main{width:min(100%,var(--max-width));margin:0 auto;padding:1rem .8rem 2rem}.game-header{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;padding:.8rem 1rem;margin-bottom:1rem;background:var(--bg-card);border:2px solid var(--border-color);border-radius:14px 20px 16px 18px/18px 14px 20px 16px;transition:background-color .3s ease,border-color .3s ease,color .3s ease}.difficulty-selector,.ratio-mode-selector{display:flex;align-items:center;gap:.5rem}.game-header label{font-weight:700}.difficulty-dropdown{appearance:none;-webkit-appearance:none;font-family:inherit;font-size:1.05rem;font-weight:700;color:var(--text-color);background-color:var(--bg-card);border:2px solid var(--border-color);border-radius:10px 14px 11px 13px/13px 10px 14px 11px;padding:.45rem 2rem .45rem .7rem;cursor:pointer;background-image:linear-gradient(45deg,transparent 50%,var(--text-color) 50%),linear-gradient(135deg,var(--text-color) 50%,transparent 50%);background-position:calc(100% - 12px) 50%,calc(100% - 7px) 50%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;transition:background-color .2s ease,border-color .2s ease}.difficulty-dropdown:hover{background-color:var(--bg-card-hover);border-color:var(--purple-primary)}.difficulty-dropdown:focus{outline:none;border-color:var(--purple-primary);box-shadow:2px 2px 0 var(--shadow-color)}.toggle-label{display:inline-flex;align-items:center;gap:.6rem;cursor:pointer;user-select:none}.toggle-label input{position:absolute;opacity:0;pointer-events:none}.toggle-text{display:inline-flex;align-items:center;gap:.55rem;font-weight:700}.toggle-text:before{content:"";width:2.6rem;height:1.4rem;display:inline-block;position:relative;background:var(--bg-card-hover);border:2px solid var(--border-color);border-radius:999px;transition:background-color .2s ease,border-color .2s ease}.toggle-text:after{content:"";position:absolute;width:.85rem;height:.85rem;margin-left:.28rem;background:var(--text-muted);border-radius:50%;transition:transform .2s ease,background-color .2s ease}.toggle-label input:checked+.toggle-text:before{background:var(--purple-primary);border-color:var(--purple-primary)}.toggle-label input:checked+.toggle-text:after{transform:translate(1.15rem);background:#fff}.instructions-inline{flex:1;min-width:220px;color:var(--text-muted);font-size:1rem;font-style:italic}.score-display-header{white-space:nowrap;font-weight:700;font-size:1.15rem;padding:.45rem .8rem;border:2px solid var(--border-color);border-radius:10px 14px 12px 13px/13px 10px 14px 11px;background:var(--bg-card-hover)}#score{color:var(--purple-primary);font-weight:700}.game-container{width:100%;padding:1.5rem;background:var(--bg-card);border:2px solid var(--border-color);border-radius:18px 14px 20px 16px/16px 20px 14px 18px;transition:background-color .3s ease,border-color .3s ease,color .3s ease}.input-fields{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:.8rem;min-height:100px}.input-fields input{width:100%;max-width:180px;padding:.7rem .8rem;font-family:inherit;font-size:1.3rem;font-weight:700;text-align:center;color:var(--text-color);background:var(--bg-color);border:2px solid var(--border-color);border-radius:10px 14px 12px 15px/14px 11px 15px 10px;outline:none;margin:1rem;transition:border-color .2s ease,box-shadow .2s ease,background-color .3s ease}.input-fields input:focus{border-color:var(--purple-primary);box-shadow:3px 3px 0 var(--shadow-color)}.input-fields input::placeholder{color:var(--text-muted);opacity:.7}.game-controls{display:flex;justify-content:center;align-items:center;gap:.8rem;flex-wrap:wrap}.game-controls .btn{min-width:150px}.btn-primary{background-color:var(--purple-primary);color:#fff;border-color:var(--purple-primary)}.btn-primary:hover{background-color:var(--purple-primary)}.btn-secondary{background-color:var(--bg-card);color:var(--text-color);border-color:var(--border-color)}.feedback{margin-top:1.2rem;padding:.8rem 1rem;min-height:0;text-align:center;font-weight:700;border-radius:12px 16px 13px 15px/15px 13px 16px 12px;transition:background-color .2s ease,color .2s ease,border-color .2s ease}.feedback.correct{background-color:color-mix(in srgb,var(--green-base) 15%,var(--bg-card));color:var(--green-base);border:2px solid var(--green-base)}.feedback.incorrect{background-color:color-mix(in srgb,var(--red-base) 15%,var(--bg-card));color:var(--red-base);border:2px solid var(--red-base)}#reaction-info{line-height:1.35}#reaction-info h2,#reaction-info h3{margin-bottom:.7rem;color:var(--purple-primary)}#reaction-info p{margin-bottom:.7rem}#reaction-info ul,#reaction-info ol{margin:.5rem 0 .8rem 1.5rem}#reaction-info code{padding:.15rem .35rem;font-family:monospace;font-size:.9em;background:var(--bg-card-hover);border:1px solid var(--border-color);border-radius:5px}details{margin:1rem 0}details summary{background:var(--bg-card);border:2px solid var(--border-color);border-radius:12px 18px 14px 20px/18px 14px 20px 12px;box-shadow:3px 4px 0 var(--shadow-color);padding:.8rem;color:var(--text-color);font-weight:700;position:relative;z-index:2;display:flex;justify-content:space-between;align-items:center;list-style:none;cursor:pointer}details summary::-webkit-details-marker{display:none}details summary:after{content:"";width:1.2rem;height:1.2rem;background-color:var(--text-color);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center / contain;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center / contain;transition:transform .3s ease}details[open] summary:after{transform:rotate(90deg)}details summary:hover{transform:translate(1px,2px);box-shadow:2px 2px 0 var(--shadow-color);background-color:var(--bg-card-hover)}details>.details-content{padding:.5rem .8rem;border-inline:2px dashed var(--border-color);position:relative;z-index:1}details>.details-content:first-of-type{margin-top:-2px;padding-top:.6rem}details>.details-content:last-of-type{padding-bottom:.6rem;border-bottom:2px dashed var(--border-color);border-radius:0 0 14px 20px/0 0 20px 12px}details p{margin-bottom:0}@media(max-width:750px){.game-header{align-items:stretch;flex-direction:column;gap:.8rem}.difficulty-selector,.ratio-mode-selector{width:100%}.difficulty-dropdown{flex:1}.instructions-inline{min-width:0}.score-display-header{text-align:center}.game-container{padding:1rem}}@media(max-width:450px){main{padding-left:.6rem;padding-right:.6rem}.game-header,.game-container,.theory-container{padding:.9rem}.game-controls{flex-direction:column}.game-controls .btn{width:100%}.input-fields input{max-width:100%}}.video-container{width:100%;display:flex;justify-content:center;margin:1.5rem 0}.video-container iframe{display:block;width:min(100%,600px);aspect-ratio:16 / 9;height:auto;border:2px solid var(--border-color);border-radius:14px 18px 16px 20px/18px 14px 20px 16px}