@import url(https://fonts.googleapis.com/css2?family=VT323&display=swap);.board-wrapper{display:flex;justify-content:center;margin-bottom:20px}.board-empty{color:#444;font-size:1.1rem;padding:40px;text-align:center}.sudoku-board{background:#fff;border-bottom:2px solid var(--border-light);border-left:2px solid var(--border-dark);border-right:2px solid var(--border-light);border-top:2px solid var(--border-dark);display:grid}.board-9x9{grid-template-columns:repeat(9,46px);grid-template-rows:repeat(9,46px)}.board-6x6{grid-template-columns:repeat(6,56px);grid-template-rows:repeat(6,56px)}.cell{align-items:center;background:#fff;border:1px solid var(--border-dark);color:var(--text-primary);cursor:pointer;display:flex;font-family:var(--font-main);font-size:1.2rem;font-weight:700;justify-content:center;transition:background-color .15s ease}.cell-given{background:#e0e0e0;cursor:default}.cell-selected{background:#ffc;outline:2px solid var(--text-accent);outline-offset:-2px;z-index:1}.cell-error{background:#ffe0e0;border:2px solid #c00}.cell-hint{animation:hint-pulse 1s ease-in-out infinite;background:#cfc;outline:2px dashed #060;outline-offset:-2px}@keyframes hint-pulse{0%,to{background:#cfc}50%{background:#a0f0a0}}.cell-locked{cursor:default;opacity:.85}.cell:hover{background:#f0f0d0}.cell-given:hover{background:#d8d8d8}.cell-selected:hover{background:#ffc}.cell-error:hover{background:#ffd0d0}.cell-value{pointer-events:none}.cell-input{background:#0000;border:none;caret-color:#0000;color:var(--text-accent);cursor:pointer;font-family:var(--font-main);font-size:1.2rem;font-weight:700;height:100%;text-align:center;width:100%}.cell-input,.cell-input:focus{outline:none}.cell-input::-webkit-inner-spin-button,.cell-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.board-9x9 .cell:nth-child(9n+3),.board-9x9 .cell:nth-child(9n+6){border-right:3px solid var(--text-primary)}.board-9x9 .cell:nth-child(n+19):nth-child(-n+27),.board-9x9 .cell:nth-child(n+46):nth-child(-n+54){border-bottom:3px solid var(--text-primary)}.board-6x6 .cell:nth-child(6n+3){border-right:3px solid var(--text-primary)}.board-6x6 .cell:nth-child(n+19):nth-child(-n+24),.board-6x6 .cell:nth-child(n+7):nth-child(-n+12){border-bottom:3px solid var(--text-primary)}.game-header{display:flex;justify-content:center;margin-bottom:16px}.timer-display{align-items:center;display:flex;flex-direction:column;gap:2px}.timer-label{color:#555;font-size:.72rem;text-transform:uppercase}.timer-value{color:#c00;font-family:var(--font-pixel);font-size:1.6rem}.game-controls-wrapper{margin-top:16px}.game-controls{display:flex;gap:8px;justify-content:center}.no-hints-msg{color:#c00;font-size:.85rem;font-weight:700;margin-top:8px;text-align:center}.hint-info{color:#555;font-size:.78rem;font-style:italic;margin-top:6px;text-align:center}.btn-hint{color:#060;font-weight:700}.congrats-banner{background:linear-gradient(90deg,navy,#57a4f6);border-bottom:2px solid var(--border-darker);border-left:2px solid var(--border-light);border-right:2px solid var(--border-darker);border-top:2px solid var(--border-light);margin:16px 0;padding:12px;text-align:center}.congrats-inner h2{color:gold;margin-bottom:4px}.congrats-inner p{color:#fff;font-size:.95rem}body.dark-mode .cell{background:#2a1a3e;color:#39ff14}body.dark-mode .cell-given{background:#3d2555;color:orange}body.dark-mode .cell-selected{background:#5a3d7a;outline-color:orange}body.dark-mode .cell-error{background:#4a1020;border-color:#f44}body.dark-mode .cell-hint{background:#1a4a1a;outline-color:#39ff14}body.dark-mode .cell:hover{background:#4a3060}body.dark-mode .cell-given:hover{background:#4a3565}body.dark-mode .cell-input{color:#39ff14}body.dark-mode .cell input:focus{background-color:#ffa50026}body.dark-mode .congrats-banner{background:linear-gradient(90deg,indigo,#8000ff,#9a4dff)}body.dark-mode .congrats-inner h2{color:#39ff14}body.dark-mode .timer-value{color:orange}body.dark-mode .timer-label{color:#b8b8b8}body.dark-mode .no-hints-msg{color:orange}body.dark-mode .hint-info{color:#b8b8b8}@media (max-width:768px){.board-9x9{grid-template-columns:repeat(9,34px);grid-template-rows:repeat(9,34px)}.board-6x6{grid-template-columns:repeat(6,44px);grid-template-rows:repeat(6,44px)}.cell,.cell-input{font-size:1rem}.game-controls{align-items:center;flex-direction:column}.game-controls .btn{max-width:240px;width:100%}}:root{--bg-color:teal;--window-bg:silver;--text-primary:#000;--text-accent:navy;--border-light:#fff;--border-dark:grey;--border-darker:#404040;--title-gradient:linear-gradient(90deg,navy,#57a4f6);--font-main:"Microsoft Sans Serif","Segoe UI",sans-serif;--font-pixel:"VT323",monospace;--nav-height:40px}body.dark-mode{--bg-color:#14004f;--window-bg:#4b2b63;--text-primary:#39ff14;--text-accent:orange;--border-light:grey;--border-dark:#000;--border-darker:#000;--title-gradient:linear-gradient(90deg,indigo,#8000ff,#9a4dff)}body.dark-mode .page-title-bar span{color:#39ff14}body.dark-mode .art-caption,body.dark-mode .credits-card p,body.dark-mode .feature-card p,body.dark-mode .form-footer,body.dark-mode .form-subheading,body.dark-mode .game-author,body.dark-mode .hero-subtitle,body.dark-mode .page-description,body.dark-mode .page-subtitle,body.dark-mode .rules-card p,body.dark-mode .rules-list{color:#b8b8b8}body.dark-mode .form-group input{background-color:#2a1a3e;border-color:#000 grey grey #000;border-style:solid;border-width:2px;color:#39ff14}body.dark-mode .styled-table{background:#2a1a3e;color:#39ff14}body.dark-mode .styled-table thead{background:#4b2b63}body.dark-mode .game-card:hover,body.dark-mode .styled-table tbody tr:hover{background-color:orange;color:#000}body.dark-mode .game-card:hover .game-author,body.dark-mode .game-card:hover .game-author span,body.dark-mode .game-card:hover .game-name{color:#000}body.dark-mode .credit-link:hover{background-color:orange;color:#000}.theme-toggle{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);border-top:2px solid #fff;border-top:2px solid var(--border-light);cursor:pointer;font-family:"Microsoft Sans Serif",Segoe UI,sans-serif;font-family:var(--font-main);font-size:.9rem;margin-left:8px;padding:2px 8px}.theme-toggle:active{border-bottom:2px solid #fff;border-bottom:2px solid var(--border-light);border-left:2px solid #404040;border-left:2px solid var(--border-darker);border-right:2px solid #fff;border-right:2px solid var(--border-light);border-top:2px solid #404040;border-top:2px solid var(--border-darker)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{background-color:teal;background-color:var(--bg-color);line-height:1.6;min-height:100vh;padding-top:56px;padding-top:calc(var(--nav-height) + 16px)}body,h1,h2,h3,h4,h5,h6{color:#000;color:var(--text-primary);font-family:"Microsoft Sans Serif",Segoe UI,sans-serif;font-family:var(--font-main)}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}h1{font-size:1.6rem}h2{font-size:1.3rem}h3{font-size:1.1rem}a{color:navy;color:var(--text-accent);text-decoration:underline}a:hover{color:#00f}img{display:block;height:auto;max-width:100%}.window-frame{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);border-top:2px solid #fff;border-top:2px solid var(--border-light);margin:16px auto;max-width:800px;width:90%}.page-title-bar{background:linear-gradient(90deg,navy,#57a4f6);background:var(--title-gradient);border-bottom:2px solid grey;border-bottom:2px solid var(--border-dark);color:#fff;font-size:1rem;font-weight:700;padding:6px 12px}.page-title-bar span{color:gold}.window-body{padding:16px}.window-panel{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);padding:16px}.navbar,.window-panel{border-top:2px solid #fff;border-top:2px solid var(--border-light)}.navbar{background-color:silver;background-color:var(--window-bg);border-bottom:2px solid grey;border-bottom:2px solid var(--border-dark);height:40px;height:var(--nav-height);left:0;padding:0 8px;position:fixed;top:0;width:100%;z-index:1000}.navbar,.navbar .nav-brand{align-items:center;display:flex}.navbar .nav-brand{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);border-top:2px solid #fff;border-top:2px solid var(--border-light);color:#000;color:var(--text-primary);font-family:"Microsoft Sans Serif",Segoe UI,sans-serif;font-family:var(--font-main);font-size:.95rem;font-weight:700;gap:4px;margin-right:auto;padding:2px 10px;text-decoration:none}.navbar .nav-brand span{color:navy;color:var(--text-accent)}.nav-links{align-items:center;display:flex;gap:2px;list-style:none}.nav-links li a{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);border-top:2px solid #fff;border-top:2px solid var(--border-light);color:#000;color:var(--text-primary);display:block;font-size:.82rem;padding:4px 10px;text-decoration:none}.nav-links li a:hover{background-color:#d0d0d0}.nav-links li a.nav-active,.nav-links li a:active{border-bottom:2px solid #fff;border-bottom:2px solid var(--border-light);border-left:2px solid #404040;border-left:2px solid var(--border-darker);border-right:2px solid #fff;border-right:2px solid var(--border-light);border-top:2px solid #404040;border-top:2px solid var(--border-darker)}.nav-links li a.nav-active{background:#b0b0b0;font-weight:700}.btn{background:silver;background:var(--window-bg);border-bottom:2px solid #404040;border-bottom:2px solid var(--border-darker);border-left:2px solid #fff;border-left:2px solid var(--border-light);border-right:2px solid #404040;border-right:2px solid var(--border-darker);border-top:2px solid #fff;border-top:2px solid var(--border-light);color:#000;color:var(--text-primary);cursor:pointer;display:inline-block;font-family:"Microsoft Sans Serif",Segoe UI,sans-serif;font-family:var(--font-main);font-size:.9rem;padding:6px 20px;text-align:center;text-decoration:none;transition:background-color .2s ease,transform .15s ease}.btn:hover{background:#d0d0d0;transform:translateY(-1px)}.btn:active{border-bottom:2px solid #fff;border-bottom:2px solid var(--border-light);border-left:2px solid #404040;border-left:2px solid var(--border-darker);border-right:2px solid #fff;border-right:2px solid var(--border-light);border-top:2px solid #404040;border-top:2px solid var(--border-darker);transform:translateY(0)}.form-frame{max-width:420px}.form-heading{color:navy;color:var(--text-accent);margin-bottom:2px}.form-subheading{color:#444;font-size:.85rem;margin-bottom:20px}.form-group{display:flex;flex-direction:column;gap:4px;margin-bottom:14px}.form-group label{font-size:.85rem}.form-group input,.form-group label{color:#000;color:var(--text-primary)}.form-group input{background-color:#fff;border-bottom:2px solid #fff;border-bottom:2px solid var(--border-light);border-left:2px solid grey;border-left:2px solid var(--border-dark);border-right:2px solid #fff;border-right:2px solid var(--border-light);border-top:2px solid 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