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:root{--bg-primary:#f0f2ff;--bg-secondary:#fff;--bg-card:#fff;--bg-hover:#e8ebff;--bg-input:#f5f6fa;--text-primary:#0d0f1a;--text-secondary:#5a5f7a;--text-muted:#9ca3af;--text-inverse:#fff;--accent-primary:#6366f1;--accent-secondary:#8b5cf6;--accent-gradient:linear-gradient(135deg, #6366f1, #8b5cf6);--accent-glow:#6366f11f;--border:#e2e5f5;--border-focus:#6366f1;--success:#10b981;--success-bg:#d1fae5;--error:#ef4444;--error-bg:#fee2e2;--warning:#f59e0b;--warning-bg:#fef3c7;--shadow-sm:0 1px 3px #6366f10f, 0 1px 2px #0000000a;--shadow-md:0 4px 16px #6366f11a, 0 2px 6px #0000000a;--shadow-lg:0 10px 40px #6366f11f, 0 4px 12px #0000000d;--shadow-accent:0 4px 20px #6366f14d;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition:all .2s ease;--transition-slow:all .35s ease;--navbar-height:64px}[data-theme=dark]{--bg-primary:#0a0b14;--bg-secondary:#111827;--bg-card:#161b2e;--bg-hover:#1e2540;--bg-input:#1a2035;--text-primary:#f0f2ff;--text-secondary:#9ca3c9;--text-muted:#6b7280;--text-inverse:#0d0f1a;--accent-primary:#818cf8;--accent-secondary:#a78bfa;--accent-gradient:linear-gradient(135deg, #818cf8, #a78bfa);--accent-glow:#818cf833;--border:#1e2843;--border-focus:#818cf8;--success-bg:#10b98126;--error-bg:#ef444426;--warning-bg:#f59e0b26;--shadow-sm:0 1px 3px #0000004d, 0 1px 2px #0003;--shadow-md:0 4px 16px #0006, 0 2px 6px #0003;--shadow-lg:0 10px 40px #00000080, 0 4px 12px #0000004d;--shadow-accent:0 4px 20px #818cf84d}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-inter), -apple-system, BlinkMacSystemFont, sans-serif;background-color:var(--bg-primary);color:var(--text-primary);background-image:radial-gradient(at 20%,#6366f10d 0%,#0000 60%),radial-gradient(at 80% 10%,#8b5cf60d 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28px;font-size:16px}.btn-block{width:100%}.form-group{flex-direction:column;gap:6px;display:flex}.form-label{color:var(--text-secondary);letter-spacing:.02em;text-transform:uppercase;font-size:13px;font-weight:600}.form-input{background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-md);width:100%;font-size:15px;font-family:var(--font-inter), sans-serif;color:var(--text-primary);transition:var(--transition);outline:none;padding:12px 16px}.form-input:focus{border-color:var(--border-focus);background:var(--bg-secondary);box-shadow:0 0 0 3px var(--accent-glow)}.form-input::placeholder{color:var(--text-muted)}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%236b7280'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;background-size:20px;padding-right:40px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:var(--transition)}.card-hover:hover{box-shadow:var(--shadow-md);border-color:var(--accent-primary);transform:translateY(-2px)}.badge{border-radius:var(--radius-full);align-items:center;padding:3px 10px;font-size:12px;font-weight:600;display:inline-flex}.badge-primary{background:var(--accent-glow);color:var(--accent-primary)}.badge-success{background:var(--success-bg);color:var(--success)}.badge-error{background:var(--error-bg);color:var(--error)}.badge-warning{background:var(--warning-bg);color:var(--warning)}.container{max-width:1100px;margin:0 auto;padding:0 20px}.page-wrapper{padding-top:calc(var(--navbar-height) + 32px);min-height:100vh}.app-shell{flex-direction:column;min-height:100vh;display:flex}.app-main{flex:1}.site-footer{border-top:1px solid var(--border);background:color-mix(in srgb, var(--bg-secondary) 92%, transparent);padding:16px 0 20px}.site-footer-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:linear-gradient(180deg, color-mix(in srgb, var(--accent-glow) 40%, transparent), transparent 45%), var(--bg-card);box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;gap:18px;padding:14px 16px;display:flex;position:relative;overflow:hidden}.site-footer-card:before{content:"";background:var(--accent-gradient);opacity:.9;height:2px;position:absolute;top:0;left:0;right:0}.site-footer-brand{align-items:center;gap:10px;min-width:0;display:flex}.site-footer-dot{background:var(--accent-gradient);color:#fff;width:30px;height:30px;box-shadow:var(--shadow-accent);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;display:inline-flex}.site-footer-title{font-family:var(--font-space-grotesk), sans-serif;letter-spacing:.02em;color:var(--text-primary);font-size:14px;font-weight:700;line-height:1.2}.site-footer-subtitle{color:var(--text-muted);margin-top:2px;font-size:12px;line-height:1.2}.site-footer-meta{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;display:flex}.site-footer-copy{color:var(--text-secondary);font-size:13px}.site-footer-separator{color:var(--text-muted);font-size:12px}.site-footer-link{color:var(--accent-primary);font-weight:600;text-decoration:none}.site-footer-link:hover{text-decoration:underline}.site-footer-new{border-top:1px solid var(--border);background:linear-gradient(180deg, var(--bg-secondary) 0%, color-mix(in srgb, var(--bg-secondary) 95%, var(--accent-primary) 5%) 100%);margin-top:80px;padding:60px 0 20px;position:relative;overflow:hidden}.site-footer-new:before{content:"";background:linear-gradient(90deg, transparent, var(--accent-primary), 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(max-width:768px){.footer-top{grid-template-columns:1fr;gap:40px}}.footer-brand-section{flex-direction:column;align-items:flex-start;gap:32px;display:flex}.footer-brand{align-items:flex-start;gap:16px;display:flex}.footer-logo{border-radius:var(--radius-md);background:var(--accent-gradient);width:48px;height:48px;box-shadow:var(--shadow-accent);flex-shrink:0;justify-content:center;align-items:center;display:flex;position:relative}.footer-logo:after{content:"";border-radius:var(--radius-md);background:var(--accent-gradient);opacity:.2;filter:blur(8px);z-index:-1;position:absolute;inset:-2px}.footer-logo-icon{color:#fff;justify-content:center;align-items:center;font-size:24px;display:flex}.footer-brand-title{font-family:var(--font-space-grotesk), sans-serif;color:var(--text-primary);letter-spacing:-.02em;margin:0;font-size:20px;font-weight:700}.footer-brand-desc{color:var(--text-secondary);max-width:280px;margin:4px 0 0;font-size:13px;line-height:1.5}.footer-social{flex-wrap:wrap;gap:12px;display:flex}.footer-social-link{border-radius:var(--radius-md);background:color-mix(in srgb, var(--accent-primary) 10%, transparent);border:1px solid color-mix(in srgb, var(--accent-primary) 20%, transparent);width:40px;height:40px;color:var(--accent-primary);transition:var(--transition);justify-content:center;align-items:center;font-size:18px;text-decoration:none;display:flex}.footer-social-icon{justify-content:center;align-items:center;display:inline-flex}.footer-social-link:hover{background:var(--accent-gradient);color:#fff;border-color:var(--accent-primary);transform:translateY(-2px)}.footer-social-link:active{transform:translateY(0)}.footer-links-grid{grid-template-columns:repeat(3,1fr);gap:40px;display:grid}@media (max-width:768px){.footer-links-grid{grid-template-columns:repeat(2,1fr);gap:32px}}@media 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auto;align-items:center;gap:32px;padding-bottom:20px;display:grid}@media (max-width:640px){.footer-bottom{grid-template-columns:1fr;gap:24px}}.footer-copyright,.footer-credits{color:var(--text-secondary);margin:0;font-size:12px;line-height:1.5}.footer-copyright-link,.footer-credits-link{color:var(--accent-primary);transition:var(--transition);font-weight:600;text-decoration:none}.footer-copyright-link:hover,.footer-credits-link:hover{color:var(--accent-secondary);text-decoration:underline}.footer-heart{color:#ef4444;align-items:center;margin:0 2px;animation:1.2s ease-in-out infinite heartbeat;display:inline-flex}@keyframes heartbeat{0%,to{transform:scale(1)}25%{transform:scale(1.2)}}.scroll-to-top{z-index:99;background:var(--accent-gradient);color:#fff;cursor:pointer;width:48px;height:48px;transition:var(--transition);box-shadow:var(--shadow-accent);border:none;border-radius:50%;justify-content:center;align-items:center;font-size:20px;font-weight:700;animation:.3s ease-out 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var(--border);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);z-index:1;padding:40px;position:relative}.auth-logo{align-items:center;gap:12px;margin-bottom:32px;display:flex}.auth-logo-icon{background:var(--accent-gradient);border-radius:var(--radius-md);justify-content:center;align-items:center;width:48px;height:48px;font-size:24px;display:flex}.auth-title{margin-bottom:6px;font-size:26px}.auth-subtitle{color:var(--text-secondary);margin-bottom:28px;font-size:14px}.auth-form-fields{flex-direction:column;gap:16px;margin-bottom:24px;display:flex}.auth-inline-actions{align-items:center;gap:10px;display:flex}.auth-inline-actions .form-input{flex:1}.auth-inline-head{justify-content:space-between;align-items:center;gap:10px;display:flex}.auth-small-link{font-size:13px;font-weight:600}.auth-divider{text-align:center;color:var(--text-muted);margin:16px 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2px;font-size:18px;line-height:1}.toast-close:hover{color:var(--text-primary)}@media (max-width:480px){.toast-container{bottom:16px;left:12px;right:12px}.toast{max-width:100%}}.confirm-overlay{z-index:10000;background:#00000080;justify-content:center;align-items:center;padding:16px;animation:.15s fadeIn;display:flex;position:fixed;inset:0}.confirm-modal{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:400px;box-shadow:var(--shadow-lg);padding:28px 24px;animation:.2s scaleIn}.confirm-message{color:var(--text-primary);margin-bottom:20px;font-size:15px;line-height:1.6}.confirm-actions{justify-content:flex-end;gap:10px;display:flex}@media (max-width:480px){.question-card{border-radius:var(--radius-lg);padding:16px}.question-text{margin-bottom:18px;font-size:15px}.option-btn{gap:8px;padding:11px 12px;font-size:14px}.option-letter{flex-shrink:0;width:26px;height:26px;font-size:12px}.quiz-actions{padding:0}.quiz-actions .btn{width:100%;padding:14px;font-size:15px}.explanation-box{padding:12px;font-size:13px}.quiz-progress-bar{margin-bottom:20px}}.skip-link{z-index:10000;background:var(--accent-primary);color:#fff;border-radius:0 0 var(--radius-md) var(--radius-md);padding:10px 20px;font-size:14px;font-weight:600;text-decoration:none;transition:top .15s;position:absolute;top:-100%;left:16px}.skip-link:focus{outline-offset:2px;outline:2px solid #fff;top:0}
.flashcard-container{perspective:1000px;cursor:pointer}.flashcard-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.23,1,.32,1);position:relative}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-face{backface-visibility:hidden;border-radius:var(--radius-xl);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:32px;display:flex;position:absolute;inset:0}.flashcard-front{background:var(--bg-card);border:1.5px solid var(--border);box-shadow:var(--shadow-md)}.flashcard-back{background:var(--accent-gradient);box-shadow:var(--shadow-accent);transform:rotateY(180deg)}.tools-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;display:grid}.tool-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);color:inherit;transition:var(--transition);cursor:pointer;flex-direction:column;gap:12px;padding:24px;text-decoration:none;display:flex}.tool-card:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-md);transform:translateY(-3px)}.tool-icon{border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;width:56px;height:56px;font-size:26px;display:flex;box-shadow:0 4px 14px #00000026}.schedule-day{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:var(--transition);padding:16px 20px}.schedule-day:hover{box-shadow:var(--shadow-sm)}input[type=range]{appearance:none;border-radius:var(--radius-full);background:var(--border);outline:none;height:6px;padding:0}input[type=range]::-webkit-slider-thumb{appearance:none;background:var(--accent-primary);cursor:pointer;width:20px;height:20px;transition:var(--transition);border-radius:50%;box-shadow:0 2px 8px #6366f166}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2)}.count-grid-4{grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.tutor-mode-btn{border-radius:var(--radius-full);border:1.5px solid var(--border);background:var(--bg-card);cursor:pointer;color:var(--text-secondary);transition:var(--transition);align-items:center;gap:8px;padding:8px 16px;font-family:Inter,sans-serif;font-size:13px;font-weight:600;display:flex}