*{box-sizing:border-box;margin:0;padding:0}:root{--background-color:#121212;--text-color:#e0e0e0;--button-bg:#2a2a2a;--button-hover:#3a3a3a;--header-bg:#232323;--grid-cell-bg:#2a2a2a;--grid-border:#666;--mirror-color:#0ff}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background-color);color:var(--text-color);margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;transition:background-color .3s,color .3s}.App{text-align:center}.logo{pointer-events:none;height:40vmin;animation:20s linear infinite logo-spin}.header{background-color:var(--header-bg);min-height:100vh;color:var(--text-color);flex-direction:column;justify-content:center;align-items:center;font-size:calc(10px + 2vmin);transition:background-color .3s;display:flex}.link{color:#b318f0}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.app.dark-theme,.app.light-theme{background-color:var(--background-color);color:var(--text-color);width:100%;min-height:100vh}.container{flex-direction:column;align-items:center;width:100%;max-width:100vw;min-height:auto;padding:20px;display:flex;overflow-x:hidden}header{background-color:var(--header-bg);width:100%;color:var(--text-color);padding:.8rem 1rem;transition:background-color .3s}nav{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:0 1rem;display:flex}.nav-brand{align-items:center;display:flex}.nav-links{align-items:center;gap:1.2rem;display:flex}nav a{color:var(--text-color);cursor:pointer;padding:.5rem .8rem;font-size:1.1em;text-decoration:none;transition:color .3s}nav a:hover{text-decoration:underline}.nav-brand .home-link{font-size:1.2em;font-weight:700}.grid-container{aspect-ratio:1;border:1px solid var(--grid-border);grid-template-rows:repeat(14,minmax(0,1fr));grid-template-columns:repeat(14,minmax(0,1fr));width:100%;max-width:min(100vw - 40px,700px);max-height:min(100vw - 40px,700px);margin:20px auto 40px;padding:0;display:grid;position:relative;overflow:visible!important}.number{width:100%;height:100%;color:var(--text-color);justify-content:center;align-items:center;font-size:14px;display:flex}.dot{width:100%;height:100%;color:var(--text-color);justify-content:center;align-items:center;font-size:18px;display:flex}.grid-cell{box-sizing:border-box;border:1px solid var(--grid-border);background-color:var(--grid-cell-bg);cursor:pointer;width:100%;height:100%;transition:background-color .3s,border-color .3s;position:relative}.mirror-overlay{pointer-events:none;width:100%;height:100%;position:absolute;top:0;left:0}.mirror-overlay line{stroke:var(--mirror-color);stroke-width:2.5px;transition:stroke .3s}.line-overlay{pointer-events:none;width:100%;height:100%;position:absolute;top:0;left:0;overflow:visible!important}.button-container{flex-wrap:wrap;justify-content:center;gap:10px;margin:10px 0;display:flex}button{background-color:var(--button-bg);color:var(--text-color);cursor:pointer;border:none;border-radius:4px;margin:4px;padding:8px 16px;transition:background-color .3s,color .3s}button:hover{background-color:var(--button-hover)}.theme-toggle{background-color:var(--button-bg);color:var(--text-color);border:1px solid var(--grid-border);z-index:1;justify-content:center;align-items:center;gap:8px;font-weight:700;display:flex;position:relative;overflow:hidden}.theme-toggle:hover{background-color:var(--button-hover);transition:all .3s;transform:translateY(-2px);box-shadow:0 3px 8px #0003}.flash-animation{animation:.1s ease-in-out 3 flash,2s .3s infinite pulse-green}@keyframes flash{0%,to{background-color:#2a2a2a}50%{background-color:#4f9e4f}}@keyframes pulse-green{0%{background-color:#2a2a2a}50%{background-color:#4f9e4f}to{background-color:#2a2a2a}}.burger-menu{cursor:pointer;z-index:10;background:0 0;border:none;flex-direction:column;justify-content:space-between;width:30px;height:21px;padding:0;display:none}.burger-menu span{background-color:#fff;width:100%;height:3px;transition:all .3s ease-in-out}.burger-menu span.active:first-child{transform:rotate(45deg)translate(6px,6px)}.burger-menu span.active:nth-child(2){opacity:0}.burger-menu span.active:nth-child(3){transform:rotate(-45deg)translate(6px,-6px)}.factorisation{text-align:center;max-width:800px;color:var(--text-color);margin:15px 0;font-size:15px;transition:color .3s}.missing-numbers{border:1px solid var(--grid-border);background-color:var(--grid-cell-bg);color:var(--text-color);border-radius:5px;max-width:800px;margin:15px 0;padding:10px;transition:all .3s}.laser-output.green{color:#4f9e4f}.laser-output.red{color:#f44}@media (width<=768px){nav{flex-wrap:wrap}.nav-brand{justify-content:space-between;width:100%}.burger-menu{display:flex}.nav-links{flex-direction:column;align-items:center;gap:.5rem;width:100%;padding:1rem 0;display:none}.nav-links.active{display:flex}nav a{text-align:center;width:100%;padding:.8rem}.grid-container{max-width:min(100vw - 20px,700px);max-height:min(100vw - 20px,700px)}.container{padding:10px}}@media (width<=480px){.number,.dot{font-size:12px}.grid-container{max-width:min(100vw - 10px,700px);max-height:min(100vw - 10px,700px)}.container{padding:5px}.button-container{flex-direction:column;align-items:stretch}button{margin:2px}}@keyframes pulse-highlight-once{0%{box-shadow:0 0 #ffff00b3}50%{box-shadow:0 0 12px #ff0}to{box-shadow:0 0 #ffff00b3}}.puzzle-highlight{animation:1.2s ease-in-out 3 pulse-highlight-once}.instructions{background-color:var(--grid-cell-bg);border:1px solid var(--grid-border);max-width:800px;color:var(--text-color);border-radius:8px;margin:40px auto;padding:20px;font-size:15px;line-height:1.6}.instructions h2{color:var(--text-color);margin-bottom:12px;font-size:1.5rem}