body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}*{box-sizing:border-box;margin:0;padding:0}:root{--bg-charcoal:#1a1a1d;--bg-flash-red:#ff3b3b;--bg-complete:#1b5e20;--card-bg:#2d2d30;--card-border:#4a4a4f;--text-light:#f0f0f5;--text-gold:gold;--text-muted:#b0b0c0;--border-radius:16px;--box-shadow:0 8px 24px #00000080;--button-width:90px}body{align-items:center;background-color:#1a1a1d;background-color:var(--bg-charcoal);color:#f0f0f5;color:var(--text-light);display:flex;font-family:PingFang TC,Microsoft JhengHei,sans-serif;justify-content:center;min-height:100vh;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}body[data-bg-state=flash]{background-color:#ff3b3b!important;background-color:var(--bg-flash-red)!important}body[data-bg-state=flash-off]{background-color:#1a1a1d!important;background-color:var(--bg-charcoal)!important}body[data-bg-state=complete]{background-color:#1b5e20!important;background-color:var(--bg-complete)!important}.app{align-items:center;display:flex;flex-direction:column;gap:24px;max-width:720px;padding:16px;transition:background-color .2s ease;width:100%}.game-title{display:flex;flex-wrap:wrap;gap:4px;justify-content:center;margin-top:env(safe-area-inset-top,0)}.title-char{animation:float 3s ease-in-out infinite;animation-delay:calc(.1s*var(--i));display:inline-block;font-size:clamp(2.4rem,8vw,3.6rem);font-weight:700;line-height:1.1;text-shadow:0 2px 6px #0003}.title-char:first-child{--i:1}.title-char:nth-child(2){--i:2}.title-char:nth-child(3){--i:3}.title-char:nth-child(4){--i:4}.title-char:nth-child(5){--i:5}.title-char:nth-child(6){--i:6}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.flashcard{background:#2d2d30;background:var(--card-bg);border:2px solid #4a4a4f;border:2px solid var(--card-border);border-radius:16px;border-radius:var(--border-radius);box-shadow:0 8px 24px #00000080;box-shadow:var(--box-shadow);display:flex;flex-direction:column;padding:24px;position:relative;width:100%}.timer-display{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0006;border:2px solid #fff3;border-radius:20px;color:#fff;font-size:1.4rem;min-width:48px;padding:4px 10px;position:absolute;right:16px;top:12px;z-index:10}.card-id,.timer-display{font-weight:700;text-align:center}.card-id{color:#e0e0ff;font-size:clamp(1.8rem,5vw,2.6rem);margin-bottom:0;text-shadow:0 0 8px #b4b4ff33}.card-content{display:flex;flex:1 1;flex-direction:column}.questions-container{display:flex;flex-direction:column;gap:14px;margin:20px 0 30px}.question-row{align-items:flex-start;display:flex;gap:14px;transition:opacity .3s ease}.question-row.dimmed{opacity:.4}.color-button{align-items:center;border:none;border-radius:8px;box-shadow:0 2px 5px #0000004d;color:#fff;cursor:pointer;display:flex;flex-shrink:0;font-size:.95rem;font-weight:700;justify-content:center;line-height:1.3;min-height:48px;padding:12px 8px;text-align:center;transition:transform .15s,opacity .3s;width:90px;width:var(--button-width)}.color-button:focus:not(:disabled),.color-button:hover:not(:disabled){opacity:.95;outline:none;transform:translateY(-2px)}.color-button.dimmed,.color-button:disabled{cursor:not-allowed!important;opacity:.4!important;transform:none!important}.color-button.green{background:#4caf50}.color-button.red{background:#f44336}.color-button.purple{background:#9c27b0}.color-button.brown{background:#8d6e63}.color-button.blue{background:#2196f3}.question-text{align-self:center;color:#f0f0f5;color:var(--text-light);flex:1 1;font-family:monospace;font-size:clamp(1rem,3.8vw,1.3rem);line-height:1.5;word-break:break-word}.navigation{align-items:stretch;display:flex;gap:10px;height:72px;margin-top:auto}.nav-button.wide{align-items:center;border:none;border-radius:12px;box-shadow:0 4px 8px #00000080;cursor:pointer;display:flex;flex:1.5 1;font-size:1.1rem;font-weight:700;justify-content:center;padding:0 12px;transition:opacity .2s}.nav-button.wide.prev{background:#1b5e20;color:#e8f5e9}.nav-button.wide.prev:focus,.nav-button.wide.prev:hover{background:#2e7d32}.nav-button.wide.next{background:#880e0e;color:#ffebee}.nav-button.wide.next:focus,.nav-button.wide.next:hover{background:#b71c1c}.nav-icon{height:28px;width:28px}.jump-container{align-items:stretch;display:flex;flex:1 1;gap:8px}.jump-input{background:#252528;border:2px solid #5a5a68;color:#f0f0f5;color:var(--text-light);flex:1 1;font-size:1.1rem;padding:0 12px;text-align:center;width:90px}.jump-container .nav-button.jump,.jump-input{align-items:center;border-radius:12px;display:flex;height:100%;justify-content:center}.jump-container .nav-button.jump{background:#4a4a55;border:none;box-shadow:0 4px 8px #0006;color:#e0e0ff;cursor:pointer;flex:0 0 auto;font-size:1.05rem;min-width:70px;padding:0 16px}.jump-container .nav-button.jump:hover{background:#5a5a68}.answer-button-container{display:flex;height:72px;justify-content:center;margin-top:auto}.answer-button{background:gold;border:none;border-radius:12px;box-shadow:0 4px 8px #00000080;color:#000;cursor:pointer;font-size:1.4rem;font-weight:700;height:100%;transition:background .2s;width:100%}.answer-button:focus,.answer-button:hover{background:#5a5a68;outline:none}.modal-overlay{align-items:center;background:#000000d9;display:flex;inset:0;justify-content:center;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);position:fixed;z-index:1000}.modal{background:#252528;border:2px solid #5a5a68;border-radius:16px;border-radius:var(--border-radius);box-shadow:0 12px 30px #0009;display:flex;flex-direction:column;max-height:85vh;max-width:600px;overflow:hidden;padding:24px;width:92%}.modal-content{align-items:center;display:flex;flex:1 1;flex-direction:column;justify-content:center;padding:20px;text-align:center}.answer-text{color:gold;color:var(--text-gold);font-size:clamp(1.7rem,5vw,1.7rem);font-weight:500;line-height:1.5;margin-bottom:16px}.teaching-text{color:#f0f0f5;color:var(--text-light);font-size:clamp(1rem,4vw,1.3rem);font-style:italic;line-height:1.6;max-width:90%}.modal-close{align-items:center;background:#4a4a55;border:none;border-radius:12px;box-shadow:0 4px 8px #0006;cursor:pointer;display:flex;height:52px;justify-content:center;margin-top:16px;padding:0;width:100%}.modal-close:hover{background:#5a5a68}.close-icon{color:#f0f0f5;color:var(--text-light);height:26px;width:26px}.loading{color:#b0b0c0;color:var(--text-muted);font-size:1.4rem;text-align:center}@media (max-width:767px) and (orientation:portrait){.app{gap:16px;padding:12px 10px}.title-char{font-size:clamp(2rem,7.5vw,2.8rem)}.flashcard{height:70vh;padding:18px}.timer-display{font-size:1.6rem;padding:6px 12px;right:14px;top:10px}.card-id{font-size:clamp(1.6rem,4.8vw,2.2rem);margin-bottom:0}.card-content{margin-bottom:16px}.questions-container{flex:1 1;gap:16px;margin:12px 0;overflow-y:auto;padding-right:4px}.question-row{gap:12px}.color-button{font-size:.9rem;min-height:44px;padding:10px 6px}.question-text{font-size:clamp(1rem,3.5vw,1.2rem)}.answer-button-container,.navigation{height:68px}.answer-button{font-size:1.3rem}.jump-container .nav-button.jump,.jump-input{font-size:1rem}}@media (min-width:768px){.flashcard{padding:32px}.color-button{font-size:1.25rem;width:100px}.question-text{font-size:1.5rem}.answer-button-container,.navigation{height:80px}.answer-button{font-size:2rem}.jump-input{font-size:1.15rem;width:100px}}input{font-size:1rem}body{transition:background-color .2s ease}
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