.main-menu-wrapper{width:100%;max-width:28rem}.main-menu-card{background-color:#fff;border-radius:1.5rem;box-shadow:0 25px 50px -12px #00000040;padding:2rem}.menu-content{display:flex;flex-direction:column;gap:1.5rem;text-align:center}.menu-title{font-size:2.25rem;font-weight:700;color:#1f2937;margin-bottom:.5rem}.menu-subtitle{color:#4b5563}.menu-items{display:flex;flex-direction:column;gap:.75rem}.menu-button{display:flex;align-items:center;justify-content:center;gap:.75rem;padding:1rem 1.5rem;background-color:#059669;color:#fff;border-radius:.75rem;font-weight:600;box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d;transition:all .15s ease-in-out;cursor:pointer}.menu-button:hover{background-color:#047857;transform:scale(1.05)}.menu-button:active{transform:scale(.95)}.about-page-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;background:linear-gradient(to bottom right,#064e3b,#065f46,#047857)}.about-page-content{width:100%;max-width:42rem}.about-card{background-color:#fff;border-radius:1.5rem;box-shadow:0 25px 50px -12px #00000040;padding:2rem}.about-title{font-size:1.875rem;font-weight:700;color:#1f2937;margin-bottom:1rem}.about-text-content{display:flex;flex-direction:column;gap:1rem;color:#374151;line-height:1.625}.about-text-content p{margin:0}.tip-box{background-color:#f0fff4;border-left:4px solid #059669;padding:1rem;border-radius:.25rem}.tip-header{font-weight:600;color:#064e3b}.tip-body{color:#065f46}.back-button{margin-top:1.5rem;width:100%;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;background-color:#059669;color:#fff;border-radius:.75rem;font-weight:600;box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d;transition:background-color .15s ease-in-out;cursor:pointer}.back-button:hover{background-color:#047857}.game-mode-wrapper{width:100%;max-width:28rem}.game-mode-card{background-color:#fff;border-radius:1.5rem;box-shadow:0 25px 50px -12px #00000040;padding:2rem}.mode-title{font-size:1.875rem;font-weight:700;color:#1f2937;margin-bottom:1.5rem;text-align:center}.mode-list{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem}.mode-button{position:relative;overflow:hidden;border-radius:.75rem;padding:1.5rem;color:#fff;box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d;transition:all .15s ease-in-out;cursor:pointer;border:none;text-align:left}.mode-button:hover{box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a;transform:scale(1.05)}.mode-button:active{transform:scale(.95)}.mode-button-gradient{position:absolute;inset:0;z-index:0}.mode-color-blue{background:linear-gradient(to right,#047857,#065f46)}.mode-color-purple{background:linear-gradient(to right,#84cc16,#65a30d)}.mode-content-inner{position:relative;z-index:1;display:flex;align-items:center;gap:1rem}.mode-icon-container{background-color:#fff3;padding:.75rem;border-radius:.5rem}.mode-text-content{text-align:left}.mode-label{font-weight:700;font-size:1.125rem}.mode-description{font-size:.875rem;color:#ffffffe6}.back-button{width:100%;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;background-color:#e5e7eb;color:#1f2937;border-radius:.75rem;font-weight:600;transition:background-color .15s ease-in-out;cursor:pointer;border:none}.back-button:hover{background-color:#d1d5db}.reversi-game-page-wrapper{width:100%;max-width:44rem;margin:0 auto}.invalid-move{animation:shake .5s}@keyframes shake{0%{transform:translate(0)}25%{transform:translate(-5px)}50%{transform:translate(5px)}75%{transform:translate(-5px)}to{transform:translate(0)}}.invalid-move-message{position:absolute;top:1rem;left:50%;transform:translate(-50%);z-index:10;margin:0 0 1.5rem;padding:1rem;background-color:#fee;border:2px solid #ef4444;border-radius:.75rem;text-align:center;font-weight:600;color:#991b1b}.reversi-game-content{position:relative}.reversi-game-content{background-color:#fff;border-radius:1rem;box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a;padding:2rem}.game-header{margin-bottom:1.5rem}.game-header h2{font-size:1.5rem;font-weight:700;color:#1f2937;margin-bottom:.5rem}.score-wrap{display:flex;gap:1.5rem}.player-score{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;border-radius:.5rem;background-color:#f3f4f6;transition:all .2s}.player-score .player-name{font-weight:600}.player-score.current-player{background-color:#1f2937;color:#fff}.player-score.current-player .disc-icon.disc-white{border-color:#1f2937}.disc-icon{width:1rem;height:1rem;border-radius:50%;border-width:2px}.disc-icon.disc-black{background-color:#000;border-color:#9ca3af}.disc-icon.disc-white{background-color:#fff;border-color:#9ca3af}.board-wrap{display:flex;justify-content:center;margin-bottom:1.5rem}.reversi-board{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;background-color:#14532d;padding:8px;border-radius:.5rem;box-shadow:0 10px 15px -3px #0000001a}.reversi-cell{width:64px;height:64px;background-color:#27ae60;border:2px solid #1e8449;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color .2s ease}.reversi-cell:hover{background-color:#34c478}.valid-move-highlight{box-shadow:0 0 0 3px #facc15}.disc{width:85%;height:85%;border-radius:50%;box-shadow:0 10px 15px -3px #0000001a;transition:all .2s ease;transform:scale(1);animation:flipDisc .6s ease}.disc:hover{transform:scale(1.05)}@keyframes flipDisc{0%{transform:rotateY(0) scale(1)}50%{transform:rotateY(90deg) scale(.8)}to{transform:rotateY(180deg) scale(1)}}.disc-black{background-color:#1f2937;border:2px solid #374151}.disc-white{background-color:#fff;border:2px solid #e5e7eb}.valid-move-indicator{width:1rem;height:1rem;border-radius:50%;background-color:#facc15;opacity:.7;animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}@keyframes pulse{0%,to{opacity:.7}50%{opacity:1}}.winner-popup{margin-bottom:1.5rem;padding:1rem;background-color:#f0fff4;border:2px solid #34c758;border-radius:.75rem;text-align:center}.winner-popup .winner-text{font-size:1.25rem;font-weight:700;color:#1f2937}.winner-popup .final-score{color:#374151;margin-top:.25rem}.game-end-overlay{position:fixed;inset:0;background-color:#000000bf;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.game-end-modal{background:#fff;border-radius:1.5rem;padding:3rem 2rem;max-width:32rem;width:100%;box-shadow:0 25px 50px -12px #0006;text-align:center;position:relative;overflow:hidden}.game-end-modal:before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:linear-gradient(to right,#059669,#34d399)}.trophy-container{margin:0 auto 1.5rem;display:flex;justify-content:center}.trophy-container .trophy-icon{filter:drop-shadow(0 10px 20px rgba(0,0,0,.15))}.trophy-container .trophy-icon.winner{color:#f59e0b;animation:trophy-shine 2s ease-in-out infinite}.trophy-container .trophy-icon.draw{color:#6b7280}@keyframes trophy-shine{0%,to{filter:drop-shadow(0 10px 20px rgba(245,158,11,.3))}50%{filter:drop-shadow(0 10px 30px rgba(245,158,11,.6))}}.game-end-title{font-size:2.5rem;font-weight:700;color:#1f2937;margin:0 0 .5rem;background:linear-gradient(to right,#059669,#34d399);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.winner-name{font-size:1.5rem;font-weight:600;color:#374151;margin:0 0 2rem}.final-scores{display:flex;align-items:center;justify-content:center;gap:1.5rem;margin:2rem 0;padding:1.5rem;background:linear-gradient(to bottom,#f9fafb,#f3f4f6);border-radius:1rem}.score-card{flex:1}.player-info{display:flex;flex-direction:column;align-items:center;gap:.75rem;padding:1rem;border-radius:.75rem;transition:all .3s ease}.player-info.winner-highlight{background:linear-gradient(135deg,#ecfdf5,#d1fae5);box-shadow:0 0 0 3px #34d399;transform:scale(1.05)}.player-info.winner-highlight .score-value{color:#059669;font-weight:700}.disc-icon{width:3rem;height:3rem;border-radius:50%;border-width:3px;box-shadow:0 4px 6px #0000001a}.disc-icon.disc-black{background-color:#1f2937;border-color:#374151}.disc-icon.disc-white{background-color:#fff;border-color:#d1d5db}.player-label{font-size:.875rem;font-weight:600;color:#6b7280;margin:0;text-transform:uppercase;letter-spacing:.05em}.score-value{font-size:2rem;font-weight:700;color:#1f2937;margin:0}.score-divider{font-size:1.25rem;font-weight:700;color:#9ca3af;padding:0 1rem}.score-difference{font-size:1rem;color:#6b7280;margin:0 0 2rem;font-style:italic}.action-buttons{display:flex;gap:1rem;flex-direction:column}@media(min-width:640px){.action-buttons{flex-direction:row}}.action-button{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem 1.5rem;border-radius:.75rem;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 6px #0000001a}.action-button:active{transform:scale(.95)}.action-button.primary{background:linear-gradient(135deg,#059669,#047857);color:#fff}.action-button.primary:hover{background:linear-gradient(135deg,#047857,#065f46);box-shadow:0 6px 12px #0596694d}.action-button.secondary{background:#fff;color:#1f2937;border:2px solid #e5e7eb}.action-button.secondary:hover{background:#f9fafb;border-color:#d1d5db;box-shadow:0 6px 12px #0000001a}@media(max-width:640px){.game-end-modal{padding:2rem 1.5rem}.game-end-title{font-size:2rem}.winner-name{font-size:1.25rem}.final-scores{flex-direction:column;gap:1rem}.score-divider{transform:rotate(90deg)}}.app-main-layout{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;background:linear-gradient(to bottom right,#064e3b,#065f46,#047857)}