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var(--border);background:var(--bg-card);width:38px;height:38px;color:var(--text-primary);cursor:pointer;border-radius:4px;margin:0 auto;font-size:16px;font-weight:700;transition:all .15s}.blank-letter-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.loading-screen{flex-direction:column;justify-content:center;align-items:center;gap:16px;min-height:100dvh;display:flex}.loading-spinner{border:3px solid var(--border);border-top:3px solid var(--accent);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=900px){.game-layout{flex-direction:column;gap:8px;padding:8px}.game-sidebar-left{flex-direction:row;width:100%;overflow-x:auto}.game-sidebar-right{flex-direction:row;justify-content:center;width:100%}.scoreboard{min-width:200px}.move-history{min-width:200px;max-height:150px}}@media (width<=700px){.game-layout{flex-direction:column;gap:0;height:100svh;min-height:auto;padding:0}.game-sidebar-left{flex-direction:row;flex-shrink:0;align-items:flex-start;gap:4px;width:100%;padding:4px 8px;overflow:hidden}.game-sidebar-right{display:none}.mobile-menu-btn{flex-shrink:0;align-self:center}.scoreboard{border-radius:6px;width:100%;min-width:0;padding:6px 10px;position:relative}.scoreboard-title{display:none}.scoreboard-player{margin-bottom:0;padding:2px 6px}.player-name{font-size:12px}.player-score{font-size:16px}.scoreboard-info{margin-top:4px;padding-top:4px;font-size:10px}.last-move,.move-history{display:none}.game-main{flex:1;justify-content:flex-start;gap:4px;min-height:0;padding:0 2px;overflow:hidden}.game-controls{padding:4px 4px env(safe-area-inset-bottom,4px);flex-shrink:0}.controls-row{gap:4px}.btn{padding:8px 10px;font-size:11px}.exchange-hint{margin-top:2px;font-size:11px}.game-over-banner{margin-top:8px;padding:10px}.game-over-banner h3{font-size:14px}.ai-thinking{margin-top:4px;padding:4px 8px;font-size:12px}}