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var(--border-color)}.lesson-nav-btn{font-family:var(--font-sans);font-size:13.5px;font-weight:600;padding:10px 18px;border-radius:var(--radius-md);cursor:pointer;transition:all .15s ease}.lesson-nav-btn:disabled{opacity:.35;cursor:default}.lesson-nav-prev{border:1px solid var(--border-color);background:transparent;color:var(--text-primary)}.lesson-nav-prev:hover:not(:disabled){background-color:var(--hover-bg)}.lesson-nav-next{border:1px solid transparent;background-color:var(--accent-solid);color:var(--accent-solid-contrast)}.lesson-nav-next:hover:not(:disabled){opacity:.9}@media(max-width:600px){.course-sidebar{top:55px;height:calc(100vh - 55px);width:280px!important}.course-layout{margin-top:55px;min-height:calc(100vh - 55px)}.course-main{padding:24px 20px}.lesson-pane{padding:30px 22px}.lesson-title{font-size:1.8rem}}