*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;min-height:100vh;overflow-x:hidden}body{font-family:SF Pro Display,SF Pro Text,-apple-system,BlinkMacSystemFont,system-ui,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.5;background-color:#fff;color:#1e293b;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{width:100%;max-width:100%;min-height:100vh;display:flex;flex-direction:column;align-items:flex-start}.app-header{position:fixed;top:0;left:0;right:0;height:60px;background-color:#fff;border-bottom:1px solid #e2e8f0;z-index:100;display:flex;align-items:center}.header-content{max-width:1580px;width:100%;margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between}.header-logo{text-decoration:none;color:#1e293b;display:flex;align-items:center;gap:.5rem}.header-logo-text{font-size:1.25rem;font-weight:700;letter-spacing:-.02em}.header-right{display:flex;align-items:center;gap:1rem}.app{width:100%;max-width:1580px;min-height:100vh;margin:0 auto;padding:0 1rem;font-family:SF Pro Display,SF Pro Text,-apple-system,BlinkMacSystemFont,system-ui,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.chess-container{display:flex;justify-content:center;margin-bottom:2rem}.chessboard{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:480px;height:480px;border:1px solid #cbd5e1;border-radius:2px}.square{display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;position:relative}.square:hover{opacity:.8}.square.selected{background-color:#7b61ff!important;opacity:.8}.square.valid-move:before{content:"";position:absolute;width:20px;height:20px;border-radius:50%;background-color:#00ff0080;border:2px solid #00ff00}.piece{font-size:2.5rem;font-weight:700;-webkit-user-select:none;user-select:none;pointer-events:none}.controls{display:flex;flex-direction:column;align-items:center;gap:1rem}.reset-button{background-color:#fff;color:#1e293b;border:1px solid #1e293b;padding:12px 24px;font-size:16px;border-radius:6px;cursor:pointer;font-weight:500;transition:all .2s}.reset-button:hover{background-color:#f8fafc}.ai-controls{display:flex;align-items:center;gap:.5rem;margin:1rem 0}.ai-select{padding:8px 12px;border:1px solid #e2e8f0;border-radius:6px;font-size:14px;background-color:#fff;outline:none}.ai-select:focus{border-color:#3b82f6}.game-info{display:flex;gap:2rem;justify-content:center;margin-top:1rem}.game-info p{margin:0;padding:8px 16px;background-color:#f8fafc;border-radius:6px;font-weight:600;color:#1e293b}.check-warning{color:#ff6b35!important;background-color:#fff3cd!important;border:1px solid #ffeaa7!important}.checkmate-warning{color:#d63031!important;background-color:#ffebee!important;border:1px solid #ffcdd2!important}.draw-warning{color:#6c5ce7!important;background-color:#f3e5f5!important;border:1px solid #e1bee7!important}input[type=checkbox],input[type=radio],input[type=range]{accent-color:#1e293b}