.lesson-navigation{border-top:1px solid var(--border-color,#2a2b36);justify-content:space-between;align-items:center;gap:1rem;margin-top:4rem;padding-top:2rem;display:flex}.nav-prev,.nav-next{flex:1}.nav-next{justify-content:flex-end;display:flex}.nav-btn{background-color:var(--card-bg,#1a1b26);border:1px solid var(--border-color,#2a2b36);border-radius:12px;align-items:center;gap:1rem;max-width:300px;padding:1rem 1.5rem;text-decoration:none;transition:all .2s;display:flex}.nav-btn:hover{background-color:var(--hover-bg,#ffffff0d);border-color:var(--accent-violet,#a855f7);transform:translateY(-2px)}.nav-text{flex-direction:column;display:flex}.nav-btn-right{text-align:right}.nav-label{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted,#888);margin-bottom:.25rem;font-size:.65rem}.nav-title{color:var(--text-base,#fff);font-size:1rem;font-weight:500}.nav-arrow{color:var(--accent-violet,#a855f7);font-size:1.25rem}