:root{--background-color: #f0f8ff;--text-color: #333;--heading-color: #1e3a8a;--button-bg: #3b82f6;--button-hover-bg: #2563eb;--button-disabled-bg: #9ca3af;--input-border: #ccc;--cell-bg: #93c5fd;--cell-border: #3b82f6;--cell-hover-bg: #60a5fa;--ship-bg: #6b7280;--hit-bg: #ef4444;--miss-bg: #d1d5db;--sunk-bg: #7f1d1d;--game-info-bg: #e0f2fe;--game-info-border: #3b82f6;--notification-bg: #3b82f6;--notification-color: white;--box-shadow: rgba(0, 0, 0, .1);--panel-bg: white}[data-theme=dark]{--background-color: #0f172a;--text-color: #e5e7eb;--heading-color: #93c5fd;--button-bg: #60a5fa;--button-hover-bg: #3b82f6;--button-disabled-bg: #4b5563;--input-border: #4b5563;--cell-bg: #172554;--cell-border: #1d4ed8;--cell-hover-bg: #2563eb;--ship-bg: #94a3b8;--hit-bg: #ef4444;--miss-bg: #475569;--sunk-bg: #b91c1c;--game-info-bg: #1e293b;--game-info-border: #60a5fa;--notification-bg: #1d4ed8;--notification-color: white;--box-shadow: rgba(0, 0, 0, .3);--panel-bg: #1e293b}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Arial,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;transition:background-color .3s,color .3s}.container{max-width:1200px;margin:0 auto;padding:20px}h1,h2,h3{margin-bottom:20px;color:var(--heading-color);transition:color .3s}button{padding:10px 15px;background-color:var(--button-bg);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:1rem;transition:background-color .3s}button:hover{background-color:var(--button-hover-bg)}button:disabled{background-color:var(--button-disabled-bg);cursor:not-allowed}input{padding:10px;margin-bottom:15px;border:1px solid var(--input-border);border-radius:4px;font-size:1rem;width:100%;background-color:var(--panel-bg);color:var(--text-color);transition:border-color .3s,background-color .3s,color .3s}.game-board{display:grid;grid-template-columns:repeat(10,40px);grid-template-rows:repeat(10,40px);gap:2px;margin:20px 0}.cell{width:40px;height:40px;background-color:var(--cell-bg);border:1px solid var(--cell-border);display:flex;align-items:center;justify-content:center;font-weight:700;cursor:pointer;transition:background-color .2s,border-color .3s}.cell:hover{background-color:var(--cell-hover-bg)}.cell.ship{background-color:var(--ship-bg)}.cell.hit{background-color:var(--hit-bg);color:#fff}.cell.miss{background-color:var(--miss-bg)}.cell.sunk{background-color:var(--sunk-bg);color:#fff}.game-info{margin:20px 0;padding:15px;background-color:var(--game-info-bg);border-radius:5px;border-left:5px solid var(--game-info-border);transition:background-color .3s,border-color .3s}.opponent-board .cell:not(.hit):not(.miss):not(.sunk){cursor:crosshair}.notification{position:fixed;bottom:20px;right:20px;padding:15px 20px;background-color:var(--notification-bg);color:var(--notification-color);border-radius:5px;box-shadow:0 4px 6px var(--box-shadow);z-index:1000;animation:slideIn .3s ease-out forwards;transition:background-color .3s,color .3s}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.game-setup{display:flex;flex-direction:column;align-items:center;max-width:500px;margin:0 auto;padding:20px;background-color:var(--panel-bg);border-radius:8px;box-shadow:0 4px 6px var(--box-shadow);transition:background-color .3s,box-shadow .3s}.game-container{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap}.board-container{flex:1;min-width:300px}.ships-container{display:flex;flex-direction:column;gap:10px;margin-bottom:20px}@media (max-width: 768px){.game-container{flex-direction:column}.game-board{grid-template-columns:repeat(10,30px);grid-template-rows:repeat(10,30px)}.cell{width:30px;height:30px}}