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:root{--primary:#ff8c00;--primary-hover:#e07b00;--primary-light:#fff7ed;--secondary:#00a3e0;--secondary-dark:#0077a3;--secondary-light:#f0f9ff;--bg-body:#f3f4f6;--bg-surface:#fff;--text-main:#111827;--text-secondary:#4b5563;--text-muted:#9ca3af;--border-color:#e5e7eb;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d;--radius-md:.5rem;--radius-lg:.75rem}*{box-sizing:border-box}body{background-color:var(--bg-body);color:var(--text-main);-webkit-font-smoothing:antialiased;margin:0;padding:0;font-family:Inter,sans-serif}a{color:inherit;text-decoration:none}button{font-family:inherit}.flex-center{justify-content:center;align-items:center;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.flex-col{flex-direction:column;display:flex}.container-xl{max-width:1280px;margin:0 auto;padding:0 1.5rem}.panel{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.input-group{margin-bottom:1.25rem}.input-label{color:var(--text-secondary);margin-bottom:.5rem;font-size:.875rem;font-weight:500;display:block}.form-input{border-radius:var(--radius-md);border:1px solid var(--border-color);width:100%;color:var(--text-main);background:#fff;padding:.75rem 1rem;font-size:.95rem;transition:border-color .15s,box-shadow .15s}.form-input:focus{border-color:var(--secondary);box-shadow:0 0 0 3px var(--secondary-light);outline:none}.btn{border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;padding:.75rem 1.5rem;font-size:.95rem;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px)}.btn-secondary{border:1px solid var(--border-color);color:var(--text-main);background-color:#fff}.btn-secondary:hover{background-color:#f9fafb;border-color:#d1d5db}.admin-layout{min-height:100vh;display:flex}.sidebar{color:#fff;background:#111827;flex-direction:column;flex-shrink:0;width:260px;display:flex}.sidebar-link{color:#9ca3af;align-items:center;gap:.75rem;padding:.875rem 1.5rem;font-size:.95rem;transition:all .2s;display:flex}.sidebar-link:hover,.sidebar-link.active{color:#fff;background:#1f2937}.main-content{flex-direction:column;flex:1;min-width:0;display:flex}@keyframes fade-in-up{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-enter{animation:.5s ease-out forwards fade-in-up}.lesson-card:hover{transform:translateY(-2px);box-shadow:0 4px 6px -1px #0000001a;border-left-color:var(--primary)!important}