-box}html,body{overflow-x:hidden}body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;transition:var(--transition)}.app-container{max-width:100%;margin:0;padding:10px 0}.app-container.is-fullscreen,.app-container:fullscreen,.app-container:-webkit-full-screen,.app-container:-moz-full-screen{position:fixed;inset:0;width:100vw;height:100vh;max-width:none;margin:0;z-index:2147483646;overflow-y:auto;padding:10px}html:not([data-theme="dark"]) .app-container.is-fullscreen,html:not([data-theme="dark"]) .app-container:fullscreen,html:not([data-theme="dark"]) .app-container:-webkit-full-screen,html:not([data-theme="dark"]) .app-container:-moz-full-screen{background:#ffffff!important}html[data-theme="dark"] .app-container.is-fullscreen,html[data-theme="dark"] .app-container:fullscreen,html[data-theme="dark"] .app-container:-webkit-full-screen,html[data-theme="dark"] 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h1{font-size:1.8rem;font-weight:700;color:#4f883d}.header-controls{display:flex;align-items:center;gap:15px}.search-container{position:relative}.search-container input{width:250px;padding:12px 45px 12px 20px;border:2px solid var(--border-color);border-radius:25px;font-size:.95rem;background:var(--bg-primary);color:var(--text-primary);transition:var(--transition)}.search-container input:focus{outline:none;border-color:var(--alkali-metal);box-shadow:0 0 0 3px rgb(255 107 157 / .2)}.search-icon{position:absolute;right:15px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--text-secondary)}.theme-toggle{width:45px;height:45px;border:none;border-radius:50%;background:var(--bg-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition);border:2px solid var(--border-color)}.theme-toggle:hover{transform:rotate(15deg);border-color:var(--alkali-metal)}.theme-toggle svg{width:22px;height:22px;color:var(--text-primary)}.moon-icon{display:none}[data-theme="dark"] .sun-icon{display:none}[data-theme="dark"] .moon-icon{display:block}.fullscreen-toggle{width:45px;height:45px;border:none;border-radius:50%;background:var(--bg-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition);border:2px solid var(--border-color)}.fullscreen-toggle:hover{transform:scale(1.1);border-color:var(--noble-gas)}.fullscreen-toggle svg{width:22px;height:22px;color:var(--text-primary)}.compress-icon{display:none}.fullscreen-active .expand-icon{display:none}.fullscreen-active .compress-icon{display:block}.filters-panel{display:flex;gap:15px;padding:12px 15px;background:var(--bg-secondary);border-radius:16px;margin:0 8px 12px;box-shadow:var(--shadow);flex-wrap:wrap}.filter-section h3{font-size:.9rem;font-weight:600;color:var(--text-secondary);margin-bottom:12px;text-transform:uppercase;letter-spacing:.5px}.category-filters{display:flex;flex-wrap:wrap;gap:10px}.filter-checkbox{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.85rem;padding:6px 12px;border-radius:20px;background:var(--bg-primary);transition:var(--transition)}.filter-checkbox:hover{transform:translateY(-2px)}.filter-checkbox input{display:none}.checkmark{width:16px;height:16px;border-radius:4px;position:relative}.checkmark::after{content:'✓';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:10px;font-weight:700}.filter-checkbox input:not(:checked)+.checkmark::after{display:none}.filter-checkbox 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var(--border-color);border-radius:20px;background:var(--bg-primary);color:var(--text-primary);font-size:.85rem;cursor:pointer;transition:var(--transition)}.state-btn:hover{border-color:var(--alkali-metal)}.state-btn.active{background:linear-gradient(135deg,var(--alkali-metal),var(--halogen));border-color:#fff0;color:#fff}.periodic-table-wrapper{overflow:hidden;padding:10px 0;margin:0 0 12px;width:100%}.periodic-table-scaler{transform-origin:top center;width:100%;transition:transform 0.2s ease;display:flex;justify-content:center}.periodic-table{display:grid;grid-template-columns:repeat(18,var(--element-size));grid-template-rows:repeat(10,var(--element-size));gap:var(--gap);flex-shrink:0}.element{width:var(--element-size);height:var(--element-size);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);position:relative;overflow:hidden}.element::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgb(255 255 255 / .2),transparent);pointer-events:none}.element:hover{transform:scale(1.15);z-index:10;box-shadow:var(--shadow-hover)}.element .atomic-number{font-size:.65rem;font-weight:500;opacity:.8;position:absolute;top:4px;left:6px}.element .symbol{font-size:1.4rem;font-weight:700;line-height:1}.element .name{font-size:.5rem;font-weight:500;margin-top:2px;text-align:center;max-width:90%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.element.alkali-metal{background:var(--alkali-metal);color:#1a1a2e}.element.alkaline-earth{background:var(--alkaline-earth);color:#1a1a2e}.element.transition-metal{background:var(--transition-metal);color:#1a1a2e}.element.post-transition-metal{background:var(--post-transition-metal);color:#1a1a2e}.element.metalloid{background:var(--metalloid);color:#1a1a2e}.element.nonmetal{background:var(--nonmetal);color:#1a1a2e}.element.halogen{background:var(--halogen);color:#fff}.element.noble-gas{background:var(--noble-gas);color:#1a1a2e}.element.lanthanide{background:var(--lanthanide);color:#1a1a2e}.element.actinide{background:var(--actinide);color:#fff}.element.unknown{background:var(--unknown);color:#fff}.element.highlight-state{box-shadow:0 0 0 3px #fff,0 0 20px 8px rgb(255 255 255 / .6);animation:pulseGlow 1.5s ease-in-out infinite;z-index:5}@keyframes pulseGlow{0%,100%{box-shadow:0 0 0 3px #fff,0 0 20px 8px rgb(255 255 255 / .6)}50%{box-shadow:0 0 0 4px #fff,0 0 30px 12px rgb(255 255 255 / .8)}}.element.dimmed{opacity:.15;filter:grayscale(80%);transform:scale(.92)}.element.hidden{opacity:.12;pointer-events:none;transform:scale(.92);filter:grayscale(90%)}.element.placeholder{background:#fff0;border:2px dashed var(--border-color);font-size:.7rem;color:var(--text-secondary)}.detail-panel{position:fixed;top:0;right:-450px;width:420px;height:100vh;background:var(--bg-secondary);box-shadow:-10px 0 40px rgb(0 0 0 / .2);padding:30px;overflow-y:auto;transition:right 0.4s cubic-bezier(.4,0,.2,1);z-index:1000}.detail-panel.active{right:0}.close-panel{position:absolute;top:20px;right:20px;width:40px;height:40px;border:none;background:var(--bg-primary);border-radius:50%;font-size:1.5rem;cursor:pointer;color:var(--text-primary);transition:var(--transition)}.close-panel:hover{background:var(--alkali-metal);color:#fff;transform:rotate(90deg)}.detail-header{display:flex;align-items:center;gap:20px;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid var(--border-color)}.detail-symbol{width:80px;height:80px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--alkali-metal),var(--halogen));color:#fff}.detail-names h2{font-size:1.5rem;font-weight:700}.detail-names p{font-size:1rem;color:var(--text-secondary);font-style:italic}.detail-number{margin-left:auto;font-size:2rem;font-weight:300;color:var(--text-secondary)}.detail-properties{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-bottom:25px}.property{background:var(--bg-primary);padding:15px;border-radius:12px}.property-label{display:block;font-size:.75rem;color:var(--text-secondary);margin-bottom:5px;text-transform:uppercase;letter-spacing:.3px}.property-value{font-size:1rem;font-weight:600;color:var(--text-primary)}.detail-description{background:var(--bg-primary);padding:20px;border-radius:12px;margin-bottom:25px}.detail-description h3{font-size:.9rem;font-weight:600;margin-bottom:10px;color:var(--text-secondary)}.detail-description p{line-height:1.6;color:var(--text-primary)}.bohr-model-container{background:var(--bg-primary);padding:20px;border-radius:12px;text-align:center}.bohr-model-container h3{font-size:.9rem;font-weight:600;margin-bottom:15px;color:var(--text-secondary)}#bohrCanvas{background:var(--bg-secondary);border-radius:50%;margin-bottom:15px}.atom-structure-info{text-align:left}.particle-counts{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-bottom:12px}.particle-count{display:flex;align-items:center;gap:6px;font-size:.85rem}.particle-dot{width:12px;height:12px;border-radius:50%}.proton-dot{background:linear-gradient(135deg,#ff6b6b,#e63946);box-shadow:0 0 8px rgb(230 57 70 / .5)}.neutron-dot{background:linear-gradient(135deg,#adb5bd,#868e96);box-shadow:0 0 8px rgb(134 142 150 / .5)}.electron-dot{background:linear-gradient(135deg,#74c0fc,#339af0);box-shadow:0 0 8px rgb(51 154 240 / .5)}.particle-label{color:var(--text-secondary);font-size:.8rem}.particle-value{font-weight:700;color:var(--text-primary)}.electron-shells{background:var(--bg-secondary);border-radius:8px;padding:10px 12px;margin-top:10px}.electron-shells-title{font-size:.75rem;color:var(--text-secondary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}.shells-list{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.shell-badge{background:linear-gradient(135deg,#74c0fc,#339af0);color:#fff;padding:4px 10px;border-radius:12px;font-size:.75rem;font-weight:600}.shell-badge span{opacity:.8;font-weight:400}.overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgb(0 0 0 / .5);opacity:0;visibility:hidden;transition:var(--transition);z-index:999}.overlay.active{opacity:1;visibility:visible}.legend{padding:15px 20px;background:var(--bg-secondary);border-radius:16px;box-shadow:var(--shadow);margin:0 8px}.legend h3{font-size:.9rem;font-weight:600;color:var(--text-secondary);margin-bottom:15px;text-transform:uppercase;letter-spacing:.5px}.legend-items{display:flex;flex-wrap:wrap;gap:15px}.legend-item{display:flex;align-items:center;gap:8px;font-size:.85rem}.legend-color{width:20px;height:20px;border-radius:4px}.legend-color.alkali-metal{background:var(--alkali-metal)}.legend-color.alkaline-earth{background:var(--alkaline-earth)}.legend-color.transition-metal{background:var(--transition-metal)}.legend-color.post-transition-metal{background:var(--post-transition-metal)}.legend-color.metalloid{background:var(--metalloid)}.legend-color.nonmetal{background:var(--nonmetal)}.legend-color.halogen{background:var(--halogen)}.legend-color.noble-gas{background:var(--noble-gas)}.legend-color.lanthanide{background:var(--lanthanide)}.legend-color.actinide{background:var(--actinide)}@media (max-width:1200px){:root{--element-size:55px}.header h1{font-size:1.4rem}}@media (max-width:900px){.header{flex-direction:column;gap:15px;text-align:center}.filters-panel{flex-direction:column}.detail-panel{width:100%;right:-100%}:root{--element-size:45px}.element .name{display:none}}@media (max-width:600px){.app-container{padding:10px}.search-container input{width:180px}:root{--element-size:38px}.element .symbol{font-size:1rem}.element .atomic-number{font-size:.5rem}.legend-items{display:grid;grid-template-columns:1fr 1fr}}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.element{animation:fadeIn 0.5s ease forwards}.element:nth-child(n){animation-delay:calc(var(--index, 0) * 0.01s)}.comparison-section{flex:1}.compare-toggle-btn{display:flex;align-items:center;gap:10px;padding:10px 18px;border:2px solid var(--border-color);border-radius:25px;background:var(--bg-primary);color:var(--text-primary);font-size:.9rem;font-weight:500;cursor:pointer;transition:var(--transition)}.compare-toggle-btn:hover{border-color:var(--halogen);background:var(--halogen);color:#fff}.compare-toggle-btn.active{background:linear-gradient(135deg,var(--halogen),var(--alkali-metal));border-color:#fff0;color:#fff}.compare-toggle-btn svg{width:18px;height:18px}.compare-slots{display:none;align-items:center;gap:12px;margin-top:12px;flex-wrap:wrap}.compare-slots.active{display:flex}.compare-slot{display:flex;align-items:center;gap:8px;padding:8px 14px;background:var(--bg-primary);border:2px dashed var(--border-color);border-radius:10px;min-width:120px;transition:var(--transition)}.compare-slot.filled{border-style:solid;border-color:var(--halogen);background:rgb(190 75 219 / .1)}.slot-label{font-weight:600;color:var(--halogen)}.slot-element{font-size:.9rem;color:var(--text-secondary)}.compare-slot.filled .slot-element{color:var(--text-primary);font-weight:600}.vs-label{font-weight:700;color:var(--text-secondary);font-size:.85rem}.run-compare-btn{padding:8px 20px;background:linear-gradient(135deg,var(--halogen),var(--alkali-metal));border:none;border-radius:20px;color:#fff;font-weight:600;cursor:pointer;transition:var(--transition)}.run-compare-btn:disabled{opacity:.5;cursor:not-allowed}.run-compare-btn:not(:disabled):hover{transform:scale(1.05);box-shadow:0 4px 15px rgb(190 75 219 / .4)}.clear-compare-btn{width:32px;height:32px;border:none;border-radius:50%;background:var(--bg-primary);color:var(--text-secondary);font-size:1.2rem;cursor:pointer;transition:var(--transition)}.clear-compare-btn:hover{background:#ff6b6b;color:#fff}.element.compare-mode{cursor:crosshair}.element.compare-selected{box-shadow:0 0 0 4px var(--halogen),0 0 20px 5px rgb(190 75 219 / .5);z-index:5}.compare-modal{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(.9);width:90%;max-width:900px;max-height:90vh;background:var(--bg-secondary);border-radius:20px;box-shadow:0 25px 80px rgb(0 0 0 / .3);z-index:1100;opacity:0;visibility:hidden;transition:all 0.3s ease;overflow:hidden}.compare-modal.active{opacity:1;visibility:visible;transform:translate(-50%,-50%) scale(1)}.compare-modal-content{padding:30px;max-height:90vh;overflow-y:auto}.close-compare{position:absolute;top:15px;right:15px;width:40px;height:40px;border:none;background:var(--bg-primary);border-radius:50%;font-size:1.5rem;cursor:pointer;color:var(--text-primary);transition:var(--transition);z-index:10}.close-compare:hover{background:#ff6b6b;color:#fff;transform:rotate(90deg)}.compare-title{text-align:center;font-size:1.5rem;margin-bottom:25px;background:linear-gradient(135deg,var(--halogen),var(--alkali-metal));-webkit-background-clip:text;-webkit-text-fill-color:#fff0;background-clip:text}.compare-elements{display:flex;justify-content:center;align-items:center;gap:30px;margin-bottom:30px}.compare-element{text-align:center}.compare-symbol{width:80px;height:80px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:2.2rem;font-weight:700;margin:0 auto 10px;color:#1a1a2e}.compare-name{font-size:1.1rem;font-weight:600;margin-bottom:15px}.compare-element canvas{background:var(--bg-primary);border-radius:50%}.compare-vs{font-size:2rem;font-weight:800;color:var(--halogen);text-shadow:0 0 20px rgb(190 75 219 / .5)}.compare-table-wrapper{overflow-x:auto}.compare-table{width:100%;border-collapse:collapse;margin-top:10px}.compare-table th,.compare-table td{padding:12px 15px;text-align:left;border-bottom:1px solid var(--border-color)}.compare-table th{background:var(--bg-primary);font-weight:600;font-size:.85rem;text-transform:uppercase;color:var(--text-secondary)}.compare-table th:first-child{border-radius:8px 0 0 8px}.compare-table th:last-child{border-radius:0 8px 8px 0}.compare-table td{font-size:.95rem}.compare-table tbody tr:hover{background:rgb(190 75 219 / .05)}.compare-table .winner{color:#2ecc71;font-weight:600}.compare-table .loser{color:var(--text-secondary)}.compare-table .diff-positive{color:#2ecc71}.compare-table .diff-negative{color:#e74c3c}.compare-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgb(0 0 0 / .6);backdrop-filter:blur(5px);z-index:1050;opacity:0;visibility:hidden;transition:var(--transition)}.compare-overlay.active{opacity:1;visibility:visible}@media (max-width:700px){.compare-elements{flex-direction:column;gap:15px}.compare-vs{font-size:1.5rem}.compare-modal-content{padding:20px}}