:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--gradient-primary: linear-gradient(100deg, #a8c0ff 0%, #c2b7ff 100%);--gradient-primary-hover: linear-gradient(100deg, #d4b3ff 0%, #f7b1d1 100%);--shadow-sm: 0 1px 2px 0 rgb(17 19 28 / .05);--shadow-md: 0 4px 6px -1px rgb(17 19 28 / .08), 0 2px 4px -2px rgb(17 19 28 / .08);--shadow-lg: 0 10px 15px -3px rgb(17 19 28 / .1), 0 4px 6px -4px rgb(17 19 28 / .1);--border-radius: .75rem;--transition-speed: .2s;--aurora-blur: 80px}[data-theme=light]{--color-primary: #7c3aed;--color-primary-text: #ffffff;--color-text-header: #1f2937;--color-text-body: #374151;--color-text-muted: #6b7280;--color-background: #f7f8fc;--color-surface: #ffffff;--color-border: #e5e7eb;--glass-bg: rgba(247, 248, 252, .6);--glass-border: rgba(229, 231, 235, .7)}[data-theme=dark]{--color-primary: #a78bfa;--color-primary-text: #111115;--color-text-header: #f9fafb;--color-text-body: #e5e7eb;--color-text-muted: #9ca3af;--color-background: radial-gradient(circle, #16171d 0%, #111115 100%);--color-surface: #1f2029;--color-border: #374151;--glass-bg: rgba(31, 32, 41, .5);--glass-border: rgba(55, 65, 81, .7)}*,*:before,*:after{box-sizing:border-box}html{background:var(--color-background)}body{margin:0;color:var(--color-text-body);background:var(--color-background);transition:background var(--transition-speed),color var(--transition-speed);overflow-y:auto}#app{position:relative;z-index:10;width:100%;min-height:100vh;display:flex;flex-direction:column}.content-wrapper{animation:fadeIn 1s ease-in-out;flex-grow:1;display:flex;flex-direction:column}@keyframes 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var(--transition-speed)}.button:hover:not(:disabled){transform:scale(1.03);box-shadow:var(--shadow-md)}.button:active:not(:disabled){transform:scale(.98)}.button-secondary{background-color:var(--glass-bg);color:var(--color-text-header);border-color:var(--glass-border)}.button-secondary:hover:not(:disabled){border-color:var(--color-primary)}.button-link{background:none;border:none;padding:0;color:var(--color-primary)}.button-link:hover{text-decoration:underline;transform:none;box-shadow:none}.button-revise{background-color:color-mix(in srgb,var(--color-primary) 85%,black);color:var(--color-primary-text)}.button-delete{background-color:color-mix(in srgb,#ef4444 15%,transparent);color:#ef4444}.button-icon{background:none;border:none;padding:.5rem;color:var(--color-text-muted);cursor:pointer;border-radius:50%;transition:all var(--transition-speed);display:inline-flex}.button-icon1{background:none;border:none;padding:.5rem;color:var(--color-text-muted);cursor:pointer;border-radius:50%;transition:all var(--transition-speed);position:absolute;left:1rem;top:8.5rem}.button-icon:hover{background-color:var(--glass-bg);color:var(--color-text-body)}.button-srs{font-size:.9rem;font-weight:600;border-radius:var(--border-radius);border:none;line-height:1.3;margin-top:1em;padding:.6rem 1rem;transition:background-color var(--transition-speed) ease}.button-srs .interval-time{display:block;font-size:.75rem;font-weight:400;opacity:.7}.srs-again{background-color:color-mix(in srgb,#ef4444 20%,transparent);color:#ef4444}.srs-again:hover{background-color:color-mix(in srgb,#ef4444 30%,transparent)}.srs-hard{background-color:color-mix(in srgb,#f97316 20%,transparent);color:#f97316}.srs-hard:hover{background-color:color-mix(in srgb,#f97316 30%,transparent)}.srs-good{background-color:color-mix(in srgb,#22c55e 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i{width:48px;height:48px;color:var(--color-text-muted);margin-bottom:1rem}.empty-state h3{margin-bottom:.5rem;color:var(--color-text-header)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0009;display:flex;align-items:flex-start;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);padding:5vh 1rem;overflow-y:auto}.modal-overlay.is-visible{opacity:1;visibility:visible}.modal-content{background-color:var(--color-surface);padding:2rem;border-radius:var(--border-radius);width:90%;max-width:600px;box-shadow:var(--shadow-lg);transform:translateY(20px);transition:transform .3s;border:1px solid var(--glass-border);max-height:90vh;overflow-y:auto}.modal-overlay.is-visible .modal-content{transform:translateY(0)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.modal-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:1.5rem}.confirm-modal-content{text-align:center}.confirm-modal-content i{width:48px;height:48px;color:#ef4444;margin-bottom:1rem}.confirm-modal-content h3{margin-bottom:.5rem;color:var(--color-text-header)}.confirm-modal-content p{color:var(--color-text-muted);margin-top:0}.confirm-modal-actions{display:flex;justify-content:center;gap:1rem;margin-top:1.5rem}.tabs-container{display:flex;border-bottom:1px solid var(--glass-border);margin-bottom:1.5rem}.tab-button{padding:.75rem 1rem;font-weight:600;background:none;border:none;cursor:pointer;color:var(--color-text-muted);border-bottom:2px solid transparent;transform:translateY(1px);transition:color var(--transition-speed),border-color var(--transition-speed)}.tab-button.is-active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.error-message{color:#ef4444;background-color:color-mix(in srgb,#ef4444 20%,transparent);border:1px solid #ef4444;padding:.75rem 1rem;border-radius:.5rem;font-size:.9rem;font-weight:500;margin-bottom:1rem;text-align:center;display:none}.auth-links{display:flex;flex-direction:column;align-items:center;gap:.5rem;margin-top:1.5rem;font-size:.9rem}.auth-links p{margin:0;color:var(--color-text-muted)}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0009;display:flex;align-items:center;justify-content:center;z-index:2000;opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s}.loading-overlay.is-visible{opacity:1;visibility:visible}.loader{perspective:120px}.loader-card{width:80px;height:120px;background:var(--gradient-primary);border:2px solid var(--color-surface);border-radius:var(--border-radius);animation:flip 1.2s infinite ease-in-out}@keyframes flip{0%{transform:rotateY(0)}50%{transform:rotateY(180deg)}to{transform:rotateY(360deg)}}.toastify{font-family:inherit;border-radius:.5rem;box-shadow:var(--shadow-lg);font-weight:500;opacity:.95}.toast-success{background:linear-gradient(to right,#22c55e,#16a34a)}.toast-error{background:linear-gradient(to right,#ef4444,#dc2626)}.toast-info{background:linear-gradient(to right,#3b82f6,#2563eb)}.card-loader-container{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.card-loader{width:50px;height:50px;border:5px solid var(--glass-border);border-bottom-color:var(--color-primary);border-radius:50%;display:inline-block;box-sizing:border-box;animation:rotation 1s linear infinite}@keyframes rotation{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.cloze-text{line-height:1.8}.cloze-button{display:inline-flex;align-items:baseline;background-color:color-mix(in srgb,var(--color-primary) 80%,black);color:var(--color-primary-text);padding:.1em .6em;border-radius:.5rem;font-weight:600;cursor:pointer;border:none;font:inherit;transition:all var(--transition-speed)}.cloze-button:hover{background-color:var(--color-primary-hover)}.cloze-button.is-revealed{background-color:transparent;color:var(--color-primary);font-weight:700;cursor:default;padding:0 .2em}.katex{font-size:1.1rem}.katex-display{display:inline-block}.tier-selector{padding-top:1.5rem;border-top:1px solid var(--glass-border)}.tier-selector .form-label{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}.tier-selector .form-label i{color:var(--color-primary)}.fully-custom-select{position:relative;height:42px}.fully-custom-select 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