:root{--color-primary:196, 100%, 47%;--color-primary-hover:196, 100%, 38%;--color-primary-light:196, 100%, 95%;--color-dark:228, 23%, 9%;--color-dark-muted:233, 16%, 14%;--color-dark-light:228, 23%, 15%;--color-success:142, 71%, 45%;--color-success-light:142, 70%, 95%;--color-warning:38, 92%, 50%;--color-error:0, 84%, 60%;--color-bg:220, 10%, 96%;--color-bg-card:0, 0%, 100%;--color-border:220, 10%, 90%;--font-display:"Outfit", "Inter", -apple-system, sans-serif;--font-body:"Inter", -apple-system, sans-serif;--shadow-sm:0 1px 2px 0 #00aeef08;--shadow-md:0 4px 6px -1px #00aeef0d, 0 2px 4px -2px #00aeef05;--shadow-lg:0 10px 15px -3px #00aeef0a, 0 4px 6px -4px #00aeef05;--shadow-xl:0 20px 25px -5px #00aeef0f, 0 8px 10px -6px #00aeef05;--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--radius-full:9999px;--transition-normal:all .25s cubic-bezier(.4, 0, .2, 1);--transition-spring:all .4s cubic-bezier(.34, 1.56, .64, 1)}.dark-glass{-webkit-backdrop-filter:blur(12px)!important;background-color:#0f172ad1!important;border:1px solid #ffffff14!important}.light-glass{-webkit-backdrop-filter:blur(12px)!important;background-color:#fffc!important;border:1px solid #f1f5f9cc!important}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:hsl(var(--color-bg));color:hsl(var(--color-dark));-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;line-height:1.6;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:600;line-height:1.25}button,input,select{font-family:inherit;font-size:inherit}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-content{flex-direction:column;flex:1;gap:2rem;width:100%;max-width:1200px;margin:0 auto;padding:2rem 1.5rem;display:flex}.premium-header{z-index:100;-webkit-backdrop-filter:blur(16px);border-bottom:1px solid hsl(var(--color-border));transition:var(--transition-normal);background-color:#ffffffd9;position:sticky;top:0}.header-container{justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;padding:.85rem 1.5rem;display:flex}.nav-tabs{background-color:hsl(var(--color-bg));border:1px solid hsl(var(--color-border));border-radius:var(--radius-full);align-items:center;gap:.25rem;padding:.25rem;display:flex}.nav-tab{border-radius:var(--radius-full);color:hsl(var(--color-dark-muted));cursor:pointer;transition:var(--transition-normal);background:0 0;border:none;align-items:center;gap:.5rem;padding:.5rem 1.25rem;font-size:.9rem;font-weight:500;text-decoration:none;display:flex}.nav-tab:hover{color:hsl(var(--color-dark))}.nav-tab.active{background-color:hsl(var(--color-primary));color:#fff;box-shadow:var(--shadow-sm)}.brand-logo{color:hsl(var(--color-dark));align-items:center;gap:.75rem;text-decoration:none;display:flex}.logo-icon{background:linear-gradient(135deg, hsl(var(--color-primary)), #00c6ff);border-radius:var(--radius-sm);color:#fff;width:2.2rem;height:2.2rem;font-family:var(--font-display);justify-content:center;align-items:center;font-size:1.2rem;font-weight:800;display:flex;box-shadow:0 4px 10px #0891b24d}.brand-text{font-family:var(--font-display);letter-spacing:-.025em;background:linear-gradient(135deg, hsl(var(--color-dark)) 40%, hsl(var(--color-primary)));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.3rem;font-weight:700}.profile-menu{position:relative}.avatar-btn{cursor:pointer;border-radius:var(--radius-full);transition:var(--transition-normal);background:0 0;border:2px solid #0000;align-items:center;gap:.5rem;padding:.2rem;display:flex}.avatar-btn:hover{border-color:hsl(var(--color-primary))}.avatar-img{border-radius:var(--radius-full);object-fit:cover;background-color:hsl(var(--color-border));width:2.25rem;height:2.25rem}.dropdown-menu{background-color:hsl(var(--color-bg-card));border:1px solid hsl(var(--color-border));border-radius:var(--radius-md);box-shadow:var(--shadow-xl);opacity:0;visibility:hidden;min-width:200px;transition:var(--transition-spring);flex-direction:column;gap:.25rem;padding:.5rem;display:flex;position:absolute;top:110%;right:0;transform:translateY(10px)}.profile-menu.open .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-item{color:hsl(var(--color-dark-muted));border-radius:var(--radius-sm);text-align:left;cursor:pointer;transition:var(--transition-normal);background:0 0;border:none;align-items:center;gap:.65rem;padding:.65rem .85rem;font-size:.9rem;display:flex}.dropdown-item:hover{background-color:hsl(var(--color-primary-light));color:hsl(var(--color-primary-hover))}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s cubic-bezier(.16,1,.3,1) forwards fadeIn}.responsive-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem;width:100%;display:grid}.login-input:hover{background-color:#f1f5f9!important;border-color:#cbd5e1!important}.login-input:focus{transform:translateY(-1px);border-color:hsl(var(--color-primary))!important;background-color:#fff!important;box-shadow:0 0 0 4px #0891b226!important}.login-submit-btn:hover{transform:translateY(-1px);background-color:hsl(var(--color-primary-hover))!important;box-shadow:0 6px 18px #0891b259!important}.login-submit-btn:active{transform:translateY(0)}.split-login-container{background-color:#fff;border-radius:24px;grid-template-columns:1.1fr 1.2fr;width:100%;max-width:960px;animation:.6s cubic-bezier(.16,1,.3,1) forwards fadeIn;display:grid;overflow:hidden;box-shadow:0 25px 50px -12px #00000040}@media (width<=768px){.split-login-container{grid-template-columns:1fr;max-width:450px}.login-left-panel{display:none!important}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.math-grid{background-color:#fdfdfd;background-image:linear-gradient(#00aeef09 1px,#0000 1px),linear-gradient(90deg,#00aeef09 1px,#0000 1px);background-size:24px 24px}