*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f1117;--surface: #1a1d27;--surface2: #252836;--border: #2e3347;--fog: rgba(30, 34, 50, .92);--text: #e8eaf2;--text-muted: #7a7f9a;--accent: #5b7cff;--accent-hover: #7b96ff;--danger: #e05555;--success: #4caf82;--black-piece: #1a1a1a;--white-piece: #f0f0f0;--cell-size: min(11vw, 72px);--board-gap: 2px}html,body{height:100%;background:var(--bg);color:var(--text);font-family:Hiragino Sans,Noto Sans JP,sans-serif;-webkit-font-smoothing:antialiased}#app{height:100%}.screen{display:none;position:fixed;inset:0;overflow-y:auto}.screen.active{display:flex;flex-direction:column}.top-content{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:2rem;gap:1.5rem}.title{font-size:clamp(2.5rem,8vw,5rem);font-weight:900;text-align:center;line-height:1}.title-fog{color:var(--accent)}.title-sub{display:block;font-size:.3em;font-weight:400;color:var(--text-muted);letter-spacing:.1em;margin-top:.5em}.tagline{color:var(--text-muted);font-size:1rem;letter-spacing:.05em}.top-buttons{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}.join-form{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center}.join-form input{background:var(--surface2);border:1px solid var(--border);color:var(--text);padding:.6rem 1rem;border-radius:8px;font-size:1.1rem;letter-spacing:.15em;text-transform:uppercase;width:180px;text-align:center}.join-form input:focus{outline:2px solid var(--accent)}.btn{padding:.7rem 1.8rem;border-radius:10px;border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s;font-family:inherit}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--accent)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{opacity:.85}.btn-link{background:none;color:var(--text-muted);text-decoration:underline;padding:.3rem}.btn-link:hover{color:var(--text)}.btn-small{padding:.4rem .9rem;font-size:.85rem}.error-msg{color:var(--danger);font-size:.9rem}.hidden{display:none!important}.waiting-content{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:1.5rem;padding:2rem;text-align:center}.waiting-content h2{font-size:1.3rem;color:var(--text-muted)}.room-id-display{display:flex;flex-direction:column;gap:.3rem}.label{font-size:.8rem;color:var(--text-muted);letter-spacing:.1em}.room-id-big{font-size:3rem;font-weight:900;letter-spacing:.25em;color:var(--accent);font-variant-numeric:tabular-nums}.share-url-box{display:flex;align-items:center;gap:.5rem;background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:.5rem .8rem;max-width:100%}.share-url{font-size:.8rem;color:var(--text-muted);word-break:break-all}.waiting-spinner{display:flex;align-items:center;justify-content:center;padding:1rem}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.game-header{display:flex;align-items:center;justify-content:space-between;padding:.6rem 1rem;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0}.player-info,.opponent-info{display:flex;align-items:center;gap:.5rem}.color-label{font-size:.9rem;color:var(--text-muted)}.score{font-size:1.4rem;font-weight:700}.score-label{font-size:.9rem;color:var(--text-muted)}.turn-indicator{font-size:.85rem;font-weight:600;padding:.3rem .7rem;border-radius:20px;background:var(--surface2);color:var(--text-muted);transition:all .3s}.turn-indicator.my-turn{background:var(--accent);color:#fff;box-shadow:0 0 12px #5b7cff66}.game-main{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem;position:relative;min-height:0}#board-canvas,#final-canvas{max-width:min(90vw,90vh - 120px);max-height:min(90vw,90vh - 120px);width:calc(var(--cell-size) * 8 + var(--board-gap) * 9);height:calc(var(--cell-size) * 8 + var(--board-gap) * 9);border-radius:4px;cursor:pointer;display:block}.pass-notice{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#000000d9;color:var(--text);padding:1rem 2rem;border-radius:12px;font-size:1.1rem;font-weight:600;pointer-events:none;animation:fadeInOut 2s ease forwards}@keyframes fadeInOut{0%{opacity:0;transform:translate(-50%,-60%)}20%{opacity:1;transform:translate(-50%,-50%)}70%{opacity:1}to{opacity:0}}.game-footer{display:flex;align-items:center;justify-content:space-between;padding:.6rem 1rem;background:var(--surface);border-top:1px solid var(--border);flex-shrink:0}.connection-status{font-size:.8rem}.connection-status.connected{color:var(--success)}.connection-status.disconnected{color:var(--danger)}.end-content{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:1rem;gap:1.5rem}.result-panel{text-align:center;display:flex;flex-direction:column;gap:1.2rem;align-items:center}.result-title{font-size:2rem;font-weight:900}.result-title.win{color:var(--success)}.result-title.lose{color:var(--danger)}.result-title.draw{color:var(--text-muted)}.final-score{display:flex;gap:2rem;align-items:center}.score-item{display:flex;align-items:center;gap:.5rem;font-size:1.2rem}.score-num{font-size:2rem;font-weight:700}.piece-black{color:#666;font-size:1.5rem}.piece-white{color:#ccc;font-size:1.5rem}.end-buttons{display:flex;gap:1rem}.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:1rem}.modal.hidden{display:none}.modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:blur(4px)}.modal-content{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:2rem;max-width:480px;width:100%;max-height:80vh;overflow-y:auto;display:flex;flex-direction:column;gap:1.2rem;z-index:1}.modal-small{max-width:320px}.modal-content h2{font-size:1.4rem}.modal-content h3{font-size:1rem;color:var(--accent)}.modal-content p,.modal-content li{font-size:.9rem;line-height:1.7;color:var(--text-muted)}.modal-content ul{padding-left:1.2rem}.modal-close{position:absolute;top:1rem;right:1rem;background:none;border:none;color:var(--text-muted);font-size:1.2rem;cursor:pointer}.modal-close-btn{align-self:center}.modal-buttons{display:flex;gap:.8rem;justify-content:center}@media (max-width: 480px){.game-header{padding:.4rem .6rem}.score{font-size:1.2rem}.game-footer{padding:.4rem .6rem}.top-buttons{flex-direction:column;align-items:center}}