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var(--border-primary);border-radius:var(--radius-xl);padding:var(--space-8);width:90%;max-width:500px;animation:.3s ease-out scaleIn}.skeleton{background:linear-gradient(90deg,var(--bg-card)25%,var(--bg-card-hover)50%,var(--bg-card)75%);border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s infinite shimmer}.divider{background:var(--border-primary);height:1px;margin:var(--space-6)0}.auth-layout{background:radial-gradient(ellipse at 20% 50%,#2563eb14 0%,transparent 60%),radial-gradient(ellipse at 80% 20%,#2563eb0d 0%,transparent 50%),var(--bg-primary);justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-card{background:var(--bg-card);border:1px solid var(--border-primary);border-radius:var(--radius-xl);padding:var(--space-10);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);width:100%;max-width:440px;box-shadow:var(--shadow-xl)}.auth-card .logo-section{text-align:center;margin-bottom:var(--space-8)}.auth-card .logo-section h1{font-size:var(--fs-2xl);letter-spacing:.1em;background:linear-gradient(135deg,#fff,var(--brand-accent-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800}.auth-card .logo-section p{color:var(--text-secondary);font-size:var(--fs-sm);margin-top:var(--space-2)}.auth-form{gap:var(--space-5);flex-direction:column;display:flex}.google-btn{justify-content:center;align-items:center;gap:var(--space-3);padding:var(--space-3)var(--space-5);color:#333;border-radius:var(--radius-md);font-family:var(--font-sans);font-size:var(--fs-base);cursor:pointer;transition:all var(--transition-fast);background:#fff;border:none;width:100%;font-weight:500;display:flex}.google-btn:hover{background:var(--gray-100);transform:translateY(-1px)}.divider-text{align-items:center;gap:var(--space-4);color:var(--text-tertiary);font-size:var(--fs-sm);display:flex}.divider-text:before,.divider-text:after{content:"";background:var(--border-primary);flex:1;height:1px}.text-highlight{background-color:#2563eb4d;border-radius:2px;padding:1px 2px}@keyframes toast-in{0%{opacity:0;transform:translateY(16px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}.admin-tabs{gap:var(--space-1);margin-bottom:var(--space-6);background:var(--bg-glass);border-radius:var(--radius-lg);padding:var(--space-1);display:flex}.admin-tab{padding:var(--space-2)var(--space-5);color:var(--text-secondary);font-size:var(--fs-sm);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;font-weight:500}.admin-tab.active{background:var(--brand-accent);color:#fff}.admin-tab:hover:not(.active){background:var(--bg-glass-hover);color:var(--text-primary)}@media (max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr!important}.page-wrapper{padding:var(--space-4)!important}.modal{width:95vw!important;max-height:90vh!important}.dash-row{grid-template-columns:1fr!important}table{font-size:var(--fs-xs)}table th,table td{padding:var(--space-2)var(--space-3)}}@media (max-width:480px){.page-header h1{font-size:var(--fs-2xl)}.stat-card{padding:var(--space-3)}.stat-value{font-size:var(--fs-xl)}}@media (max-width:640px){.course-hero{align-items:flex-start!important;gap:var(--space-4)!important;padding:var(--space-5)!important;flex-direction:column!important}.course-hero h1{font-size:var(--fs-2xl)!important}.course-lesson-type{display:none!important}}