.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:0.6rem 1.1rem;border:1px solid transparent;border-radius:var(--radius-sm);background:var(--bg-elevated);color:var(--text);border-color:var(--border);font-weight:600;cursor:pointer;transition:background 0.15s,border-color 0.15s,transform 0.05s}.btn:hover{border-color:var(--color-primary)}.btn:active{transform:translateY(1px)}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.btn-primary{background:var(--color-primary);border-color:var(--color-primary);color:var(--text-on-primary)}.btn-primary:hover{background:var(--color-primary-dark);border-color:var(--color-primary-dark)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--bg-sunken);border-color:var(--border)}.btn-danger{background:transparent;border-color:var(--border);color:#DC2626}.btn-danger:hover{background:#DC2626;border-color:#DC2626;color:var(--brand-white)}.btn-sm{padding:0.35rem 0.7rem;font-size:0.85rem}.btn-block{width:100%}