.flashcard{width:600px;height:400px;perspective:1000px;cursor:pointer;position:relative;font-family:var(--font-sans)}.flashcard-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s;transform-style:preserve-3d;box-shadow:0 8px 16px #0000001a;border-radius:16px}.flashcard.flipped .flashcard-inner{transform:rotateY(-180deg)}.flashcard.spinning .flashcard-inner{transition:transform .3s;transform:rotateY(var(--rotation-angle))}.flashcard-front,.flashcard-back{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem;border-radius:16px;background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);backface-visibility:hidden}.card-content{width:100%;height:100%;overflow-y:auto;display:flex;flex-direction:column;align-items:center;padding:1rem 1rem 2rem;position:relative;max-height:100%}.card-content p{font-size:1.4rem;line-height:1.6;margin:0;max-width:90%;text-align:center;overflow-wrap:break-word;color:var(--text-color);letter-spacing:-.01em}.flashcard-front p,.flashcard-back p{font-size:1.5rem;line-height:1.6;margin:0;max-width:90%;text-align:center;overflow-y:auto;max-height:100%;padding:1rem}.flashcard-back{transform:rotateY(180deg);background:#f8f9fa}.flip-hint{position:absolute;bottom:0;left:0;right:0;text-align:center;font-size:.9rem;color:#94a3b8;opacity:.8;padding:.5rem;background:linear-gradient(transparent,#fff)}.flashcard:hover .flip-hint{opacity:1}.latex-content{width:100%;max-width:90%;font-size:1.4rem;line-height:1.6;text-align:center;overflow-wrap:break-word;color:var(--text-color);padding:1rem}.latex-content .katex-display{margin:1em 0;overflow-x:auto;overflow-y:hidden;padding:.5em 0;text-align:center}.latex-content .katex{font-size:1.1em;text-align:center}.latex-content br{display:block;margin:.5em 0;content:""}.card-content::-webkit-scrollbar{width:6px}.card-content::-webkit-scrollbar-track{background:transparent}.card-content::-webkit-scrollbar-thumb{background-color:#0003;border-radius:3px}.card-content{scrollbar-width:thin;scrollbar-color:rgba(0,0,0,.2) transparent;white-space:pre-wrap}.flashcard-inner.instant{transition:none}.generate-form{width:100%;max-width:500px;display:flex;flex-direction:column;gap:1.5rem;padding:2rem;background:#fff;border-radius:15px;box-shadow:0 4px 6px #0000001a}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-weight:600;color:#333;font-size:.9rem}.form-group input{padding:.75rem;border:2px solid #eee;border-radius:8px;font-size:1rem;transition:border-color .2s}.form-group input:focus{outline:none;border-color:var(--primary-color)}.form-group input:disabled{background:#f5f5f5;cursor:not-allowed}.generate-button{padding:1rem;background:var(--primary-color);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.generate-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}.generate-button:disabled{background:#ccc;cursor:not-allowed}.generate-button.loading{position:relative;cursor:not-allowed}.generate-button.loading:after{content:"";position:absolute;width:1rem;height:1rem;border:2px solid #fff;border-radius:50%;border-top-color:transparent;animation:spin 1s linear infinite;right:1rem;top:50%;transform:translateY(-50%)}@keyframes spin{to{transform:translateY(-50%) rotate(360deg)}}.flashcard-container{display:flex;flex-direction:column;align-items:center;gap:3rem;padding:2rem 0;width:100%;max-width:1200px;margin:0 auto}.flashcard-viewer{display:flex;align-items:center;justify-content:center;gap:2rem;margin:2rem 0;min-height:450px}.nav-button{position:absolute;padding:1rem;font-size:2rem;border:none;background:#ffffffe6;color:#4b5563;border-radius:12px;cursor:pointer;transition:all .2s ease;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);width:3.5rem;height:3.5rem;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px #0000001a;z-index:10}.nav-button:first-child{left:0}.nav-button:last-child{right:0}.nav-button:hover:not(:disabled){background:#fff;transform:scale(1.1)}.nav-button:disabled{opacity:.5;cursor:not-allowed}.card-counter{font-size:1rem;color:#64748b;font-weight:500;text-align:center;width:100%;margin-top:1rem}.empty-state{text-align:center;color:#64748b;font-size:1.1rem;padding:3rem;background:#fff;border-radius:16px;width:100%;max-width:500px;box-shadow:0 4px 6px #0000001a}.empty-state-subtitle{font-size:.9rem;margin-top:.5rem;color:#94a3b8}.error-message{color:#dc2626;background:#fee2e2;padding:1rem;border-radius:8px;margin-bottom:1rem;text-align:center;width:100%;max-width:500px}:root{--primary-color: #4f46e5;--background-color: #f8fafc;--text-color: #1e293b;--font-sans: "Outfit", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "Cal Sans", "Outfit", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(300deg,#84fab0,#8fd3f4,#66a6ff,#62fbd7,#67e792);background-attachment:fixed;background-size:300% 300%;animation:gradientShift 20s ease infinite;color:var(--text-color);font-family:var(--font-sans)}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.app-container{position:relative;min-height:100vh}.app-container:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background-image:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%234f46e5' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none;opacity:.02}.welcome{text-align:center;margin-bottom:2rem}.welcome h2{font-family:var(--font-display);font-size:3.5rem;font-weight:700;background:linear-gradient(45deg,#2c5364,#203a43,#0f2027);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1.5rem;letter-spacing:-.02em}.welcome p{font-family:var(--font-sans);font-size:1.25rem;color:#1a365d;margin-bottom:2rem;line-height:1.6;font-weight:500}.keyboard-shortcuts{display:flex;gap:2rem;font-size:.9rem;color:#94a3b8;font-family:var(--font-mono);margin:0 auto;width:fit-content}.keyboard-shortcuts span{padding:.5rem 1rem;background:#fffc;border-radius:8px;box-shadow:0 2px 4px #0000000d;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);min-width:120px;text-align:center}.math-content{font-family:var(--font-sans);font-size:1.2rem;line-height:1.6;font-weight:500;color:var(--text-color);padding:1rem;max-width:100%;overflow-x:auto}.MathJax{font-size:1.2em!important}.MathJax_Display{margin:.5em 0!important;max-width:100%;overflow-x:auto}