:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.app{min-height:100vh;background:linear-gradient(135deg,#0f172a,#1e293b,#0f172a)}.home-page{min-height:100vh;display:flex;flex-direction:column}.app-header{text-align:center;padding:40px 20px;background:linear-gradient(180deg,#0f172acc,#1e293b99);border-bottom:1px solid rgba(148,163,184,.1)}.app-header h1{font-size:3rem;font-weight:700;margin:0 0 16px;background:linear-gradient(135deg,#60a5fa,#a78bfa,#f472b6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 30px rgba(96,165,250,.3)}.app-subtitle{font-size:1.125rem;color:#94a3b8;margin:0}.app-main{flex:1;padding:20px;display:flex;justify-content:center;align-items:flex-start}@media(max-width:768px){.app-header h1{font-size:2rem}.app-subtitle{font-size:1rem}}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.element-detail-page{min-height:100vh;background:linear-gradient(135deg,#0f172a,#1e293b,#0f172a);color:#e2e8f0;padding:20px}.element-detail-header{max-width:1400px;margin:0 auto 30px}.back-button{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px -1px #3b82f64d}.back-button:hover{transform:translateY(-2px);box-shadow:0 8px 12px -1px #3b82f666}.back-button .arrow{font-size:1.2rem}.element-detail-content{max-width:1400px;margin:0 auto;display:grid;grid-template-columns:1fr 1.5fr;gap:40px;align-items:start}.element-info-section{background:#1e293b99;border-radius:20px;padding:30px;border:1px solid rgba(148,163,184,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.element-header{text-align:center;margin-bottom:30px}.element-symbol-container{position:relative;display:inline-block;margin-bottom:16px}.element-symbol{font-size:5rem;font-weight:700;background:linear-gradient(135deg,#60a5fa,#a78bfa,#f472b6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:block}.atomic-number-badge{position:absolute;top:-8px;right:-16px;background:linear-gradient(135deg,#ef4444,#f97316);color:#fff;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:600;box-shadow:0 4px 6px -1px #ef44444d}.element-name{font-size:2.5rem;font-weight:700;margin:0 0 8px;color:#f8fafc}.element-category{display:inline-block;padding:6px 16px;background:#3b82f633;border:1px solid rgba(59,130,246,.3);border-radius:20px;font-size:.875rem;color:#60a5fa;text-transform:uppercase;letter-spacing:.5px}.element-properties{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:30px}.property-card{background:#0f172a80;border-radius:12px;padding:20px;text-align:center;border:1px solid rgba(148,163,184,.1);transition:transform .2s ease}.property-card:hover{transform:translateY(-2px);border-color:#3b82f64d}.property-card h3{font-size:.75rem;font-weight:500;color:#94a3b8;margin:0 0 8px;text-transform:uppercase;letter-spacing:.5px}.property-value{font-size:1.5rem;font-weight:700;color:#f8fafc;margin:0}.electron-configuration{background:#0f172a80;border-radius:12px;padding:24px;border:1px solid rgba(148,163,184,.1)}.electron-configuration h3{font-size:1rem;font-weight:600;color:#f8fafc;margin:0 0 16px}.configuration-text{font-size:1.25rem;font-weight:600;color:#60a5fa;margin:0 0 20px;padding:12px;background:#3b82f61a;border-radius:8px;text-align:center;font-family:Courier New,monospace}.electron-shells{display:flex;flex-direction:column;gap:8px}.shell-item{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:#1e293b80;border-radius:8px;font-size:.875rem}.shell-label{color:#94a3b8}.shell-value{color:#f8fafc;font-weight:500}.element-model-section{background:#1e293b99;border-radius:20px;padding:30px;border:1px solid rgba(148,163,184,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.element-model-section h2{font-size:1.5rem;font-weight:600;color:#f8fafc;margin:0 0 8px}.model-instructions{color:#94a3b8;font-size:.875rem;margin:0 0 20px}.model-container{width:100%;height:500px;border-radius:16px;overflow:hidden;background:linear-gradient(to bottom,#0f172a,#1e293b);box-shadow:inset 0 2px 4px #0000004d}.model-legend{display:flex;justify-content:center;gap:30px;margin-top:20px;padding-top:20px;border-top:1px solid rgba(148,163,184,.1)}.legend-item{display:flex;align-items:center;gap:8px;font-size:.875rem;color:#e2e8f0}.legend-color{width:16px;height:16px;border-radius:50%;display:inline-block}.legend-color.proton{background:#ef4444}.legend-color.neutron{background:#22c55e}.legend-color.electron{background:#3b82f6}.element-detail-error{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f172a,#1e293b);color:#e2e8f0;padding:20px;text-align:center}.element-detail-error h1{font-size:2.5rem;margin:0 0 16px;color:#ef4444}.element-detail-error p{font-size:1.125rem;color:#94a3b8;margin:0 0 32px}@media(max-width:1024px){.element-detail-content{grid-template-columns:1fr;gap:30px}.model-container{height:400px}}@media(max-width:640px){.element-symbol{font-size:3.5rem}.element-name{font-size:1.75rem}.element-properties{grid-template-columns:1fr}.model-container{height:350px}.model-legend{flex-direction:column;gap:12px}}