.btn{justify-content:center;align-items:center;gap:var(--space-sm);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:1px solid #0000;font-family:inherit;font-weight:500;display:inline-flex}.btn-sm{padding:6px 12px;font-size:.85rem}.btn-md{padding:10px 20px;font-size:.95rem}.btn-lg{padding:14px 28px;font-size:1.05rem}.btn-primary{background:var(--brand-primary);color:#fff;font-weight:600}.btn-primary:hover{filter:brightness(1.1);box-shadow:0 4px 20px #0000002e}.btn-primary:active{filter:brightness(.92);box-shadow:none;transform:scale(.98)}.btn-outline{border-color:var(--glass-border);color:var(--text-primary);background:0 0}.btn-outline:hover{background:var(--glass-highlight);border-color:var(--text-secondary)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--glass-highlight);color:var(--text-primary)}.btn-secondary{background:var(--bg-main);color:var(--text-primary);border-color:#00000021}.btn-secondary:hover{background:var(--border);border-color:#00000038}.btn-secondary:active{transform:scale(.98)}body.dark-theme .btn-secondary{background:#ffffff0f;border-color:#ffffff1f}body.dark-theme .btn-secondary:hover{background:#ffffff1a;border-color:#fff3}.btn-danger{background:var(--danger);color:#fff;font-weight:600}.btn-danger:hover{filter:brightness(1.08);box-shadow:0 4px 16px #ef444459}.btn:disabled,.btn:disabled:hover,.btn:disabled:active{opacity:.45;cursor:not-allowed;filter:none;box-shadow:none;transform:none}