:root{--font-body: "Noto Sans", "Segoe UI", sans-serif;--font-display: "Cormorant Garamond", Georgia, "Times New Roman", serif;--paper-canvas: #f7f2e8;--paper-line: rgba(123, 87, 48, .22);--paper-line-strong: rgba(123, 87, 48, .34);--paper-pine: #4d6b3d;--paper-leather: #7b5730;--action: linear-gradient(180deg, #5c7f49, #46612f);--action-hover: linear-gradient(180deg, #678c52, #4e6c35);--action-line: #3d5730;--background: #f7f2e8;--card-background: #fffcf3;--primary-color: var(--paper-pine);--secondary-color: var(--paper-leather);--text-primary: #2e261c;--text-secondary: #5e5a50;--border-color: var(--paper-line);--border-strong: var(--paper-line-strong);--correct-ring: #82c144;--correct-glyph: #3e7849;--error-color: #96392f;--error-surface: rgba(150, 57, 47, .08);--error-line: rgba(150, 57, 47, .28);--gold-color: #8a5709;--shadow-sm: 0 6px 16px rgba(46, 38, 28, .08);--shadow-md: 0 10px 24px rgba(46, 38, 28, 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ease}.tts-button:hover:not(:disabled){background:var(--action);border-color:var(--action-line);color:#fffcf3}.tts-button:focus-visible{outline:none;box-shadow:0 0 0 3px #4d6b3d4d}.tts-button--loading{opacity:.4;cursor:not-allowed}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.9rem;width:100%;max-width:620px;margin:0 auto}.option-card{perspective:1000px;cursor:pointer;height:220px;position:relative;transition:opacity .3s ease,transform .3s ease}.card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.option-card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm)}.card-front{background-color:var(--card-background);border:1px solid var(--border-color)}.card-img{width:100%;flex:1;min-height:0;object-fit:cover}.card-label{padding:.45rem .75rem;font-size:clamp(1rem,2.4vh,1.75rem);font-weight:700;text-align:center;word-wrap:break-word;flex-shrink:0}.sense-gloss{display:block;margin-top:.2rem;color:var(--text-secondary);font-size:.62em;font-weight:500;line-height:1.25}.card-back{background-color:var(--card-background);border:1px solid var(--border-color);transform:rotateY(180deg)}.card-back .card-img{opacity:.25}.card-text{font-size:clamp(1rem,2.4vh,1.75rem);font-weight:700;text-align:center;word-wrap:break-word;padding:1rem;color:var(--text-primary)}.option-card:hover:not(.greyed-out) .card-front{border-color:var(--paper-leather);box-shadow:var(--shadow-md)}.option-card.greyed-out{opacity:.35;pointer-events:none}@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.12)}to{transform:scale(1)}}@keyframes checkmark-in{0%{opacity:0;transform:translate(-50%,-50%) scale(.4)}60%{opacity:1;transform:translate(-50%,-50%) 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var(--border-color)}.summary-item-img{width:48px;height:48px;object-fit:cover;border-radius:6px;flex-shrink:0}.summary-item-words{display:flex;flex-direction:column;flex:1;min-width:0}.summary-item-foreign{font-size:1rem;font-weight:700;color:var(--primary-color);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.summary-item-english{font-size:.875rem;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.summary-item-stars{font-size:1.25rem;color:var(--gold-color);flex-shrink:0;letter-spacing:.05em}@media (max-width: 640px){.game-card{padding:1.5rem}.game-card h1{font-size:1.75rem}.game-actions{flex-direction:column}.game-actions .btn{width:100%}.game-container.quiz-playing{padding:.5rem;gap:.4rem}.quiz-playing .foreign-word{font-size:clamp(2rem,9vw,3.2rem);margin-bottom:.25rem;line-height:1.05}.quiz-playing .transliteration{font-size:.9rem}.quiz-playing .tts-button{padding:.25rem .7rem;font-size:.85rem}.quiz-playing 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