.activity-shell-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:50;-webkit-overflow-scrolling:touch;background-color:#000000eb;justify-content:center;align-items:center;max-width:100vw;display:flex;position:fixed;inset:0;overflow:hidden}.activity-shell{flex-direction:column;width:100%;max-width:100vw;height:100%;display:flex;position:relative;overflow:hidden}.activity-shell .activity-modal{border:none;border-radius:0;flex:1;width:100%;max-width:none;max-height:none;overflow:hidden auto}.activity-shell-header{padding:0 16px;padding-top:env(safe-area-inset-top,0px);z-index:10;background:#ffffff08;border-bottom:1px solid #ffffff0f;flex-shrink:0;align-items:center;min-height:52px;display:flex;position:relative}.activity-shell-header-close{color:#ffffffb3;cursor:pointer;background:#ffffff0d;border:1px solid #ffffff1a;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;transition:all .2s;display:flex}.activity-shell-header-close:hover{color:#fff;background:#ffffff1a}.activity-shell-header-title{color:#fff;flex:1;justify-content:center;align-items:center;gap:8px;margin-right:36px;font-size:15px;font-weight:500;display:flex}.activity-shell-header-icon{opacity:.7;align-items:center;display:flex}.activity-shell-close-mobile,.activity-shell-close-desktop{display:none}@media (min-width:768px){.activity-shell{border:1px solid var(--activity-accent-20,#ffffff1a);width:auto;min-width:340px;max-width:440px;height:auto;max-height:85vh;box-shadow:0 20px 60px #00000080, 0 0 40px var(--activity-accent-glow,#ffffff0d);border-radius:16px;animation:.25s ease-out activity-modal-in;overflow:hidden}.activity-shell .activity-modal{border:none;border-radius:0;flex:1;width:100%;max-width:none;max-height:none;overflow-y:auto}.activity-shell-header{display:none}.activity-shell-close-desktop{border:1px solid var(--activity-accent-30,#ffffff26);color:#ffffffb3;cursor:pointer;z-index:20;background:#0000004d;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;transition:all .2s;display:flex;position:absolute;top:12px;right:12px}.activity-shell-close-desktop:hover{color:#fff;background:#ffffff1a}}.activity-btn-primary{background:var(--primary-accent,#818cf8);color:#fff;cursor:pointer;width:100%;box-shadow:0 4px 20px var(--accent-glow,#818cf866);border:none;border-radius:14px;justify-content:center;align-items:center;gap:6px;padding:14px 24px;font-size:15px;font-weight:600;transition:all .25s;display:flex}.activity-btn-primary:hover:not(:disabled){box-shadow:0 8px 30px var(--accent-glow,#818cf880);transform:translateY(-2px)}.activity-btn-primary:disabled{opacity:.35;color:#fff6;box-shadow:none;cursor:default;background:#ffffff1a}.activity-btn-secondary{color:#ffffffb3;cursor:pointer;background:#ffffff0d;border:1px solid #ffffff1f;border-radius:14px;justify-content:center;align-items:center;gap:6px;width:100%;padding:14px 24px;font-size:15px;font-weight:500;transition:all .25s;display:flex}.activity-btn-secondary:hover{color:#fff;background:#ffffff1a;border-color:#fff3}.activity-btn-secondary-red{color:#fda4af;cursor:pointer;background:#f43f5e1a;border:1px solid #f43f5e59;border-radius:14px;justify-content:center;align-items:center;gap:6px;width:100%;padding:14px 24px;font-size:15px;font-weight:500;transition:all .25s;display:flex}.activity-btn-secondary-red:hover{background:#f43f5e33;border-color:#f43f5e80}.activity-glass-card{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffff0a;border:1px solid #ffffff14;border-radius:16px;transition:border-color .2s}.activity-glass-card:hover{border-color:#ffffff24}.memory-tiles-grid{aspect-ratio:1;box-sizing:border-box;width:100%;max-width:min(360px,100vw - 32px);margin:0 auto}@media (min-width:768px){.memory-tiles-grid{max-width:320px}}.activity-difficulty-card{cursor:pointer;text-align:left;-webkit-user-select:none;user-select:none;background:#ffffff0a;border:1px solid #ffffff14;border-radius:14px;align-items:center;gap:14px;width:100%;padding:18px;transition:all .2s;display:flex}.activity-difficulty-card:hover{background:#ffffff14;border-color:#ffffff29;transform:translateY(-1px)}.activity-difficulty-card.hard-mode{border-color:#f43f5e33}.activity-difficulty-card.hard-mode:hover{background:#f43f5e14;border-color:#f43f5e66}.memory-tile{aspect-ratio:1;box-sizing:border-box;cursor:pointer;background:#ffffff0d;border:2px solid #ffffff14;border-radius:clamp(8px,2.5vw,12px);min-width:0;transition:transform .2s cubic-bezier(.34,1.56,.64,1),background .15s,border-color .15s,box-shadow .15s;box-shadow:0 2px 8px #0003}.memory-tile:disabled{cursor:default}.memory-tile:not(:disabled):hover{border-color:#fff3;transform:scale(1.05)}.word-pill{color:#ffffffd9;letter-spacing:.01em;cursor:pointer;background:#ffffff0d;border:2px solid #ffffff1f;border-radius:20px;padding:12px 20px;font-size:15px;font-weight:500;transition:all .2s}.word-pill:disabled{cursor:default}.word-pill:not(:disabled):hover{border-color:#ffffff40}.word-pill.selected{border-color:var(--primary-accent,#818cf8);color:#fff;box-shadow:0 0 20px var(--accent-glow,#818cf84d);background:#ffffff14}.activity-textarea{resize:vertical;color:#f1f5f9;background-color:#ffffff08;border:1px solid #ffffff1a;border-radius:12px;outline:none;width:100%;min-height:80px;max-height:140px;padding:14px;font-size:15px;line-height:1.6;transition:border-color .2s,box-shadow .2s}.activity-textarea::placeholder{color:#ffffff40}.activity-textarea:focus{border-color:var(--primary-accent,#818cf880);box-shadow:0 0 0 3px var(--accent-glow,#818cf81a)}.activity-btn-secondary-green{color:#4ade80;cursor:pointer;background:#22c55e1a;border:1px solid #22c55e59;border-radius:14px;justify-content:center;align-items:center;gap:6px;padding:14px 24px;font-size:15px;font-weight:500;transition:all .25s;display:flex}.activity-btn-secondary-green:hover{color:#86efac;background:#22c55e2e;border-color:#22c55e99}.activity-hint{color:#ffffff73;background:#ffffff05;border-left:2px solid #ffffff1a;border-radius:0 8px 8px 0;padding:10px 14px;font-size:13px;font-style:italic;line-height:1.5}.activity-warning-banner{color:#fca5a5;background:#ef444414;border:1px solid #ef444426;border-radius:10px;justify-content:space-between;align-items:center;gap:10px;padding:10px 14px;font-size:13px;display:flex}@keyframes activity-modal-in{0%{opacity:0;transform:scale(.95)translateY(8px)}to{opacity:1;transform:scale(1)translateY(0)}}@keyframes activity-float{0%,to{opacity:.3;transform:translateY(0)}50%{opacity:.5;transform:translateY(-6px)}}@keyframes activity-pulse{0%,to{opacity:1}50%{opacity:.7}}@keyframes tile-pop{0%{transform:scale(1)}50%{transform:scale(1.08)}to{transform:scale(1)}}