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16px}.course-grid{grid-template-columns:1fr}.course-card{padding:20px}.course-sidebar{transform:translate(-100%)}.course-sidebar.open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;inset:0;background:#0006;z-index:15;opacity:0;pointer-events:none;transition:opacity .3s ease}.sidebar-overlay.open{opacity:1;pointer-events:auto}.course-main{margin-left:0}.mobile-menu-btn{display:flex}.course-topbar{padding:12px 16px;gap:12px}.course-content{padding:24px 16px 80px}.login-card{padding:32px 24px}.step-nav{flex-direction:column;gap:12px}.btn-nav{width:100%;justify-content:center}}