.enhanced-flashcards{max-width:800px;margin:0 auto;padding:20px;font-family:system-ui,-apple-system,sans-serif}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:15px;border-bottom:2px solid #e2e8f0}.header h2{margin:0;color:#2d3748;font-size:1.5rem}.stats{color:#4a5568;font-weight:500;font-size:.9rem}.tabs{display:flex;gap:0;margin-bottom:20px;border-bottom:1px solid #e2e8f0}.tab-button{flex:1;padding:12px 24px;background:#f7fafc;border:1px solid #e2e8f0;border-bottom:none;cursor:pointer;font-weight:500;font-size:.95rem;color:#4a5568;transition:all .2s ease;position:relative}.tab-button:hover{background:#edf2f7;color:#2d3748}.tab-button.active{background:#fff;color:#4299e1;border-bottom:2px solid #4299e1}.tab-button:first-child{border-top-left-radius:8px;border-right:none}.tab-button:last-child{border-top-right-radius:8px;border-left:none}.settings{display:flex;gap:20px;justify-content:center;margin-bottom:20px;padding:15px;background:#f7fafc;border-radius:8px;border:1px solid #e2e8f0}.setting{display:flex;align-items:center;gap:8px;cursor:pointer;color:#4a5568;font-weight:500;font-size:.9rem}.setting input[type=checkbox]{accent-color:#4299e1}.setting input[type=checkbox]:disabled{opacity:.5}.setting span{user-select:none}.card-container{margin-bottom:20px;perspective:1000px;display:flex;justify-content:center}.flip-card{width:100%;max-width:700px;height:650px;cursor:pointer;position:relative;transform-style:preserve-3d;transition:transform .6s}.flip-card.flipped{transform:rotateY(180deg)}.card-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:12px;box-shadow:0 4px 12px #0000001a;background:#fff;display:flex;flex-direction:column;padding:30px}.card-front{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;justify-content:center;align-items:center;text-align:center}.card-back{transform:rotateY(180deg);background:#fff;overflow-y:auto}.card-front .hanzi{font-size:8rem;font-weight:300;margin:20px 0;text-shadow:0 2px 4px rgba(0,0,0,.3);font-family:Noto Sans CJK SC,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}.card-front .copy-btn,.card-front .audio-btn{position:absolute;top:20px;background:#fff3;border:none;border-radius:20px;width:36px;height:36px;cursor:pointer;font-size:1rem;transition:all .2s ease;backdrop-filter:blur(10px)}.card-front .copy-btn{right:20px}.card-front .audio-btn{right:70px}.card-front .copy-btn:hover,.card-front .audio-btn:hover{background:#ffffff4d;transform:scale(1.1)}.character-header{display:flex;align-items:center;gap:20px;margin-bottom:20px;padding-bottom:15px;border-bottom:2px solid #e2e8f0}.hanzi-small{font-size:3rem;font-weight:300;color:#2d3748;font-family:Noto Sans CJK SC,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;display:flex;align-items:center;gap:15px}.hanzi-copy-btn,.hanzi-tts-btn{background:#48bb78;border:none;border-radius:20px;width:32px;height:32px;cursor:pointer;font-size:.8rem;transition:all .2s ease;flex-shrink:0;display:flex;align-items:center;justify-content:center}.hanzi-copy-btn:hover,.hanzi-tts-btn:hover{transform:scale(1.1);background:#38a169}.hanzi-copy-btn{background:#4299e1}.hanzi-copy-btn:hover{background:#3182ce}.meta{display:flex;flex-direction:column;gap:5px}.pinyin{font-size:1.4rem;color:#4299e1;font-weight:600}.meaning{font-size:1.2rem;color:#4a5568;font-weight:500}.content-sections{flex:1;display:flex;flex-direction:column;gap:15px;margin-bottom:15px}.history-section,.examples-section,.mnemonic-section{background:#f8fafc;padding:12px;border-radius:6px;border-left:4px solid #4299e1}.history-section h3,.examples-section h3,.mnemonic-section h3{color:#2d3748;font-size:1rem;margin:0 0 10px;display:flex;align-items:center;gap:8px;font-weight:600}.history-section p,.mnemonic-description{line-height:1.5;color:#4a5568;font-size:.9rem;margin:0;font-style:italic}.mnemonic-image{text-align:center;margin:10px 0}.mnemonic-image img{max-width:100%;max-height:200px;border-radius:6px;box-shadow:0 2px 6px #0000001a}.mnemonic-placeholder{text-align:center;padding:40px 20px;background:#f7fafc;border:2px dashed #cbd5e0;border-radius:6px;color:#a0aec0;font-size:.9rem;margin:10px 0}.examples-section ul{list-style:none;padding:0;margin:10px 0 0}.example-item{display:flex;align-items:flex-start;gap:8px;padding:6px 0}.example-audio{background:#48bb78;border:none;border-radius:12px;width:24px;height:24px;cursor:pointer;font-size:.7rem;transition:all .2s ease;flex-shrink:0}.example-audio:hover{transform:scale(1.1);background:#38a169}.example-text{line-height:1.4;color:#4a5568;font-size:.85rem}.instruction{text-align:center;font-size:.9rem;margin-top:auto;padding-top:15px}.card-front .instruction{color:#fffc}.card-back .instruction{color:#a0aec0}.controls{display:flex;gap:10px;justify-content:center;margin-bottom:15px}.controls button{padding:10px 20px;border:1px solid #e2e8f0;background:#fff;color:#4a5568;border-radius:6px;cursor:pointer;font-weight:500;transition:all .2s ease}.controls button:hover:not(:disabled){background:#f7fafc;border-color:#cbd5e0}.controls button:disabled{opacity:.5;cursor:not-allowed}.keyboard-shortcuts{margin-top:30px;padding:20px;background:#f8fafc;border-radius:12px;border:1px solid #e2e8f0}.keyboard-shortcuts h3{margin:0 0 15px;color:#2d3748;font-size:1.1rem;text-align:center}.shortcuts-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px}.shortcut-item{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;background:#fff;border-radius:6px;border:1px solid #e2e8f0}.shortcut-item kbd{background:#2d3748;color:#fff;border:1px solid #4a5568;border-radius:4px;padding:4px 8px;font-family:monospace;font-size:.8rem;font-weight:600;min-width:32px;text-align:center;box-shadow:0 1px 2px #0000001a}.shortcut-item span{color:#4a5568;font-size:.9rem;font-weight:500}.no-data{text-align:center;padding:60px 20px;color:#4a5568}.no-data h2{margin-bottom:20px;color:#2d3748}.no-data p{margin-bottom:10px;line-height:1.5}@media (min-width: 1024px){.enhanced-flashcards{max-width:1200px}.flip-card{max-width:1000px;height:700px}.card-back{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto 1fr auto;gap:30px;padding:40px}.character-header{grid-column:1 / -1;margin-bottom:0}.card-back-left{display:flex;flex-direction:column;justify-content:center;align-items:center}.card-back-right{display:flex;flex-direction:column;gap:20px}.mnemonic-image{margin:0}.mnemonic-image img{max-width:100%;max-height:400px;width:auto;height:auto}.mnemonic-placeholder{width:100%;height:300px;display:flex;align-items:center;justify-content:center;margin:0}.card-back .instruction{grid-column:1 / -1;margin-top:0;padding-top:0}}.shuffle-section{margin-top:30px;text-align:center}.shuffle-button{display:inline-flex;align-items:center;gap:12px;padding:16px 32px;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:50px;color:#fff;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea4d;text-transform:uppercase;letter-spacing:.5px}.shuffle-button:hover{transform:translateY(-2px);box-shadow:0 8px 25px #667eea66;background:linear-gradient(135deg,#5a6fd8,#6a4190)}.shuffle-button:active{transform:translateY(0);box-shadow:0 2px 10px #667eea4d}.shuffle-icon{font-size:1.5rem;animation:shuffle-spin 2s ease-in-out infinite}.shuffle-text{font-weight:700}.card-count{font-size:.9rem;opacity:.9;font-weight:500}@keyframes shuffle-spin{0%,to{transform:rotate(0)}25%{transform:rotate(-5deg)}75%{transform:rotate(5deg)}}@media (max-width: 768px){.enhanced-flashcards{padding:15px}.flip-card{height:550px}.card-front .hanzi{font-size:5rem}.hanzi-small{font-size:2rem}.character-header{flex-direction:column;text-align:center;gap:10px}.card-front,.card-back{padding:20px}.content-sections{gap:15px}.history-section,.examples-section,.mnemonic-section{padding:12px}.mnemonic-image img{max-height:120px}.settings{flex-direction:column;gap:10px}.hanzi-small{font-size:2rem;gap:10px}.hanzi-copy-btn,.hanzi-tts-btn{width:28px;height:28px;font-size:.7rem}.shortcuts-grid{grid-template-columns:1fr}.keyboard-shortcuts{margin-top:20px;padding:15px}.shuffle-section{margin-top:20px}.shuffle-button{padding:14px 24px;font-size:1rem;gap:8px}.shuffle-icon{font-size:1.3rem}.shuffle-text{font-size:.9rem}.card-count{font-size:.8rem}}.container[data-astro-cid-cezvtq5a]{max-width:1000px;margin:0 auto;padding:20px}.info[data-astro-cid-cezvtq5a]{margin-top:40px;padding:30px;background:#f8fafc;border-radius:12px;border-left:4px solid #4299e1}.info[data-astro-cid-cezvtq5a] h2[data-astro-cid-cezvtq5a]{color:#2d3748;margin-top:0}.info[data-astro-cid-cezvtq5a] h3[data-astro-cid-cezvtq5a]{color:#2d3748;margin-top:25px}.info[data-astro-cid-cezvtq5a] ul[data-astro-cid-cezvtq5a]{line-height:1.6;color:#4a5568}.info[data-astro-cid-cezvtq5a] li[data-astro-cid-cezvtq5a]{margin-bottom:8px}kbd[data-astro-cid-cezvtq5a]{background:#e2e8f0;border:1px solid #cbd5e0;border-radius:4px;padding:2px 6px;font-family:monospace;font-size:.85rem;color:#2d3748}.note[data-astro-cid-cezvtq5a]{background:#fef5e7;border:1px solid #f6d55c;border-radius:8px;padding:15px;margin-top:20px;color:#744210}