.navbar{position:fixed;top:0;left:0;z-index:1000;background:#000;padding:.75rem 1rem;box-sizing:border-box;border-bottom-right-radius:0}.navbar,.navbar-link{display:flex;align-items:center}.navbar-link{gap:.5rem;text-decoration:none;color:#fff;transition:opacity .2s}.navbar-link:hover{opacity:.8}.navbar-logo{flex-shrink:0;display:block;width:20px;height:20px}.navbar-text{font-size:1rem;font-weight:600;color:#fff;white-space:nowrap}@media (max-width:768px){.navbar{padding:.6rem .8rem}.navbar-text{font-size:.9rem}.navbar-logo{width:18px;height:18px}}.visualize-page{min-height:100vh;display:flex;flex-direction:column;background-color:#fff}.visualize-header{background:#fff;color:#000;padding:2rem 1rem 1.5rem;text-align:center;border-bottom:2px double #000}.visualize-header h1{margin:0;font-size:2.5rem;font-weight:700;font-family:Georgia,Times New Roman,Times,serif;letter-spacing:.03em;text-transform:uppercase}.visualize-header .header-link{color:inherit;text-decoration:none;cursor:pointer;transition:opacity .2s}.visualize-header .header-link:hover{opacity:.6}.visualize-header .subtitle{margin:.5rem 0 0;font-size:.75rem;font-style:normal;color:#666;font-weight:400;letter-spacing:.05em;text-transform:uppercase;font-family:Georgia,Times New Roman,Times,serif}.controls{background:#fff;padding:1.5rem;border-bottom:2px double #000;display:flex;flex-direction:column;gap:1rem;justify-content:center;align-items:center}@media (min-width:768px){.controls{flex-direction:row;gap:1.5rem}}.date-navigation{display:flex;align-items:center;gap:1rem;background:#fff;border:none;padding:.5rem 1.25rem}.nav-button{padding:.25rem .75rem;border:none;background:transparent;color:#000;font-size:1.25rem;font-weight:400;cursor:pointer;transition:all .2s;font-family:Georgia,Times New Roman,Times,serif;line-height:1}.nav-button:hover:not(:disabled){color:#666;opacity:.7}.nav-button:disabled{color:#ccc;cursor:not-allowed;opacity:.3}.current-date{font-size:.875rem;font-weight:400;color:#121212;font-family:Georgia,Times New Roman,Times,serif;min-width:250px;text-align:center;letter-spacing:.01em;line-height:1.4;text-transform:uppercase}.today-indicator{background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border-bottom:1px solid #38bdf8;border-top:1px solid #38bdf8;padding:.5rem 1rem;text-align:center}.today-badge{display:inline-block;padding:.25rem .75rem;background:#fff;border:1px solid #38bdf8;border-radius:3px;font-size:.7rem;font-weight:600;color:#0284c7;text-transform:uppercase;letter-spacing:.1em;font-family:Georgia,Times New Roman,Times,serif;box-shadow:0 1px 3px rgba(2,132,199,.15)}.difficulty-tabs{display:flex;gap:0;border:none;overflow:hidden}.tab{padding:.5rem 1.25rem;border:none;border-right:1px solid #ddd;background:#fff;color:#666;font-size:.875rem;font-weight:400;cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:.05em;font-family:Georgia,Times New Roman,Times,serif;line-height:1}.tab:last-child{border-right:none}.tab.active,.tab:hover{color:#000;background:transparent}.tab.active{font-weight:400;text-shadow:.5px 0 0 currentColor}.visualize-content{flex:1 1;display:flex;flex-direction:column;align-items:center;padding:1.5rem 1rem;gap:1.5rem;justify-content:flex-start}.visualization-description{text-align:center;padding:0 2rem .75rem;background:#fff;max-width:1200px;width:100%}.main-visualization-container{display:flex;flex-direction:column;align-items:center;gap:1rem;max-width:1200px;width:100%;justify-content:flex-start}@media (min-width:1024px){.main-visualization-container{flex-direction:row;align-items:flex-start;gap:1.5rem;justify-content:center}.board-section,.controls-section{flex:0 0 auto}}.visualization-description h2{margin:0 0 .25rem;font-size:1.25rem;font-weight:700;font-family:Georgia,Times New Roman,Times,serif;letter-spacing:.05em;text-transform:uppercase;color:#000}.visualization-description p{margin:0;font-size:.875rem;font-style:normal;color:#666;font-family:Georgia,Times New Roman,Times,serif}.status{background:#fff;padding:2rem;border:2px solid #000;max-width:500px;text-align:center}.status.loading{display:flex;flex-direction:column;align-items:center;gap:1rem}.status.loading p{font-family:Georgia,Times New Roman,Times,serif;font-size:1rem;font-style:italic}.spinner{width:40px;height:40px;border:3px solid #e0e0e0;border-top-color:#000;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.status.error{border:3px solid #8b0000}.status.error h3{color:#8b0000;margin-top:0;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.status.error h3,.status.error p{font-family:Georgia,Times New Roman,Times,serif}.board-section{flex:0 1 auto;min-width:0}.board-container,.board-section{display:flex;justify-content:center}.board-container{align-items:center}.pips-board{box-sizing:border-box}.cell{background-color:#e8e8e8;position:relative;border-radius:0;min-height:35px;min-width:35px}.empty-cell{background-color:transparent;border:none}.domino-left{background-color:#fff;border:2px solid #000;border-right:none;border-radius:0;position:relative}.domino-left:after{content:"";position:absolute;top:20%;right:0;bottom:20%;width:1.5px;background-color:#999}.domino-right{border:2px solid #000;border-left:none;border-radius:0}.domino-right,.domino-top{background-color:#fff;position:relative}.domino-top{border:2px solid #000;border-bottom:none;border-radius:0}.domino-top:after{content:"";position:absolute;left:20%;right:20%;bottom:0;height:1.5px;background-color:#999}.domino-bottom{background-color:#fff;border:2px solid #000;border-top:none;border-radius:0;position:relative}.region-cell{z-index:0}.domino-bottom,.domino-left,.domino-right,.domino-top{z-index:2}.controls-section{align-items:center;gap:1rem;max-width:350px;flex-shrink:0}.controls-section,.stats-panel{display:flex;flex-direction:column;width:100%}.stats-panel{background:#fff;border:1px solid #ddd;padding:1rem;gap:.5rem}.stat-item{display:flex;justify-content:space-between;align-items:center;font-family:Georgia,Times New Roman,Times,serif;font-size:.875rem}.stat-label{font-weight:400;color:#666}.stat-value{font-weight:600;color:#000;font-size:.9rem}.solved-indicator{justify-content:center;color:#006400;font-weight:600;font-size:.875rem;padding:.5rem;background:#f0f8f0;border:1px solid #90c090;margin-top:.5rem;text-transform:uppercase;letter-spacing:.05em}.control-buttons{display:flex;gap:.75rem;width:100%;justify-content:stretch}.control-button{padding:.6rem 1.2rem;border:1px solid #333;border-radius:0;font-size:.8rem;font-weight:600;cursor:pointer;transition:all .15s;text-transform:uppercase;letter-spacing:.05em;font-family:Georgia,Times New Roman,Times,serif;flex:1 1}.solve-button{background-color:#000;color:#fff}.solve-button:hover:not(:disabled){background-color:#333}.solve-button:disabled{background-color:#666;color:#ccc;cursor:not-allowed}.play-pause-button{background-color:#28a745;color:#fff;border-color:#28a745}.play-pause-button:hover:not(:disabled){background-color:green}.play-pause-button:disabled{background-color:#ccc;border-color:#ccc;color:#999;cursor:not-allowed}.reset-button{background-color:#fff;color:#000}.reset-button:hover{background-color:#f0f0f0}.speed-control{display:flex;flex-direction:column;gap:.5rem;width:100%}.speed-control label{font-family:Georgia,Times New Roman,Times,serif;font-weight:500;font-size:.9rem;color:#555;text-align:center}.speed-slider{width:100%;height:8px;border-radius:5px;background:#d3d3d3;outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none}.speed-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:#000;cursor:pointer}.speed-slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#000;cursor:pointer;border:none}.back-link{padding:.5rem 1rem;border:1px solid #ddd;background:#fff;color:#666;text-decoration:none;font-weight:400;font-family:Georgia,Times New Roman,Times,serif;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;transition:all .2s;cursor:pointer;display:block;width:100%;text-align:center}.back-link:hover{color:#000;border-color:#000}.app-footer{background:#fff;padding:1.5rem;text-align:center;border-top:2px double #000;margin-top:auto}.app-footer p{margin:.5rem 0;color:#666;font-size:.875rem;font-style:normal;font-family:Georgia,Times New Roman,Times,serif}.app-footer .footer-link,.app-footer a{color:#000;text-decoration:none;font-weight:400;border-bottom:1px solid transparent;transition:border-color .2s}.app-footer .footer-link:hover,.app-footer a:hover{border-bottom-color:#000}@media (max-width:768px){.visualize-header h1{font-size:1.75rem}.visualize-header .subtitle{font-size:.7rem}.visualize-content{padding:1rem}.visualization-description{padding:.75rem 1rem}.visualization-description h2{font-size:1.25rem}.visualization-description p{font-size:.85rem}.controls-section{max-width:100%}.date-navigation{width:100%}.current-date{min-width:auto;flex:1 1;font-size:.75rem}.today-indicator{padding:.4rem .75rem}.today-badge{font-size:.65rem;padding:.2rem .6rem}.difficulty-tabs{width:100%}.tab{flex:1 1;font-size:.75rem;padding:.5rem .75rem}.control-buttons{flex-direction:column}.control-button{width:100%}}